python flask在主app.py文件中定义了一个工厂函数create_app(),并且创建列一个app实例,为什么还是会报Failed to find application in module "app"的错误。 5C

python flask在主app.py文件中定义了一个工厂函数create_app(),并且创建列一个app实例,为什么还是会报Failed to find application in module "app"的错误。

工厂函数以及main方法

# --app.py
def create_app():
    app = Flask(__name__)
    app.config.from_object(config)
    return app

if __name__ == '__main__':
    app = create_app()
    app.run()

为什么还是报错:
Error: Failed to find application in module "app". Are you sure it contains a Flask application? Maybe you wrapped it in a WSGI middleware or you are using a factory function.

weixin_44915639
weixin_44915639 请问楼主解决了吗 我遇到了一模一样的问题
3 个月之前 回复

1个回答

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"/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 580, in do_execute 2019-11-17T08:44:42.918950+00:00 app[web.1]: cursor.execute(statement, parameters) 2019-11-17T08:44:42.918952+00:00 app[web.1]: psycopg2.errors.UndefinedTable: relation "question" does not exist 2019-11-17T08:44:42.918955+00:00 app[web.1]: LINE 2: FROM question ORDER BY question.create_time DESC 2019-11-17T08:44:42.918957+00:00 app[web.1]: ^ 2019-11-17T08:44:42.918959+00:00 app[web.1]: 2019-11-17T08:44:42.918961+00:00 app[web.1]: 2019-11-17T08:44:42.918963+00:00 app[web.1]: The above exception was the direct cause of the following exception: 2019-11-17T08:44:42.918965+00:00 app[web.1]: 2019-11-17T08:44:42.918967+00:00 app[web.1]: Traceback (most recent call last): 2019-11-17T08:44:42.918969+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/gunicorn/workers/sync.py", line 134, in handle 2019-11-17T08:44:42.918971+00:00 app[web.1]: self.handle_request(listener, req, client, addr) 2019-11-17T08:44:42.918973+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/gunicorn/workers/sync.py", line 175, in handle_request 2019-11-17T08:44:42.918975+00:00 app[web.1]: respiter = self.wsgi(environ, resp.start_response) 2019-11-17T08:44:42.918977+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2463, in __call__ 2019-11-17T08:44:42.918979+00:00 app[web.1]: return self.wsgi_app(environ, start_response) 2019-11-17T08:44:42.918981+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2449, in wsgi_app 2019-11-17T08:44:42.918983+00:00 app[web.1]: response = self.handle_exception(e) 2019-11-17T08:44:42.918985+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1866, in handle_exception 2019-11-17T08:44:42.918988+00:00 app[web.1]: reraise(exc_type, exc_value, tb) 2019-11-17T08:44:42.918989+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise 2019-11-17T08:44:42.918991+00:00 app[web.1]: raise value 2019-11-17T08:44:42.918994+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2446, in wsgi_app 2019-11-17T08:44:42.918996+00:00 app[web.1]: response = self.full_dispatch_request() 2019-11-17T08:44:42.918998+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1951, in full_dispatch_request 2019-11-17T08:44:42.919000+00:00 app[web.1]: rv = self.handle_user_exception(e) 2019-11-17T08:44:42.919002+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1820, in handle_user_exception 2019-11-17T08:44:42.919004+00:00 app[web.1]: reraise(exc_type, exc_value, tb) 2019-11-17T08:44:42.919006+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise 2019-11-17T08:44:42.919008+00:00 app[web.1]: raise value 2019-11-17T08:44:42.919010+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1949, in full_dispatch_request 2019-11-17T08:44:42.919012+00:00 app[web.1]: rv = self.dispatch_request() 2019-11-17T08:44:42.919014+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1935, in dispatch_request 2019-11-17T08:44:42.919016+00:00 app[web.1]: return self.view_functions[rule.endpoint](**req.view_args) 2019-11-17T08:44:42.919018+00:00 app[web.1]: File "/app/project.py", line 27, in index 2019-11-17T08:44:42.919020+00:00 app[web.1]: 'questions': Questions.query.order_by(desc('create_time')).all() 2019-11-17T08:44:42.919022+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3186, in all 2019-11-17T08:44:42.919025+00:00 app[web.1]: return list(self) 2019-11-17T08:44:42.919027+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3342, in __iter__ 2019-11-17T08:44:42.919028+00:00 app[web.1]: return self._execute_and_instances(context) 2019-11-17T08:44:42.919031+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3367, in _execute_and_instances 2019-11-17T08:44:42.919033+00:00 app[web.1]: result = conn.execute(querycontext.statement, self._params) 2019-11-17T08:44:42.919035+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 988, in execute 2019-11-17T08:44:42.919037+00:00 app[web.1]: return meth(self, multiparams, params) 2019-11-17T08:44:42.919039+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/sql/elements.py", line 287, in _execute_on_connection 2019-11-17T08:44:42.919041+00:00 app[web.1]: return connection._execute_clauseelement(self, multiparams, params) 2019-11-17T08:44:42.919043+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1107, in _execute_clauseelement 2019-11-17T08:44:42.919046+00:00 app[web.1]: distilled_params, 2019-11-17T08:44:42.919048+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1253, in _execute_context 2019-11-17T08:44:42.919050+00:00 app[web.1]: e, statement, parameters, cursor, context 2019-11-17T08:44:42.919052+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1473, in _handle_dbapi_exception 2019-11-17T08:44:42.919054+00:00 app[web.1]: util.raise_from_cause(sqlalchemy_exception, exc_info) 2019-11-17T08:44:42.919056+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 398, in raise_from_cause 2019-11-17T08:44:42.919058+00:00 app[web.1]: reraise(type(exception), exception, tb=exc_tb, cause=cause) 2019-11-17T08:44:42.919060+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 152, in reraise 2019-11-17T08:44:42.919063+00:00 app[web.1]: raise value.with_traceback(tb) 2019-11-17T08:44:42.919074+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1249, in _execute_context 2019-11-17T08:44:42.919077+00:00 app[web.1]: cursor, statement, parameters, context 2019-11-17T08:44:42.919079+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 580, in do_execute 2019-11-17T08:44:42.919081+00:00 app[web.1]: cursor.execute(statement, parameters) 2019-11-17T08:44:42.919083+00:00 app[web.1]: sqlalchemy.exc.ProgrammingError: (psycopg2.errors.UndefinedTable) relation "question" does not exist 2019-11-17T08:44:42.919085+00:00 app[web.1]: LINE 2: FROM question ORDER BY question.create_time DESC 2019-11-17T08:44:42.919087+00:00 app[web.1]: ^ 2019-11-17T08:44:42.919088+00:00 app[web.1]: 2019-11-17T08:44:42.919091+00:00 app[web.1]: [SQL: SELECT question.id AS question_id, question.title AS question_title, question.content AS question_content, question.create_time AS question_create_time, question.author_id AS question_author_id 2019-11-17T08:44:42.919094+00:00 app[web.1]: FROM question ORDER BY question.create_time DESC] 2019-11-17T08:44:42.919096+00:00 app[web.1]: (Background on this error at: http://sqlalche.me/e/f405) 2019-11-17T08:44:42.919234+00:00 app[web.1]: 10.5.225.117 - - [17/Nov/2019:08:44:42 +0000] "GET / HTTP/1.1" 500 0 "-" "-" 2019-11-17T08:44:42.918749+00:00 heroku[router]: at=info method=GET path="/" host=tianliang-flask-app.herokuapp.com request_id=c195162e-6529-4fb0-9aac-1d9dd9a450e8 fwd="58.182.174.147" dyno=web.1 connect=1ms service=7ms status=500 bytes=244 protocol=https 2019-11-17T09:02:25.748890+00:00 app[web.1]: [2019-11-17 09:02:25 +0000] [12] [ERROR] Error handling request / 2019-11-17T09:02:25.748917+00:00 app[web.1]: Traceback (most recent call last): 2019-11-17T09:02:25.748921+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1249, in _execute_context 2019-11-17T09:02:25.748923+00:00 app[web.1]: cursor, statement, parameters, context 2019-11-17T09:02:25.748932+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 580, in do_execute 2019-11-17T09:02:25.748934+00:00 app[web.1]: cursor.execute(statement, parameters) 2019-11-17T09:02:25.748936+00:00 app[web.1]: psycopg2.errors.UndefinedTable: relation "question" does not exist 2019-11-17T09:02:25.748939+00:00 app[web.1]: LINE 2: FROM question ORDER BY question.create_time DESC 2019-11-17T09:02:25.748943+00:00 app[web.1]: ^ 2019-11-17T09:02:25.748944+00:00 app[web.1]: 2019-11-17T09:02:25.748947+00:00 app[web.1]: 2019-11-17T09:02:25.748949+00:00 app[web.1]: The above exception was the direct cause of the following exception: 2019-11-17T09:02:25.748950+00:00 app[web.1]: 2019-11-17T09:02:25.748952+00:00 app[web.1]: Traceback (most recent call last): 2019-11-17T09:02:25.748953+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/gunicorn/workers/sync.py", line 134, in handle 2019-11-17T09:02:25.748955+00:00 app[web.1]: self.handle_request(listener, req, client, addr) 2019-11-17T09:02:25.748956+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/gunicorn/workers/sync.py", line 175, in