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

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Chapters
00:00 Question
00:25 Accepted answer (Score 710)
00:38 Answer 2 (Score 71)
00:51 Answer 3 (Score 28)
01:09 Answer 4 (Score 23)
01:38 Thank you

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Full question
https://stackoverflow.com/questions/4284...

Answer 1 links:
[PyChecker]: http://pychecker.sourceforge.net/
[Pyflakes]: https://github.com/pyflakes/pyflakes
[Pylint]: http://www.logilab.org/857

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https://meta.stackexchange.com/help/lice...

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Tags
#python #compilation #syntaxchecking

#avk47

ACCEPTED ANSWER

Score 747

You can check the syntax by compiling it:

python -m py_compile script.py

ANSWER 2

Score 71

You can use these tools:

ANSWER 3

Score 28

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.

ANSWER 4

Score 28

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)