python from import：别让模块前缀卡住你的π，一针见血

比如我们导入一个数学计算的模块 math math print math print math.pi #导出圆周率的值3.我们将math模块进行导入, 在针对模块展开的学习过程当中, 我们能够知晓, 通过这般行事会获取得到名为math的对象, 这个于模块范畴呈现的对象涵盖了诸如pi之类的常量, 以及另外一部分别的方法。当我们直接去访问pi时, 若不加上math这个前缀, 那么会出现什么样的情况呢。 print pi (most call last): File , line 1, in print pi : name pi is not 程序抛出了一个名为空的错误, 如此这般的错误处理该如何去解决呢? 在这个当口, 我们能够运用from这个办法来达成, 可以径直采用pi这个办法: from math pi print pi 3.9793 能够直接输出pi的值, 如此这般, 不会出现错谬, 无需添加那个模块名, 加上句号便是如此这般了。存在这样一部分朋友认为这或许仍旧是颇为繁杂的, 有没有那种能够更为迅速、更加简便省事的模块导入方式呢?答案是还真有。 from math * pi 3.9793 cos(pi) -1.0 那么, 就没必要存在一个如同引入模块内部那般的方法了, 而是改成把所有调用函数方法一次性进行导入, 其好处在于代码看上去极为简洁, 然而要是同时导入多个模块, 就得去考量模块方法名冲突这类问题, 至于具体如何使用, 这得取决于你的使用环境。总之, 从模块利用从某种方式调取, 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