"Python Programming Quick Start" 7.18.2 practical exercises

# -*- coding:utf-8 -*-#strip正则表达式#if 只字符串，不带参数，去首尾空白#else 去除参数text=input("Input a text:")import redef st(text): #原样返回检测 textReg=re.compile(r"^\w+$") #前后或前或后，空白检测 blankReg=re.compile(r‘^\s+(\w+)\s+$|^\s+(\w+)|(\w+)\s+$‘) check_blank=blankReg.search(text) #参数检测 argsReg=re.compile(r‘(\w+)\s+\.*‘) check_args=argsReg.search(text) if textReg.search(text): return(text) elif check_blank: #groups检测，直接通过groups输出 for i in check_blank.groups(): if i: return(i) elif check_args: return(check_args.group(1)) else: return("wrong")print(st(text))

"Python Programming Quick Start" 7.18.2 practical exercises