Loader FrozenImporter cannot handle module os

[evilvlso]

env:
python : 3.7
pyinstaller :3.4
pyinstaller -F python.py
get this error:

Traceback (most recent call last):
  File "c:\users\administrator\appdata\local\programs\python\python37\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 438, in get_code
    return self._pyz_archive.extract(fullname)[1]
  File "c:\users\administrator\appdata\local\programs\python\python37\lib\site-packages\PyInstaller\loader\pyimod02_archive.py", line 371, in extract
    obj = zlib.decompress(obj)
zlib.error: Error -3 while decompressing data: incorrect header check

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "site-packages\PyInstaller\loader\pyiboot01_bootstrap.py", line 25, in <module>
  File "c:\users\administrator\appdata\local\programs\python\python37\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 607, in exec_module
    bytecode = self.get_code(spec.loader_state)
  File "c:\users\administrator\appdata\local\programs\python\python37\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 440, in get_code
    raise ImportError('Loader FrozenImporter cannot handle module ' + fullname)
ImportError: Loader FrozenImporter cannot handle module os
[5836] Failed to execute script pyiboot01_bootstrap

[raza-elahi]

PyInstaller: 3.4

  File "/home/raza/.pyenv/versions/anaconda3-4.2.0/envs/mizuho/lib/python3.7/site-packages/PyInstaller/loader/pyimod03_importers.py", line 438, in get_code
    return self._pyz_archive.extract(fullname)[1]
  File "/home/raza/.pyenv/versions/anaconda3-4.2.0/envs/mizuho/lib/python3.7/site-packages/PyInstaller/loader/pyimod02_archive.py", line 371, in extract
    obj = zlib.decompress(obj)
zlib.error: Error -3 while decompressing data: incorrect header check

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "site-packages/PyInstaller/loader/pyiboot01_bootstrap.py", line 25, in <module>
  File "/home/raza/.pyenv/versions/anaconda3-4.2.0/envs/mizuho/lib/python3.7/site-packages/PyInstaller/loader/pyimod03_importers.py", line 607, in exec_module
    bytecode = self.get_code(spec.loader_state)
  File "/home/raza/.pyenv/versions/anaconda3-4.2.0/envs/mizuho/lib/python3.7/site-packages/PyInstaller/loader/pyimod03_importers.py", line 440, in get_code
    raise ImportError('Loader FrozenImporter cannot handle module ' + fullname)
ImportError: Loader FrozenImporter cannot handle module os
[187467] Failed to execute script pyiboot01_bootstrap```

[raza-elahi]

I can't call it a solution but I got past the error using command line to add all the data instead of using the spec file.

P.S. By command line I mean that I used "--add-data"

[eputin2]

What data did you add to make this error go away?

[raza-elahi]

I was using PyInstaller to first generate a spec, modify it to add some files that my code needed, and then ran PyInstaller on the spec file to bundle the code. This wasn't working and causing the error.

I tried using the command line notation for adding the files (pyinstaler code.py --add-data path/to/data ...) and that worked.

[eputin2]

I’m familiar with the errror - I was just wondering what paths to data you used to fix the OS error?

[parthkumargadhiya]

with:
python : 3.6
pyinstaller :3.4
pyinstaller xyz.spec

I was getting the same error. But I solved it. Can you please post also the .spec file so I can help you. Please also mention which module have you installed along with it.

[la-vie-est-belle]

I got the same error. Got it when I tried to use --key to encrypt the exe.

Did't use any files or datas:

import requests
from bs4 import BeautifulSoup


def get_page_source(page_num):
    print('Crawling page %d' % page_num)

    url = 'http://books.toscrape.com/catalogue/page-%d.html' % page_num
    r = requests.get(url)
    return r.text


def get_book_info(page_source):
    soup = BeautifulSoup(page_source, features='lxml')
    titles = soup.select('h3 > a')
    for title in titles:
        print(title.get('title'))


if __name__ == '__main__':
    # 1-50
    for i in range(1, 51):
        page_source = get_page_source(i)
        get_book_info(page_source)

[parthkumargadhiya]

I think you are using pycryptodome. Use pycrypto module to avoid Loader FrozenImporter cannot handle module os error.

Installing on Windows

1. Install Python 3.x
2. Install Visual C++ Build Tools
3. Install pycrypto module
   cd "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build"
vcvarsall.bat x86_amd64
cd %VCINSTALLDIR%
for /R %f in (*stdint.h) do set CL=-FI"%f"
pip install pycrypto

This will work and able to encrypt the executable file using the .spec file or direct. :)

[htgoebel]

@evilvlso

1. Try removing the build and dist directory, then run PyInstaller with --clean.
2. --key is is not supported.

Otherwise please provide more details, see How to report Bugs. Esp. please provide a minimal example to reproduce the error.

[htgoebel]

No response for 4 month. closing.

[px528]

If this issue happened in linux, just replace pycryptodome with pycrypto.

[fengerzh]

My case is Windows Defender automatically delete my exe file caused this error. If disable Windows Defender, everything works fine.