def trim(str): j = 0 k = len(str) - 1 for i in range(0, len(str)): if str[i] == ' ': j = i else: break for i in range(len(str) - 1, -1, -1): if str[i] == ' ': k = i else: break str_n = str[j + 1:k] print(str_n) return str_n
trim(' abc ') '''前面3个空格，后面2个空格'''
output: abc '''空格没了'''
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霁天13
def trim(str): j = 0 k = len(str) - 1 for i in range(0, len(str)): if str[i] == ' ': j = i else: break for i in range(len(str) - 1, -1, -1): if str[i] == ' ': k = i else: break str_n = str[j + 1:k] print(str_n) return str_n
trim(' abc ') '''前面3个空格，后面2个空格'''
output: abc '''空格没了'''