无法将子流程模块导入python3

Question

Im trying to import subprocess. However Im unable to even import subprocess.

Currently, my file (throwaway.py) consists of only one line:

import subprocess

but it returns the error:

Traceback (most recent call last):
  File "throwaway.py", line 1, in <module>
    import subprocess
ImportError: bad magic number in 'subprocess': b'\x03\xf3\r\n'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
  File "/usr/lib/python3/dist-packages/apport/report.py", line 12, in <module>
    import subprocess, tempfile, os.path, re, pwd, grp, os, time
ImportError: bad magic number in 'subprocess': b'\x03\xf3\r\n'

Original exception was:
Traceback (most recent call last):
  File "throwaway.py", line 1, in <module>
    import subprocess
ImportError: bad magic number in 'subprocess': b'\x03\xf3\r\n'

What are magic number errors? I read that they occur when you accidentally give a file the .pyc extention rather than .py?

Answer 1

In this case the error occurs because for some reason your code is importing Python 2.7 subprocess.pyc into Python 3. Python 2.7 .pyc s start with b'\\x03\\xf3\\r\\n' . Perhaps you've created one virtualenv for both Python 2 and 3 (it wouldn't work ), or are using a wrong PYTHONPATH .

Answer 2

Use pyclean and try to import it again.

pyclean <path>

will remove all pyc files in path you'll provide (recursively), so there won't be compiled files, so no conflict.