sys.path.append(os.path.join(os.path.dirname(__file__), ".."))是啥意思😭

Question

问题遇到的现象和发生背景

从GitHub找到的。f-AnoGAN缺陷检测代码，运行不成功
报错：TypeError: expected str, bytes or os.PathLike object, not NoneType
搜了结果说报这个错是跟路径相关的，我猜测是跟这句有关，
sys.path.append(os.path.join(os.path.dirname(file), ".."))
查了也没有相关的回答。请懂的人帮帮我

Answer 1

• 对于模块和自己写的脚本不在同一个目录下，在脚本开头加sys.path.append('XXX')，加入XXX为环境变量。

注意：如果是在Python支持不是很好的IDE需要设置，我在pycharm下，一个工程多个层级文件夹，使用from lib.service.beautifymsgcard import BeautifyMsgCard 即可， 是不需要设置环境变量的。

print(os.path.abspath(__file__))# 当前执行文件的文件路径+文件名
print(os.path.dirname(__file__)) #当前执行文件的文件路径
print(os.path.join(os.path.dirname(__file__), "..")) #当前执行文件的文件路径上一级文件路径
print(sys.path)
sys.path.append(os.path.join(os.path.dirname(__file__), ".."))
print(sys.path)

执行如下：

/Users/valley/PycharmProjects/sound/515test.py
/Users/valley/PycharmProjects/sound
/Users/valley/PycharmProjects/sound/..
['/Users/valley/PycharmProjects/sound', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pydev', '/Users/valley/PycharmProjects/sound', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pycharm_display', '/Applications/PyCharm.app/Contents/plugins/python/helpers/third_party/thriftpy', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pydev', '/Users/valley/opt/anaconda3/lib/python39.zip', '/Users/valley/opt/anaconda3/lib/python3.9', '/Users/valley/opt/anaconda3/lib/python3.9/lib-dynload', '/Users/valley/opt/anaconda3/lib/python3.9/site-packages', '/Users/valley/opt/anaconda3/lib/python3.9/site-packages/aeosa', '/Users/valley/opt/anaconda3/lib/python3.9/site-packages/locket-0.2.1-py3.9.egg', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pycharm_matplotlib_backend', '/Users/valley/opt/anaconda3/lib/python3.9/site-packages/IPython/extensions', '/Users/valley/PycharmProjects/sound']
['/Users/valley/PycharmProjects/sound', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pydev', '/Users/valley/PycharmProjects/sound', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pycharm_display', '/Applications/PyCharm.app/Contents/plugins/python/helpers/third_party/thriftpy', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pydev', '/Users/valley/opt/anaconda3/lib/python39.zip', '/Users/valley/opt/anaconda3/lib/python3.9', '/Users/valley/opt/anaconda3/lib/python3.9/lib-dynload', '/Users/valley/opt/anaconda3/lib/python3.9/site-packages', '/Users/valley/opt/anaconda3/lib/python3.9/site-packages/aeosa', '/Users/valley/opt/anaconda3/lib/python3.9/site-packages/locket-0.2.1-py3.9.egg', '/Applications/PyCharm.app/Contents/plugins/python/helpers/pycharm_matplotlib_backend', '/Users/valley/opt/anaconda3/lib/python3.9/site-packages/IPython/extensions', '/Users/valley/PycharmProjects/sound', '/Users/valley/PycharmProjects/sound/..']

若有帮助，谢谢采纳和打赏~