Source code for cirq.testing.only_test_in_python3

# Copyright 2018 The Cirq Developers
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# See the License for the specific language governing permissions and
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import sys


[docs]def only_test_in_python3(func):
    """A decorator that indicates a test should not execute in python 2.

    For example, in python 2 repr('a') is "u'a'" instead of "'a'" when
    from __future__ import unicode is present (which it will be, since 3to2
    inserts it for us). This is annoying to work around when testing repr
    methods, so instead you can just tag the test with this decorator.
    """
    if sys.version_info.major < 3:
        return None  # coverage: ignore
    return func