PyCharm 安装完默认是python3 查看mac os默认python2安装路径 Last login: Sun Jul 15 18:41:16 on ttys000y50@Y50:~$pythonPython 2.7.10 (default, Oct 6 2017, 22:29:07) [GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-