invalid syntax (<string>, line 4) (syntax-error)

Question

I have an invalid syntax according to flake8, pylint, but the code works. What's wrong with that code?

I did lots of Google search but couldn't find anything.

#!/usr/bin/env python
with open("test.py", "a") as output:
    # E:  4, 0: invalid syntax (<string>, line 4) (syntax-error)
    print("hello world", file=output)

Are you sure you are running the linters for 3 and not those for 2? Under 2, due to the print statement, it is an error for the same reason that (1, a=2) is an error because tuples cannot have key value pairs. Only argument lists can. — Dan D.
– Dan D., Commented Jun 9, 2019 at 2:03

wertie8297 · Accepted Answer · 2019-06-09 01:35:06Z

1

What version of Python are you running? I'm not sure when it was implemented exactly but I don't think earlier versions of Python had a file=output parameter for the print() function so your interpreter might only be expecting a string

answered Jun 9, 2019 at 1:35

wertie8297

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2 Comments

yes4me Over a year ago

I am using Python 2.7.15

wertie8297 Over a year ago

Ah ok, well I think that's the problem - after some googling, it seems like there are two ways to handle it: 1) If you have access, use from __future__ import print_function which allows you to use the print() function from Python 3.x in your Python 2.7 code, or: 2) Apparently this would also write to a file, though I don't have Python 2.7 installed so I can't verify: print >>output, 'This is a test' (replace the 'this is a test' with your text)

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