几年后更新：Python 3.6现在支持PEP515，因此您可以使用_来提高浮点数和整数文字的可读性。
Python 3.6.1 (v3.6.1:69c0db5, Mar 21 2017, 18:41:36) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> 1_1000
11000
>>>
作为历史参考，您可以查看严格定义python2.7，python3.5 …的词法分析。
对于python3.6.0a2及更早版本，您应该收到类似于以下内容的错误消息：
Python 3.6.0a2 (v3.6.0a2:378893423552, Jun 13 2016, 14:44:21)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 1_000
File "<stdin>", line 1
1_000
^
SyntaxError: invalid Syntax
>>> amount = 10_000_000.0
File "<stdin>", line 1
amount = 10_000_000.0
^
SyntaxError: invalid Syntax
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