There is PEP 8, as other answers show, but PEP 8 is only the styleguide for the standard library, and it's only taken as gospel therein. One of the most frequent deviations of PEP 8 for other pieces of code is the variable naming, specifically for methods. There is no single predominate style, although considering the volume of code that uses mixedCase, if one were to make a strict census one would probably end up with a version of PEP 8 with mixedCase. There is little other deviation from PEP 8 that is quite as common.

参见Python PEP 8:函数和变量名:

函数名应该是小写的，单词之间用下划线分隔，以提高可读性。 变量名遵循与函数名相同的约定。 mixedCase只允许在已经是流行风格的上下文中使用(例如threading.py)，以保持向后兼容性。

David Goodger(在这里的“像Pythonista一样编码”中)描述了PEP 8的建议如下:

Joined_lower函数，方法， 属性、变量 joined_lower或ALL_CAPS for 常量 课程用的studlycap 骆驼案只符合 已有的约定

@JohnTESlade的回答更进一步。谷歌的python风格指南有一些非常简洁的建议，

避免使用的名字

除计数器或迭代器外的单字符名称 在任何包/模块名称中使用破折号(-) \ __double_leading_and_trailing_下划线名称(由Python保留)

命名约定

"Internal" means internal to a module or protected or private within a class. Prepending a single underscore (_) has some support for protecting module variables and functions (not included with import * from). Prepending a double underscore (__) to an instance variable or method effectively serves to make the variable or method private to its class (using name mangling). Place related classes and top-level functions together in a module. Unlike Java, there is no need to limit yourself to one class per module. Use CapWords for class names, but lower_with_under.py for module names. Although there are many existing modules named CapWords.py, this is now discouraged because it's confusing when the module happens to be named after a class. ("wait -- did I write import StringIO or from StringIO import StringIO?")

指南源自圭多的建议

谷歌Python风格指南有以下约定:

module_name, package_name, ClassName, method_name, ExceptionName, function_name, GLOBAL_CONSTANT_NAME, global_var_name, instance_var_name, function_parameter_name, local_var_name。

CLASS_CONSTANT_NAME应该应用类似的命名方案

通常，要遵循语言标准库中使用的约定。