Home/ Questions/Simple solutions for the oserror: [winerror 193] %1 is not a valid win32 application error
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Lou Sanchez
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Asked: 2022-05-12T10:09:20+00:00 In:

Simple solutions for the oserror: [winerror 193] %1 is not a valid win32 application error

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I get an error

import subprocess 
 subprocess.call(['hello.py', 'htmlfilename.htm'])
 Traceback (most recent call last):
  File "<pyshell#42>", line 1, in <module>
  subprocess.call(['hello.py', 'htmlfilename.htm'])
  File "C:\Python34\lib\subprocess.py", line 537, in call
  with Popen(*popenargs, **kwargs) as p:
  File "C:\Python34\lib\subprocess.py", line 858, in __init__
  restore_signals, start_new_session)
  File "C:\Python34\lib\subprocess.py", line 1111, in _execute_child
  startupinfo)
 OSError: [WinError 193] %1 is not a valid Win32 application

when trying to call a Python file “hello.py” from within the python interpreter with subprocess. How to fix the oserror: [winerror 193] %1 is not a valid win32 application error? Please give me some advice.

 

It is quite obvious. The hello.py file is not executable. The executable must be specified:

subprocess.call(['python.exe', 'hello.py', 'htmlfilename.htm'])

To make python.exe visible in the search path, you can either pass the entire path to the executable that runs the calling script or the python.exe address.

import sys
subprocess.call([sys.executable, 'hello.py', 'htmlfilename.htm'])
oserror
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2 Answers

  1. Best Answer
    Expert

    The cause: This error happens because  the file hello.py  is not an executable file. then you have to specify the executable:

    subprocess.call(['python.exe', 'hello.py', 'htmlfilename.htm'])

    The solution: To resolve this error you’ll need python.exe to be in the search path, or you can specify the entire path to the executable file running the calling script:

    import sys subprocess.call([sys.executable, 'hello.py', 'htmlfilename.htm'])
    • 11

  2. Installers of Python usually register.py files to the system. It works if you explicitly run the shell 

    import subprocess
subprocess.call(['hello.py', 'htmlfilename.htm'], shell=True)
# --- or ----
subprocess.call('hello.py htmlfilename.htm', shell=True)

    On the command line, you can inspect your file associations. 

    C:\>assoc .py
.py=Python.File

C:\>ftype Python.File
Python.File="C:\Python27\python.exe" "%1" %*
    • 14

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