PyCharm Auto Completion

已回答

Permanently deleted user

创建于 2016年09月08日 01:59

Hey Experts,

Could you please help me to figure out the solution for stackoverflow question. http://stackoverflow.com/questions/14611714/python-pycharm-ctrl-space-does-not-bring-up-code-completion

import urllib.request
import urllib.response

print("Starting")
r = urllib.request.urlopen("http://www.python.org")

r.  <------------ No code completion, why not?!

print (r.getcode())

1 条评论

Mikhail Golubev

创建于 2016年09月08日 14:17

CrazyCoder was right there. The problem is that we are not able to infer proper return type of the function "urllib.request.urlopen()" since its implementation uses some dynamic tricks that we cannot handle statically, in particular:

def urlopen(url, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
            *, cafile=None, capath=None, cadefault=False, context=None):
    ...
    return opener.open(url, data, timeout)

class OpenerDirector:
   ...
    def open(self, fullurl, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
        ...
        response = self._open(req, data)

        # post-process response
        meth_name = protocol+"_response"
        for processor in self.process_response.get(protocol, []):
            meth = getattr(processor, meth_name)
            response = meth(req, response)

        return response

Normally, we deal with difficult cases like that using external annotations in python-skeletons but it doesn't contain type hints for "urllib.request" module yet. Also in the upcoming versions of PyCharm we're planning to switch to the collection of annotations gathered in typeshed project. It evolves much more actively and already contains some annotations for "urllib". To benefit from them you just need to drop "urllib" package with annotations somewhere in your interpreter paths, so that PyCharm could find the respective .pyi stubs.

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