handle_request 2019-11-17T09:02:25.748958+00:00 app[web.1]: respiter = self.wsgi(environ, resp.start_response) 2019-11-17T09:02:25.748991+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2463, in __call__ 2019-11-17T09:02:25.748994+00:00 app[web.1]: return self.wsgi_app(environ, start_response) 2019-11-17T09:02:25.748996+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2449, in wsgi_app 2019-11-17T09:02:25.748998+00:00 app[web.1]: response = self.handle_exception(e) 2019-11-17T09:02:25.749000+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1866, in handle_exception 2019-11-17T09:02:25.749002+00:00 app[web.1]: reraise(exc_type, exc_value, tb) 2019-11-17T09:02:25.749004+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise 2019-11-17T09:02:25.749006+00:00 app[web.1]: raise value 2019-11-17T09:02:25.749008+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2446, in wsgi_app 2019-11-17T09:02:25.749010+00:00 app[web.1]: response = self.full_dispatch_request() 2019-11-17T09:02:25.749012+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1951, in full_dispatch_request 2019-11-17T09:02:25.749014+00:00 app[web.1]: rv = self.handle_user_exception(e) 2019-11-17T09:02:25.749016+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1820, in handle_user_exception 2019-11-17T09:02:25.749018+00:00 app[web.1]: reraise(exc_type, exc_value, tb) 2019-11-17T09:02:25.749020+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise 2019-11-17T09:02:25.749023+00:00 app[web.1]: raise value 2019-11-17T09:02:25.749024+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1949, in full_dispatch_request 2019-11-17T09:02:25.749026+00:00 app[web.1]: rv = self.dispatch_request() 2019-11-17T09:02:25.749027+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1935, in dispatch_request 2019-11-17T09:02:25.749029+00:00 app[web.1]: return self.view_functions[rule.endpoint](**req.view_args) 2019-11-17T09:02:25.749030+00:00 app[web.1]: File "/app/project.py", line 27, in index 2019-11-17T09:02:25.749032+00:00 app[web.1]: 'questions': Questions.query.order_by(desc('create_time')).all() 2019-11-17T09:02:25.749033+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3186, in all 2019-11-17T09:02:25.749036+00:00 app[web.1]: return list(self) 2019-11-17T09:02:25.749038+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3342, in __iter__ 2019-11-17T09:02:25.749039+00:00 app[web.1]: return self._execute_and_instances(context) 2019-11-17T09:02:25.749041+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3367, in _execute_and_instances 2019-11-17T09:02:25.749042+00:00 app[web.1]: result = conn.execute(querycontext.statement, self._params) 2019-11-17T09:02:25.749044+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 988, in execute 2019-11-17T09:02:25.749045+00:00 app[web.1]: return meth(self, multiparams, params) 2019-11-17T09:02:25.749047+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/sql/elements.py", line 287, in _execute_on_connection 2019-11-17T09:02:25.749048+00:00 app[web.1]: return connection._execute_clauseelement(self, multiparams, params) 2019-11-17T09:02:25.749050+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1107, in _execute_clauseelement 2019-11-17T09:02:25.749051+00:00 app[web.1]: distilled_params, 2019-11-17T09:02:25.749053+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1253, in _execute_context 2019-11-17T09:02:25.749054+00:00 app[web.1]: e, statement, parameters, cursor, context 2019-11-17T09:02:25.749056+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1473, in _handle_dbapi_exception 2019-11-17T09:02:25.749057+00:00 app[web.1]: util.raise_from_cause(sqlalchemy_exception, exc_info) 2019-11-17T09:02:25.749059+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 398, in raise_from_cause 2019-11-17T09:02:25.749060+00:00 app[web.1]: reraise(type(exception), exception, tb=exc_tb, cause=cause) 2019-11-17T09:02:25.749062+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 152, in reraise 2019-11-17T09:02:25.749063+00:00 app[web.1]: raise value.with_traceback(tb) 2019-11-17T09:02:25.749074+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1249, in _execute_context 2019-11-17T09:02:25.749076+00:00 app[web.1]: cursor, statement, parameters, context 2019-11-17T09:02:25.749078+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 580, in do_execute 2019-11-17T09:02:25.749080+00:00 app[web.1]: cursor.execute(statement, parameters) 2019-11-17T09:02:25.749082+00:00 