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invalid-print-syntax (F633)

Added in v0.0.39 · Related issues · View source

Derived from the Pyflakes linter.

What it does

Checks for print statements that use the >> syntax.

Why is this bad?

In Python 2, the print statement can be used with the >> syntax to print to a file-like object. This print >> sys.stderr syntax no longer exists in Python 3, where print is only a function, not a statement.

Instead, use the file keyword argument to the print function, the sys.stderr.write function, or the logging module.

Example

from __future__ import print_function
import sys

print >> sys.stderr, "Hello, world!"

Use instead:

print("Hello, world!", file=sys.stderr)

Or:

import sys

sys.stderr.write("Hello, world!\n")

Or:

import logging

logging.error("Hello, world!")

References