Try to run this command from the system terminal. Make sure that you use the correct version of '...
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PyCharm中導入flask這個module時遇到：
Try to run this command from the system terminal. Make sure that you use the correct version of 'pip' installed for your Python interpreter located at '/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7'. 40:490: execution error: Traceback (most recent call last): File "/Applications/PyCharm.app/Contents/helpers/packaging_tool.py", line 184, in main retcode = do_install(pkgs) File "/Applications/PyCharm.app/Contents/helpers/packaging_tool.py", line 109, in do_install return pip.main(['install'] + pkgs) AttributeError: 'module' object has no attribute 'main' (4) 
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但是在命令窗口中通過pip install flask安裝成功，並且可以導入flask：
TQ-WXdeMacBook-Pro:~ anonyper$ pip install flask Collecting flask Using cached https://files.pythonhosted.org/packages/7f/e7/08578774ed4536d3242b14dacb4696386634607af824ea997202cd0edb4b/Flask-1.0.2-py2.py3-none-any.whl Requirement already satisfied: Jinja2>=2.10 in /usr/local/lib/python2.7/site-packages (from flask) (2.10) Requirement already satisfied: itsdangerous>=0.24 in /usr/local/lib/python2.7/site-packages (from flask) (0.24) Requirement already satisfied: Werkzeug>=0.14 in /usr/local/lib/python2.7/site-packages (from flask) (0.14.1) Requirement already satisfied: click>=5.1 in /usr/local/lib/python2.7/site-packages (from flask) (6.7) Requirement already satisfied: MarkupSafe>=0.23 in /usr/local/lib/python2.7/site-packages (from Jinja2>=2.10->flask) (1.0) Installing collected packages: flask Successfully installed flask-1.0.2 TQ-WXdeMacBook-Pro:~ anonyper$ python Python 2.7.15 (default, Jun 17 2018, 12:46:58) [GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.39.2)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import flask >>> 可以看到是可以成功安裝並導入的，但是在PyCharm中就一直無法import，而且install的時候就會報上面的錯誤，這是因為PyCharm選擇的python解釋器和pip版本的問題，通過PyCharm的設置可以看到使用的解釋器python版本是：2.7.10版本，而在命令窗口使用python -v版本可以看到命令窗口使用的python版本是2.7.15_1
TQ-WXdeMacBook-Pro:~ anonyper$ python -v # installing zipimport hook import zipimport # builtin # installed zipimport hook # /usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site.pyc matches /usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site.py 而且仔細看就可以發現兩個python的路徑也不一樣，其中PyCharm中使用的是Mac 系統內置的版本，這個時候需要切換PyCharm解釋器為命令窗口使用的版本Python 2.7.15: (/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/bin/python2.7)
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切換的時候可能(我的是已經添加進去了)在設置中不會有這個版本的選項，這個時候只需要手動把路徑寫進去即可。
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然后就發現flask這個module可以被導入了。
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