app[web.1]: sqlalchemy.exc.ProgrammingError: (psycopg2.errors.UndefinedTable) relation "question" does not exist 2019-11-17T09:02:25.749084+00:00 app[web.1]: LINE 2: FROM question ORDER BY question.create_time DESC 2019-11-17T09:02:25.749087+00:00 app[web.1]: ^ 2019-11-17T09:02:25.749089+00:00 app[web.1]: 2019-11-17T09:02:25.749092+00:00 app[web.1]: [SQL: SELECT question.id AS question_id, question.title AS question_title, question.content AS question_content, question.create_time AS question_create_time, question.author_id AS question_author_id 2019-11-17T09:02:25.749094+00:00 app[web.1]: FROM question ORDER BY question.create_time DESC] 2019-11-17T09:02:25.749096+00:00 app[web.1]: (Background on this error at: http://sqlalche.me/e/f405) 2019-11-17T09:02:25.749271+00:00 app[web.1]: 10.69.244.94 - - [17/Nov/2019:09:02:25 +0000] "GET / HTTP/1.1" 500 0 "-" "-" 2019-11-17T09:02:25.755053+00:00 heroku[router]: at=info method=GET path="/" host=tianliang-flask-app.herokuapp.com request_id=181975e4-7c78-4f7f-b131-4b1ddb544e02 fwd="58.182.174.147" dyno=web.1 connect=0ms service=92ms status=500 bytes=244 protocol=https 2019-11-17T09:06:00.663577+00:00 heroku[router]: at=info method=GET path="/" host=tianliang-flask-app.herokuapp.com request_id=571550f7-554b-42d0-b127-0a4837f6aae9 fwd="58.182.174.147" dyno=web.1 connect=1ms service=17ms status=500 bytes=244 protocol=https 2019-11-17T09:06:00.661593+00:00 app[web.1]: [2019-11-17 09:06:00 +0000] [11] [ERROR] Error handling request / 2019-11-17T09:06:00.661619+00:00 app[web.1]: Traceback (most recent call last): 2019-11-17T09:06:00.662439+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1249, in _execute_context 2019-11-17T09:06:00.662443+00:00 app[web.1]: cursor, statement, parameters, context 2019-11-17T09:06:00.662447+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 580, in do_execute 2019-11-17T09:06:00.662449+00:00 app[web.1]: cursor.execute(statement, parameters) 2019-11-17T09:06:00.662452+00:00 app[web.1]: psycopg2.errors.UndefinedTable: relation "question" does not exist 2019-11-17T09:06:00.662455+00:00 app[web.1]: LINE 2: FROM question ORDER BY question.create_time DESC 2019-11-17T09:06:00.662457+00:00 app[web.1]: ^ 2019-11-17T09:06:00.662459+00:00 app[web.1]: 2019-11-17T09:06:00.662461+00:00 app[web.1]: 2019-11-17T09:06:00.662464+00:00 app[web.1]: The above exception was the direct cause of the following exception: 2019-11-17T09:06:00.662466+00:00 app[web.1]: 2019-11-17T09:06:00.662471+00:00 app[web.1]: Traceback (most recent call last): 2019-11-17T09:06:00.662473+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/gunicorn/workers/sync.py", line 134, in handle 2019-11-17T09:06:00.662476+00:00 app[web.1]: self.handle_request(listener, req, client, addr) 2019-11-17T09:06:00.662478+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/gunicorn/workers/sync.py", line 175, in handle_request 2019-11-17T09:06:00.662480+00:00 app[web.1]: respiter = self.wsgi(environ, resp.start_response) 2019-11-17T09:06:00.662483+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2463, in __call__ 2019-11-17T09:06:00.662486+00:00 app[web.1]: return self.wsgi_app(environ, start_response) 2019-11-17T09:06:00.662488+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2449, in wsgi_app 2019-11-17T09:06:00.662491+00:00 app[web.1]: response = self.handle_exception(e) 2019-11-17T09:06:00.662493+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1866, in handle_exception 2019-11-17T09:06:00.662495+00:00 app[web.1]: reraise(exc_type, exc_value, tb) 2019-11-17T09:06:00.662498+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise 2019-11-17T09:06:00.662500+00:00 app[web.1]: raise value 2019-11-17T09:06:00.662502+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 2446, in wsgi_app 2019-11-17T09:06:00.662505+00:00 app[web.1]: response = self.full_dispatch_request() 2019-11-17T09:06:00.662507+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1951, in full_dispatch_request 2019-11-17T09:06:00.662509+00:00 app[web.1]: rv = self.handle_user_exception(e) 2019-11-17T09:06:00.662511+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1820, in handle_user_exception 2019-11-17T09:06:00.662513+00:00 app[web.1]: reraise(exc_type, exc_value, tb) 2019-11-17T09:06:00.662515+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise 2019-11-17T09:06:00.662517+00:00 app[web.1]: raise value 