本文整理汇总了Python中lib2to3.refactor._detect_future_features方法的典型用法代码示例。如果您正苦于以下问题：Python refactor._detect_future_features方法的具体用法？Python refactor._detect_future_features怎么用？Python refactor._detect_future_features使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类lib2to3.refactor的用法示例。
在下文中一共展示了refactor._detect_future_features方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: test_detect_future_features
# 需要导入模块: from lib2to3 import refactor [as 别名]
# 或者: from lib2to3.refactor import _detect_future_features [as 别名]
def test_detect_future_features(self):
run = refactor._detect_future_features
fs = frozenset
empty = fs()
self.assertEqual(run(""), empty)
self.assertEqual(run("from __future__ import print_function"),
fs(("print_function",)))
self.assertEqual(run("from __future__ import generators"),
fs(("generators",)))
self.assertEqual(run("from __future__ import generators, feature"),
fs(("generators", "feature")))
inp = "from __future__ import generators, print_function"
self.assertEqual(run(inp), fs(("generators", "print_function")))
inp ="from __future__ import print_function, generators"
self.assertEqual(run(inp), fs(("print_function", "generators")))
inp = "from __future__ import (print_function,)"
self.assertEqual(run(inp), fs(("print_function",)))
inp = "from __future__ import (generators, print_function)"
self.assertEqual(run(inp), fs(("generators", "print_function")))
inp = "from __future__ import (generators, nested_scopes)"
self.assertEqual(run(inp), fs(("generators", "nested_scopes")))
inp = """from __future__ import generators
from __future__ import print_function"""
self.assertEqual(run(inp), fs(("generators", "print_function")))
invalid = ("from",
"from 4",
"from x",
"from x 5",
"from x im",
"from x import",
"from x import 4",
)
for inp in invalid:
self.assertEqual(run(inp), empty)
inp = "'docstring'\nfrom __future__ import print_function"
self.assertEqual(run(inp), fs(("print_function",)))
inp = "'docstring'\n'somng'\nfrom __future__ import print_function"
self.assertEqual(run(inp), empty)
inp = "# comment\nfrom __future__ import print_function"
self.assertEqual(run(inp), fs(("print_function",)))
inp = "# comment\n'doc'\nfrom __future__ import print_function"
self.assertEqual(run(inp), fs(("print_function",)))
inp = "class x: pass\nfrom __future__ import print_function"
self.assertEqual(run(inp), empty)