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  • The Python Tutorial 4. More Control Flow Tools的一些小记

      4.7.5. Lambda Forms

    By popular demand, a few features commonly found in functional programming languages like Lisp have been added to Python. With the lambda keyword, small anonymous functions can be created. Here’s a function that returns the sum of its two arguments: lambda a, b: a+b. Lambda forms can be used wherever function objects are required. They are syntactically restricted to a single expression. Semantically, they are just syntactic sugar for a normal function definition. Like nested function definitions, lambda forms can reference variables from the containing scope:

    关键字,用来创建小的匿名函数

    语法上限制单个表达式。其实和内嵌函数定义差不多

    >>> def make_incrementor(n):
    ...     return lambda x: x + n
    ...
    >>> f = make_incrementor(42)
    >>> f(0)
    42
    >>> f(1)
    43
    

    4.7.6. Documentation Strings

    其实就是对函数或者模块的说明

    Here is an example of a multi-line docstring:

    >>> def my_function(): ... """Do nothing, but document it. ... ... No, really, it doesn't do anything. ... """ ... pass ... >>> print my_function.__doc__ Do nothing, but document it. No, really, it doesn't do anything.
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  • 原文地址:https://www.cnblogs.com/nickchan/p/3104528.html
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