2019-11-17T09:06:00.662519+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1949, in full_dispatch_request 2019-11-17T09:06:00.662521+00:00 app[web.1]: rv = self.dispatch_request() 2019-11-17T09:06:00.662523+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/flask/app.py", line 1935, in dispatch_request 2019-11-17T09:06:00.662526+00:00 app[web.1]: return self.view_functions[rule.endpoint](**req.view_args) 2019-11-17T09:06:00.662528+00:00 app[web.1]: File "/app/project.py", line 27, in index 2019-11-17T09:06:00.662530+00:00 app[web.1]: 'questions': Questions.query.order_by(desc('create_time')).all() 2019-11-17T09:06:00.662532+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3186, in all 2019-11-17T09:06:00.662535+00:00 app[web.1]: return list(self) 2019-11-17T09:06:00.662537+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3342, in __iter__ 2019-11-17T09:06:00.662539+00:00 app[web.1]: return self._execute_and_instances(context) 2019-11-17T09:06:00.662541+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3367, in _execute_and_instances 2019-11-17T09:06:00.662544+00:00 app[web.1]: result = conn.execute(querycontext.statement, self._params) 2019-11-17T09:06:00.662546+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 988, in execute 2019-11-17T09:06:00.662548+00:00 app[web.1]: return meth(self, multiparams, params) 2019-11-17T09:06:00.662550+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/sql/elements.py", line 287, in _execute_on_connection 2019-11-17T09:06:00.662552+00:00 app[web.1]: return connection._execute_clauseelement(self, multiparams, params) 2019-11-17T09:06:00.662555+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1107, in _execute_clauseelement 2019-11-17T09:06:00.662557+00:00 app[web.1]: distilled_params, 2019-11-17T09:06:00.662559+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1253, in _execute_context 2019-11-17T09:06:00.662562+00:00 app[web.1]: e, statement, parameters, cursor, context 2019-11-17T09:06:00.662564+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1473, in _handle_dbapi_exception 2019-11-17T09:06:00.662566+00:00 app[web.1]: util.raise_from_cause(sqlalchemy_exception, exc_info) 2019-11-17T09:06:00.662568+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 398, in raise_from_cause 2019-11-17T09:06:00.662570+00:00 app[web.1]: reraise(type(exception), exception, tb=exc_tb, cause=cause) 2019-11-17T09:06:00.662573+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 152, in reraise 2019-11-17T09:06:00.662575+00:00 app[web.1]: raise value.with_traceback(tb) 2019-11-17T09:06:00.662587+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1249, in _execute_context 2019-11-17T09:06:00.662590+00:00 app[web.1]: cursor, statement, parameters, context 2019-11-17T09:06:00.662592+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 580, in do_execute 2019-11-17T09:06:00.662594+00:00 app[web.1]: cursor.execute(statement, parameters) 2019-11-17T09:06:00.662596+00:00 app[web.1]: sqlalchemy.exc.ProgrammingError: (psycopg2.errors.UndefinedTable) relation "question" does not exist 2019-11-17T09:06:00.662599+00:00 app[web.1]: LINE 2: FROM question ORDER BY question.create_time DESC 2019-11-17T09:06:00.662601+00:00 app[web.1]: ^ 2019-11-17T09:06:00.662603+00:00 app[web.1]: 2019-11-17T09:06:00.662607+00:00 app[web.1]: [SQL: SELECT question.id AS question_id, question.title AS question_title, question.content AS question_content, question.create_time AS question_create_time, question.author_id AS question_author_id 2019-11-17T09:06:00.662609+00:00 app[web.1]: FROM question ORDER BY question.create_time DESC] ```
python flask包使用。。。。。
![图片说明](https://img-ask.csdn.net/upload/202002/06/1580974180_632939.jpg)![图片说明](https://img-ask.csdn.net/upload/202002/06/1580974198_207304.png)![图片说明](https://img-ask.csdn.net/upload/202002/06/1580974206_672162.png) 按书中,在jupyter中写了段使用flask包的代码,放在cmd中运行不出,请问这个问题如何解决
flask_script中有关Manager的问题
app.py中代码如下 ```python from flask import Flask app = Flask(__name__) @app.route('/') def hello_world(): return 'Hello World!' if __name__ == '__main__': app.run() ``` manager.py代码如下: ```python from flask_script import * import app manager = Manager(app) @manager.command def runserver(): print('Server is running!') if __name__ == '__main__': manager.run() ``` 在cmd中键入 python manager.py runserver之后报错信息如下 ![图片说明](https://img-ask.csdn.net/upload/201807/23/1532353363_367621.png) 环境为Win10 64bit python 3.6.4 如果是在 app.py 中使用 Manager 则不会报错,请问各位大神,为什么会这样?
