Function/Method Paramet ers lower_with_under Local Variables lower_with_under Main 即使是一个打算被用作脚本的文件, 也应该是可导入的. 并且简单的导入不应该导致这个脚本的主功能(main functiona lity)被执行, 这是一种副作用. 主功能应该放在一个main()函数中. 在Python中, pydoc以及单元测试要求模块必须...
They are fine with some caveats. Avoid nested functions or classes except when closing over a local value other thanselforcls. Do not nest a function just to hide it from users of a module. Instead, prefix its name with an _ at the module level so that it can still be accessed by t...
from __future__ import absolute_import from __future__ import division from __future__ import print_function 如果你不太熟悉这些,详细阅读这些:绝对import,新的/除法行为,和print函数 请勿省略或移除这些import,即使在模块中他们没有在使用,除非代码只用于Python3.最好总是在所有的文档中都有从future的impor...
# Arguments on first line forbidden when not using vertical alignment. foo = long_function_name(var_one, var_two, var_three, var_four) # Further indentation required as indentation is not distinguishable. def long_function_name( var_one, var_two, var_three, var_four): print(var_one) 1...
foo=long_function_name(var_one,var_two,var_three,var_four) 当if语句的条件部分足够长,需要跨多行编写时,值得注意的是,两个字符的关键字(即 if),加上一个空格,再加上一个开括号,会为多行条件的后续行创建一个自然的4个空格缩进。这可能会在if语句内嵌的缩进代码块的可视上产生冲突,后者也会自然地缩进...
foo = long_function_name( var_one, var_two, var_three, var_four) 如果if后面的表达式太长了要换行,"if ("(if加空格加左圆括号)自动形成了一个4空格缩进,对其他2个字符的关键字同理。(注意到这里是用的小括号的隐式续行)。这可能会和if后面跟的语句进行的一个缩进造成视觉上的混淆,PEP 8没有明确...
for xinlong_generator_function(parameter) if xisnotNone) squares=[x* xfor xinrange(10)] eat(jelly_beanfor jelly_beanin jelly_beans ifjelly_bean.color=='black') 默认迭代器和操作符 如果类型支持,就使用默认迭代器和操作符.比如列表、字典及文件等。
(10):foryinrange(5):ifx*y>10:result.append((x,y))return{x:complicated_transform(x)forxinlong_generator_function(parameter)ifx is not None}squares_generator=(x**2forxinrange(10))unique_names={user.nameforuserinusersifuser is not None}eat(jelly_beanforjelly_beaninjelly_beansifjelly_bean...
# This is a commentprint("hello world") 任何命令行输入或输出都按照以下格式编写: $ python Python2.7.12(default, Dec42017,14:50:18) [GCC5.4.020160609] on linux2Type"help","copyright","credits"or"license"formore information.>>>exit() ...
Python also ignores the blank line after the comment. You can add as many blank lines to your program as you want. This can make your code easier to read, like paragraphs in a book. The print() Function The print() function displays the string value inside the parentheses on the scree...