How can I check the syntax of Python script without executing it

Question

I used to use perl -c programfile to check the syntax of a Perl program and then exit without executing it  Is there an equivalent way to do this for a Python script

User · Answer

for some reason   I am a py newbie       the -m call did not work      so here is a bash wrapper func          ---------------------------------------------------------   check the python synax for all the   py files under the    lt  lt product version dir sfw python   --------------------------------------------------------- doCheckPythonSyntax         doLog  DEBUG START doCheckPythonSyntax       test -z   sleep interval     sleep   sleep interval      cd  product version dir sfw python       python3 -m compileall   product version dir sfw python         foreach   py file         while read -r f   do            py name ext   basename  f          py name   py name ext              doLog  python3 -c   import  py name              doLog  python3 -m py compile  f           python3 -c  import  py name            python3 -m py compile   f          test    -ne 0  amp  amp  sleep 5      done  lt   lt  find   product version dir sfw python  -type f -name    py        doLog  DEBUG STOP  doCheckPythonSyntax      eof func doCheckPythonSyntax

User · Answer

Thanks to the above answers  Rosh Oxymoron  I improved the script to scan all files in a dir that are python files  So for us lazy folks just give it the directory and it will scan all the files in that directory that are python  import sys import glob  os  os chdir sys argv 1   for file in glob glob  quot   py quot        source   open file   r   read       n      compile source  file   exec    Save this as checker py and run python checker py   YOURDirectoryTOCHECK

User · Answer

Here s another solution  using the ast module   python -c  import ast  ast parse open  programfile   read       To do it cleanly from within a Python script   import ast  traceback  filename    programfile  with open filename  as f      source   f read   valid   True try      ast parse source  except SyntaxError      valid   False     traceback print exc      Remove to silence any errros print valid

User · Answer

You can check the syntax by compiling it   python -m py compile script py

User · Answer

import sys filename   sys argv 1  source   open filename   r   read       n  compile source  filename   exec     Save this as checker py and run python checker py yourpyfile py

User · Answer

Pyflakes does what you ask  it just checks the syntax  From the docs       Pyflakes makes a simple promise  it will never complain about style  and it will try very  very hard to never emit false positives       Pyflakes is also faster than Pylint or Pychecker  This is largely because Pyflakes only examines the syntax tree of each file individually    To install and use     pip install pyflakes   pyflakes yourPyFile py

User · Answer

You can use these tools    PyChecker Pyflakes Pylint

User · Answer

Perhaps useful online checker PEP8   http   pep8online com

[python] How can I check the syntax of Python script without executing it?

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