Windows10下PyCharm社区版无法切换至Python2.7.1解释器求助

在PyCharm Community Edition 2022.3.3中按路径File->Settings->Python Interpreter->Show All->Add Interpreter添加Python2.7解释器时，触发如下报错：

Traceback (most recent call last):
  File "C:\Python27\lib\runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "C:\Python27\lib\runpy.py", line 72, in _run_code
    exec code in run_globals
  File "C:\Program Files\JetBrains\PyCharm Community Edition 2022.3.3\plugins\python-ce\helpers\virtualenv-20.13.0.pyz\__main__.py", line 167, in <module>
  File "C:\Program Files\JetBrains\PyCharm Community Edition 2022.3.3\plugins\python-ce\helpers\virtualenv-20.13.0.pyz\__main__.py", line 163, in run
  File "C:\Program Files\JetBrains\PyCharm Community Edition 2022.3.3\plugins\python-ce\helpers\virtualenv-20.13.0.pyz\virtualenv\__main__.py", line 18, in run
  File "C:\Program Files\JetBrains\PyCharm Community Edition 2022.3.3\plugins\python-ce\helpers\virtualenv-20.13.0.pyz\virtualenv\run\__init__.py", line 30, in cli_run
  File "C:\Program Files\JetBrains\PyCharm Community Edition 2022.3.3\plugins\python-ce\helpers\virtualenv-20.13.0.pyz\virtualenv\run\__init__.py", line 48, in session_via_cli
  File "C:\Program Files\JetBrains\PyCharm Community Edition 2022.3.3\plugins\python-ce\helpers\virtualenv-20.13.0.pyz\virtualenv\run\__init__.py", line 69, in build_parser
  File "C:\Program Files\JetBrains\PyCharm Community Edition 2022.3.3\plugins\python-ce\helpers\virtualenv-20.13.0.pyz\virtualenv\run\plugin\discovery.py", line 22, in get_discover
StopIteration

已确认Python2.7.1安装完成且环境变量配置正常，CMD中可正常调用Python2.7。

解决方案 #

方法1：降级PyCharm版本 #

PyCharm 2022.3.x版本内置的virtualenv 20.13.0对Python2.7兼容性不佳，建议降级到PyCharm 2021.3.x或更早版本，这些版本的virtualenv与Python2.7适配性更好。

方法2：手动创建虚拟环境后导入PyCharm #

1. 打开CMD，进入目标目录，执行命令安装兼容版本的virtualenv并创建虚拟环境：

   python2.7 -m pip install virtualenv==16.7.9
   virtualenv venv_py27
   

2. 回到PyCharm，进入Settings->Python Interpreter->Show All->Add Interpreter，选择Existing environment，找到刚才创建的虚拟环境目录下的Scripts\python.exe路径，完成添加。

方法3：修改PyCharm内置virtualenv文件 #

1. 找到PyCharm安装目录下的plugins/python-ce/helpers/virtualenv-20.13.0.pyz文件，用压缩工具（如7-Zip）解压。
2. 打开virtualenv/run/plugin/discovery.py，修改get_discover函数：
   原代码：

   def get_discover(session):
       return next(i for i in session.plugin.discover if i.name == "discover")
   

   修改为：

   def get_discover(session):
       try:
           return next(i for i in session.plugin.discover if i.name == "discover")
       except StopIteration:
           from virtualenv.run.plugin.discover import Discover
           return Discover(session)
   

3. 重新打包为pyz格式，替换原文件（操作前请备份原文件）。

内容的提问来源于stack exchange，提问作者Pietia