将字符串重复到一定长度 [英] Repeat string to certain length

问题描述

将字符串重复到特定长度的有效方法是什么?例如: repeat('abc', 7) ->'abcabca'

What is an efficient way to repeat a string to a certain length? Eg: repeat('abc', 7) -> 'abcabca'

这是我当前的代码:

def repeat(string, length):
    cur, old = 1, string
    while len(string) < length:
        string += old[cur-1]
        cur = (cur+1)%len(old)
    return string

有没有更好(更pythonic)的方法来做到这一点?也许使用列表理解?

Is there a better (more pythonic) way to do this? Maybe using list comprehension?

推荐答案

def repeat_to_length(string_to_expand, length):
   return (string_to_expand * ((length/len(string_to_expand))+1))[:length]

对于python3:

def repeat_to_length(string_to_expand, length):
    return (string_to_expand * (int(length/len(string_to_expand))+1))[:length]

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