keras 并发load_model报错
我通过web代码实时加载模型进行预测,但报如下错误 Traceback (most recent call last): File "/root/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__ return self.wsgi_app(environ, start_response) File "/root/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app response = self.handle_exception(e) File "/root/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1540, in handle_exception reraise(exc_type, exc_value, tb) File "/root/anaconda3/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise raise value File "/root/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app response = self.full_dispatch_request() File "/root/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request rv = self.handle_user_exception(e) File "/root/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception reraise(exc_type, exc_value, tb) File "/root/anaconda3/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise raise value File "/root/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request rv = self.dispatch_request() File "/root/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args) File "/root/anaconda3/code/App.py", line 41, in predict model=load_model(root_path+model_name) File "/root/anaconda3/lib/python3.6/site-packages/keras/models.py", line 249, in load_model topology.load_weights_from_hdf5_group(f['model_weights'], model.layers) File "/root/anaconda3/lib/python3.6/site-packages/keras/engine/topology.py", line 3008, in load_weights_from_hdf5_group K.batch_set_value(weight_value_tuples) File "/root/anaconda3/lib/python3.6/site-packages/keras/backend/tensorflow_backend.py", line 2189, in batch_set_value get_session().run(assign_ops, feed_dict=feed_dict) File "/root/anaconda3/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 895, in run run_metadata_ptr) File "/root/anaconda3/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1071, in _run + e.args[0]) TypeError: Cannot interpret feed_dict key as Tensor: Tensor Tensor("Placeholder:0", shape=(1, 16), dtype=float32) is not an element of this graph.
vuejs和flask的文件夹设置问题
各位高手,我在使用vuecli3和flask开发,我在目前开发的时候遇到用户头像图片该怎么放置的问题,详细如下: 1.我目前是vuecli3和flask单独运行,中间只用axios做一些数据交互。那我的用户头像图片是该放在vue目录下还是放在flask目录下? 2.如果放在flask目录下,那我在vue中该怎么写路径? 3.我目前开发是在vuecli3下写的代码,我build之后生成的文件该放在哪里? 4.综上问题,各位高手能不能给我一个vuecli3和flask的目录放置demo。
Python中用flask怎么将HTML中模拟的数据替换为自己MySQL中的数据。
1.在做Python连接hive时已将数据库表中的数据查出来,去百度开源软件——ECharts中下载了一个html的模板,怎么将模板中模拟的数据替换为自己数据库表中的数据? Python代码: ``` from flask import Flask,render_template app = Flask(__name__) # 实例化app对象 @app.route('/') def yufun(): conn = connect(host="yue1", port=10000, user='root', password="123", database="db_zlf_15", auth_mechanism="PLAIN") cur = conn.cursor() cur.execute('select * from tb_zlf_15') # fetchall返回多个元组,即返回多条记录(rows),如果没有结果,则返回 () for result in cur.fetchall(): print(result) conn.close() return render_template('candlestick-sh.html') if __name__ == '__main__': app.run() ``` ## Python查出数据库表中的数据如下: ![图片说明](https://img-ask.csdn.net/upload/201912/22/1576981251_458475.jpg) ## html模板中模拟的数据: ![图片说明](https://img-ask.csdn.net/upload/201912/22/1576981374_655799.jpg) ## html模板运行的效果: ![图片说明](https://img-ask.csdn.net/upload/201912/22/1576981856_705289.jpg)
flask执行python manager.py db migrate -m "add table"变成直接启动程序???
