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RoyalUp
Asked: 2020-01-12 04:06:00 +0800 CST 2020-01-12 04:06:00 +0800 CST

ValueError: source code string cannot contain null bytes

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I am using the auto py to exe library to pass a file from python to .exe . But when converting test.py I get an error and it gives me this Traceback that I don't know what it could be due to.

File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 1638, in _find_head_package
    target_module_headname, target_package_name, source_package)
  File "c:\python\python37\lib\site-packages\PyInstaller\depend\analysis.py", line 382, in _safe_import_module
    module_basename, module_name, parent_package)
  File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 2055, in _safe_import_module
    module_name, file_handle, pathname, metadata)
  File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 2093, in _load_module
    m = self._load_package(fqname, pathname, packagepath)
  File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 2912, in _load_package
    self._load_module(fqname, fp, buf, stuff)
  File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 2105, in _load_module
    co = compile(contents, pathname, 'exec', ast.PyCF_ONLY_AST, True)
ValueError: source code string cannot contain null bytes

It is a longer error trace but I put only part of it. I put the project structure in which I only use the img package , the other python files I don't use, I just want to pass the tests.py . mainClass and preprocessing I don't use them at all. What is causing this error?

enter image description here

python

1 Answers

  1. Best Answer

    The problem seems to be the existence of "null" bytes, that is, with the ascii value 0x00inside the source file, if you don't have a linux you can use the python console itself to eliminate them.

    I have created a file test.py with a character 0x00to reproduce the error

    python3 #Ejecutado desde el directorio donde se encuentra pueba.py
>>> with open('prueba.py', 'rb') as f: code = f.read()
...
>>> code
b"print('Hola')\n\x00"
# La siguiente línea es para comprobar que se produce el mismo error, no es estrictamente necesaria para la solución
>>> eval(code)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: source code string cannot contain null bytes
# La siguiente línea elimina los caracteres nulos
>>> with open('prueba2.py', 'wb') as f: f.write(code.replace(b'\x00', b''))

    A file is created the prueba2.pysame as prueba.pybut without the null characters, I do not replace it directly prueba.pyfor security reasons, but once it is verified that it is OK, it should be replaced.

    By the way, I recommend that you use the WSL on Windows to have a linux with its commands that helps in certain situations, especially if you are developing

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