python - 引數檢測isinstance
阿新 • • 發佈:2018-12-21
引數檢測isinstance:
def add(x, y):
if isinstance(x, (int, float)) and isinstance(y, (int, float)):
# x,y只能是int或float
return x + y
else:
print('Error:')
res = add(2.5,2)
print(res)
輸出:
4.5
將輸入引數變為字串型
練習
編寫函式,計算字串匹配的準確率(字母相同的個數佔第一句的多少百分比)
1.只能是字串型
2.第一句不能比第二句短
def Rate(orgin,userInput): if not (isinstance(orgin,str) and isinstance(userInput,str)): print('The tow parameters must be string') return # 返回空 if len(orgin) < len(userInput): print('Sorry.') return right = 0 for orgin_char,user_char in zip(orgin,userInput): if orgin_char == user_char: right += 1 return right/len(orgin) a = 'have a nice day' b = 'Have b aaaa DAy' print(Rate(a,b))