将字符串重复到一定长度的有效方法是什么?例: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
有没有更好的(更python化的)方法来做到这一点?也许使用列表理解?
当前回答
from itertools import cycle, islice
def srepeat(string, n):
return ''.join(islice(cycle(string), n))
其他回答
from itertools import cycle, islice
def srepeat(string, n):
return ''.join(islice(cycle(string), n))
这是非常python的:
newstring = 'abc'*5
print newstring[0:6]
另一种FP方法:
def repeat_string(string_to_repeat, repetitions):
return ''.join([ string_to_repeat for n in range(repetitions)])
def repeat_to_length(string_to_expand, length):
return (string_to_expand * ((length/len(string_to_expand))+1))[:length]
python3:
def repeat_to_length(string_to_expand, length):
return (string_to_expand * (int(length/len(string_to_expand))+1))[:length]
def rep(s, m):
a, b = divmod(m, len(s))
return s * a + s[:b]
