mac os 10.13.6 install python gevent

I was to install the python2 version of gevent, and found that using pip install gevent directly on the mac would fail and report the following error:

ERROR: Could not find a version that satisfies the requirement gevent (from versions: none)
ERROR: No matching distribution found for gevent

Later found out that it can be installed like this:

Pass herePortalDownload the required gevent version, enter the directory where it is located after downloading, and executepip install geventXX.whlYou can successfully install gevent.

At this time, gevent is only installed locally. If pycharm is used and the current project specifies a python virtual environment, you need to click "Terminal" in the lower left corner of pycharm, and then repeat the above operation to successfully install in the current virtual environment gevent. But at this time, you may find that there is still a "red line" in the code where gevent is used to indicate that gevent has not been successfully referenced. At this time, you need to do the following: open "Preferences", you should find the "gevent" package in "Project Interpreter" Yes, double-click the "gevent" package, click "Install Package" after entering, and then look at the code, the "red line" in the code has disappeared.

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