怎么会直接启动程序,不应该返回迁移信息吗? 如下图所示 ![图片说明](https://img-ask.csdn.net/upload/201904/12/1555041311_478332.jpg) 不仅是migrate,init,update,deploy全是启动程序了!!!!
jinja2.exceptions.TemplateNotFound: bootstrap/base.html的错误wen'ti
app.py文件 ``` from flask import Flask from flask_bootstrap import Bootstrap app = Flask(__name__) bootstrap = Bootstrap(app) @app.route('/') def hello_world(): return 'Hello World!' @app.route('/user/<name>') def user(name): return render_template('user.html', name=name) if __name__ == '__main__': app.run() ``` 在user.html文件中有高亮提示,并且有Unresolved template reference提示 ![在user.html中的高亮显示](https://img-ask.csdn.net/upload/201910/17/1571274868_305707.png) Unresolved template reference提示如下图 ![图片说明](https://img-ask.csdn.net/upload/201910/17/1571275616_173510.jpg) 文件结构如下,templates文件夹与app.py文件同级,所以不是这个问题 ![文件结构如图显示](https://img-ask.csdn.net/upload/201910/17/1571273197_582788.png) 程序能正常运行,当访问127.0.0.1:5000/user/<name>时就会出现 Internal Server Error The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application. 并且报错:jinja2.exceptions.TemplateNotFound: bootstrap/base.html 我在网上找了很多解决方案都没有用,希望有哪位大侠能帮忙解决
python flask 如何文件限速传输
求大神解答python flask ,利用类似send_from_directory或其他方法让别人下载文件时,怎么设置这个文件传输下载速度,用到什么包或函数,就类似是网盘中会员高速下载,非会员限速下载
Python Flask发送邮件编码错误
![图片说明](https://img-ask.csdn.net/upload/201601/17/1452998568_260575.png) ____按照《Flask Web开发》第6章“电子邮件”写的,在shell里创建Message实例的时候为什么会出现这样的错误? from flask import Flask from flask.ext.mail import Mail from flask.ext.script import Manager app = Flask(__name__) app.config['MAIL_SERVER']='smtp.qq.com' app.config['MAIL_PORT']=25 app.config['MAIL_USE_TLS']=True app.config['MAIL_USERNAME']='*********@qq.com' app.config['MAIL_PASSWORD']='dtrlrascktqqbhej' mail=Mail(app) manager=Manager(app) @app.route('/') def hello_world(): return 'Hello World!' if __name__ == '__main__': manager.run()
请问python flask中文乱码问题怎么解决呢?
Linux <br> 采用flask作为网页后端<br> 返回的中文在网页上为乱码,像这种:具体错误情况如下: <br> 各种方法都试了,怎么也解决不了。 比如<br> html文件中加上这一行 ``` <meta charset="UTF-8"> ``` <br> python中 ``` app.config['JSON_AS_ASCII'] = False ``` python中文前加u a = u"王五" <br> 我的html文件本身是utf-8编码。 <br> 上面方法统统不行 后端用的是flask 的 render_template 请问该怎么办呢?
flask蓝图模式下,怎么使用pymongo
``` from flask import Flask from flask-pymongo import PyMongo app = Flask(__name__) app.config.update( MONGO_HOST='localhost', MONGO_PORT=27017, MONGO_USERNAME='bjhee', MONGO_PASSWORD='111111', MONGO_DBNAME='flask' ) mongo = PyMongo(app) ``` 这是直接在入口文件里写的方法 现在加入里蓝图 home.py ``` from flask import Blueprint import mysql.connector, logging from flask_pymongo import PyMongo import app home = Blueprint('home', __name__, url_prefix='/home') mongo = PyMongo(app) // 这里应该怎么写 因为不存在app @home.route('/test') def move_tickets_to_mongo(): res = mongo.db.acct_data_logs.find({}) ``` 这里会报错, 因为找不到app
Python Flask render template 提示template files not found?
好长时间没写了,今天复习了一下就遇到了问题: ``` from flask import Flask, render_template app = Flask(__name__) @app.route('/', methods=['GET']) def cmt(): return render_template('index.html') if __name__ == '__main__': app.run() ``` 可index.html就在templates中,怎么回事呢? 截图贴不上来, 路径是 C:\Users\Deyuan.Li\Documents\company\web\xdmed xdmed下有 app.py, templates, venv文件,index.html就在templates文件夹下。 用Pycharm写的
python 变量问题 提问有大佬知道吗?
