英文文档: range(stop) range(start, stop[, step]) Rather than being a function, range is actually an immutable sequence type, as documented in Ranges and Sequence Types - list, tuple, range. 根据传入的参数创建一个新的 range 对象 说明: 1. range函数用于生成一个range对象,range类型是一个表示整…
英文文档: range(stop) range(start, stop[, step]) Rather than being a function, range is actually an immutable sequence type, as documented in Ranges and Sequence Types — list, tuple, range. 说明: 1. range函数用于生成一个range对象,range类型是一个表示整数范围的类型. 2. 可以直接传入一个结束整数…
map:会根据提供的函数对指定序列做映射. map(func, *iterables) --> map object Make an iterator that computes the function using arguments from each of the iterables. Stops when the shortest iterable is exhausted. """ 根据提示,map有一个函数名参数还有个动态参数,意思是将可迭代的对象打散然后把…
官方手册中: 类似函数还有两个:ltrim() 和 rtrim().分别处理字符串的左侧.右侧. trim()的具体实现位于:ext/standard/string.c /* {{{ proto string trim(string str [, string character_mask]) Strips whitespace from the beginning and end of a string */ PHP_FUNCTION(trim) { php_do_trim(INTERNAL_…