当在调试模式下运行脚本时，我立即得到一个键为b'VIRTUAL_ENV '的KeyError。我在AWS ec2远程机器上运行。（即使在尝试运行以下代码时也会发生这种情况：（一个月一个月）

Exception has occurred: KeyError
'VIRTUAL_ENV'
  File "/usr/lib/python3.6/os.py", line 666, in __getitem__
    value = self._data[self.encodekey(key)]

During handling of the above exception, another exception occurred:

  File "/usr/lib/python3.6/os.py", line 669, in __getitem__
    raise KeyError(key) from None
  File "/usr/lib/python3.6/_collections_abc.py", line 666, in __contains__
    self[key]
  File "/usr/lib/python3.6/site.py", line 313, in getsitepackages
    if 'VIRTUAL_ENV' in os.environ or sys.base_prefix != sys.prefix:
  File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)```