使用已编译的python文件检查模块

Question

I have two files caller.py and callee.py

caller.py

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from callee import fn
def caller():
  fn()

caller()

callee.py

import inspect
def fn():
  print inspect.stack()

Now I compiled both caller.py and callee.py to get the corresponding pyc files and moved them to a new directory compiled . This is the directory structure.

├── __init__.py
├── callee.py
├── caller.py
└── compiled
    ├── __init__.pyc
    ├── callee.pyc
    └── caller.pyc

I modified caller.py to remove all the comments, resulting in: caller.py

from callee import fn
def caller():
  fn()

caller()

When I execute python compiled/caller.pyc This is the error thrown

Traceback (most recent call last): File "caller.py", line 73, in

File "caller.py", line 71, in caller

File "callee.py", line 4, in fn

File "/usr/local/Cellar/python@2/2.7.15/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py", line 1062, in stack return getouterframes(sys._getframe(1), context) File "/usr/local/Cellar/python@2/2.7.15/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py", line 1040, in getouterframes framelist.append((frame,) + getframeinfo(frame, context)) File "/usr/local/Cellar/python@2/2.7.15/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py", line 1015, in getframeinfo lines, lnum = findsource(frame) File "/usr/local/Cellar/python@2/2.7.15/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py", line 579, in findsource if pat.match(lines[lnum]): break IndexError: list index out of range

Looks like inspect is trying to read from the source file .py even though it is in a different directory. This error does not seem to occur when I navigate to some other directory.

What is the explanation for this? Does inspect.stack() look for the filename's (caller.pyc) py equivalent in the current working directory?

Answer 1

Python looks for suitable modules based on its PATH , and the first place it looks for them is in the folder you are when you launch the program.

If you want the interpreter to ignore the original source files, move to the directory where the .pyc files are and launch the script with python caller.pyc