字符串相关操作

连续空格去重

import re

re.sub(r'\s+', ' ', 'a b  c   d')

结果:
a b c d

格式化

s = 'hello {}'.format('zhangsan')
print(s)

s = 'hello {0}, where is {1}, {0}?'.format('zhangsan', 'lisi') 
print(s)

结果:
hello zhangsan
hello zhangsan, where is lisi, zhangsan?