之前都是用django 框架还没有用到这种问题 大概情况 :用了wxpython 开发桌面程序 其中有一个标记元素会重复用到,所以我想实现这类效果: a.py 文件(启动文件inloop) 定义了一个变量 aa b.py 文件改变 aa 的值 a 文件得到 aa 改变后的值 并且 a.py 会导入 b.py 文件 的内容 方式 一 : 全局声明 global 结果:全局声明 global 对不同文件没用 导入不带入全局声明 ? 方式 一 : 在 b 文件中导入 aa 变量 结果: 导包错误 a 导包 b b也导包a 报错 记得 flask 框架中 也有循环导包问题 不过改变导包位置 集可解决可是这里不行 方式三 : 将 a, b 文件内容写在一起 就不存在导包问题了 结果 : 问题解决了 但是好 low 请问 分模块来写要怎么解决这个问题 案例demo ``` # a.py from astar_mesmanager.test.b import change aa = 1 print(aa) print(change()) -------- # b.py def change(): global aa aa = 2 return aa --------- # a.py 运行结果 1 2 两个aa 不是一个变量 -------- 方案二 b.py 中加入 from astar_mesmanager.test.a import aa def change(): global aa aa = 2 return aa ------ 报错 ImportError: cannot import name 'change' ```
在用flask-sqlacodegen生成models后,如何在视图函数中使用?
在使用Flask进行web开发的时候,因为我的数据库已经有表了,所以我用 flask-sqlacodegen将存在的数据库表转化成model.py,部分文件如下: ``` # coding: utf-8 from sqlalchemy import BigInteger, Column, Date, DateTime, Float, Integer, Numeric, String from sqlalchemy.schema import FetchedValue from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() metadata = Base.metadata class TBiomas(Base): __tablename__ = 't_biomass' id = Column(Integer, primary_key=True) plant_id = Column(Integer) WP_norm = Column(Numeric(10, 4)) fwp = Column(Numeric(10, 4)) ``` 在__init__文件中,我写入了 ``` from flask_sqlalchemy import SQLAlchemy from flask import Flask app = Flask(__name__) app.config.from_pyfile('config.py') db = SQLAlchemy(app) from app import views ``` viws.py目前这样写的 错误原因: AttributeError: type object 'TBiomas' has no attribute 'query' ``` from app.models import TBiomas from app import app, db @app.route('/') def index(): results = TBiomas.query.all() db.session.commit() print(results) ``` 请问该如何将__init__.py、models.py、views.py连接起来呢?
为什么用python写的flask示例程序无法运行,刚刚接触这个,请大佬指教一下
#-*- encoding=UTF-8 -*- from flask import Flask app = Flask(__name__) @app.route('/') def index(): return "Hello World!" if __name__ == '__main__': app.run() 提示的错误如下: "F:\pycharm projects\venv\Scripts\python.exe" "F:/pycharm projects/ftest.py" * Serving Flask app "ftest" (lazy loading) * Environment: production WARNING: Do not use the development server in a production environment. Use a production WSGI server instead. * Debug mode: off Traceback (most recent call last): File "F:/pycharm projects/ftest.py", line 11, in <module> app.run() File "F:\pycharm projects\venv\lib\site-packages\flask\app.py", line 943, in run run_simple(host, port, self, **options) File "F:\pycharm projects\venv\lib\site-packages\werkzeug\serving.py", line 814, in run_simple inner() File "F:\pycharm projects\venv\lib\site-packages\werkzeug\serving.py", line 774, in inner fd=fd) File "F:\pycharm projects\venv\lib\site-packages\werkzeug\serving.py", line 660, in make_server passthrough_errors, ssl_context, fd=fd) File "F:\pycharm projects\venv\lib\site-packages\werkzeug\serving.py", line 577, in __init__ self.address_family), handler) File "C:\Users\asus\AppData\Local\Programs\Python\Python36-32\lib\socketserver.py", line 453, in __init__ self.server_bind() File "C:\Users\asus\AppData\Local\Programs\Python\Python36-32\lib\http\server.py", line 138, in server_bind self.server_name = socket.getfqdn(host) File "C:\Users\asus\AppData\Local\Programs\Python\Python36-32\lib\socket.py", line 673, in getfqdn hostname, aliases, ipaddrs = gethostbyaddr(name) UnicodeDecodeError: 'utf-8' codec can't decode byte 0xbd in position 0: invalid start byte
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