python中字符串乘法_Python – 如何在字符后用字符串乘以字符串中的字符

这是一种简单的方法：

string = 'A3G3A'

expanded = ''

for character in string:

if character.isdigit():

expanded += expanded[-1] * (int(character) - 1)

else:

expanded += character

print(expanded)

输出：AAAGGGA

它假定有效输入.它的局限性在于重复因子必须是单个数字,例如2 – 9.如果我们想要重复因子大于9,我们必须对字符串进行稍微解析：

from itertools import groupby

groups = groupby('DA10G3ABC', str.isdigit)

expanded = []

for is_numeric, characters in groups:

if is_numeric:

expanded.append(expanded[-1] * (int(''.join(characters)) - 1))

else:

expanded.extend(characters)

print(''.join(expanded))

输出：DAAAAAAAAAAGGGABC