编写一个 function 打印字符串中第一个空格后的第一个单词

Question

Programming Challenge 5: Write a Python function called secondword. The function should take a single input that will be a string. If there is no space character in the string, the function should output an empty string (a string with no characters between the quotes). If there is a single space character in the string, the function should output a string containing the slice of the input string that is after that space. If there are two or more space characters in the string, the output should be the slice of the input string after the first space up to but not including the second space.

For example:

secondword("United")
should return ''
second word("United States")
should return 'States'
secondword("United States of America")
should return 'States'

Answer 1

Easily done with re - good luck with the challenge

import re
def secondword(s):
    p = r' ([^ ]*)'
    m = re.search(p, s)
    return m[1] if m else ''