请教python,有个属性在类init没初始化，如何调用类方法属性

Question

阅读SSeclient 源码发现

from __future__ import unicode_literals

import codecs
import re
import time
import warnings

import six

import requests

__version__ = '0.0.27'

# Technically, we should support streams that mix line endings.  This regex,
# however, assumes that a system will provide consistent line endings.
end_of_field = re.compile(r'\r\n\r\n|\r\r|\n\n')


class SSEClient(object):
    def __init__(self, url, last_id=None, retry=3000, session=None, chunk_size=1024, **kwargs):
        self.url = url
        self.last_id = last_id
        self.retry = retry
        self.chunk_size = chunk_size

        # Optional support for passing in a requests.Session()
        self.session = session

        # Any extra kwargs will be fed into the requests.get call later.
        self.requests_kwargs = kwargs

        # The SSE spec requires making requests with Cache-Control: nocache
        if 'headers' not in self.requests_kwargs:
            self.requests_kwargs['headers'] = {}
        self.requests_kwargs['headers']['Cache-Control'] = 'no-cache'

        # The 'Accept' header is not required, but explicit > implicit
        self.requests_kwargs['headers']['Accept'] = 'text/event-stream'

        # Keep data here as it streams in
        self.buf = ''

        self._connect()

    def _connect(self):
        if self.last_id:
            self.requests_kwargs['headers']['Last-Event-ID'] = self.last_id

        # Use session if set.  Otherwise fall back to requests module.
        requester = self.session or requests
        self.resp = requester.get(self.url, stream=True, **self.requests_kwargs)
        self.resp_iterator = self.iter_content()
        encoding = self.resp.encoding or self.resp.apparent_encoding
        # print(encoding)
        #查找encoding对应解码，encoding=utf8
        self.decoder = codecs.getincrementaldecoder(encoding)(errors='replace')

        # TODO: Ensure we're handling redirects.  Might also stick the 'origin'
        # attribute on Events like the Javascript spec requires.
        self.resp.raise_for_status()

    def iter_content(self):
        def generate():
            while True:
                if hasattr(self.resp.raw, '_fp') and \
                        hasattr(self.resp.raw._fp, 'fp') and \
                        hasattr(self.resp.raw._fp.fp, 'read1'):
                    chunk = self.resp.raw._fp.fp.read1(self.chunk_size)
                    # print(chunk)
                else:
                    # _fp is not available, this means that we cannot use short
                    # reads and this will block until the full chunk size is
                    # actually read
                    chunk = self.resp.raw.read(self.chunk_size)
                if not chunk:
                    break
                yield chunk

        return generate()

self.resp 属性没有在init初始化里，但是 def iter_content(self) 的方法可以调用self.resp

我尝试简单实现下，报错

class A(object):
    def __init__(self,name):
        self.name = name
        self.list = []
        self._add()

    def _add(self):
        self.b= 1
        self.resp = "haha"
        while b<10:
            yield self.b
            self.b+=1
    def p(self):
        chunk = self.resp
        print(chunk)
        

运行结果及报错内容

a = A("a")
a.p()

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Input In [3], in <cell line: 1>()
----> 1 a.p()

Input In [1], in A.p(self)
     13 def p(self):
---> 14     chunk = self.resp
     15     print(chunk)

AttributeError: 'A' object has no attribute 'resp'

我想问下，源码里如何实现的呢

Answer 1

你把下边这几行代码去掉就可以了，所以源码中的实现你是可以复制的，如有帮助，请采纳！
while b<10:
yield self.b
self.b+=1