def range_difference(qwer):
i=0
largest = 0
smallest = 0
if type(qwer)!=list and type(qwer)!=tuple:
return None
if len(qwer)<=1:
return None
while i<len(qwer):
temp = int(qwer[i])
if i==0:
largest=smallest=temp
if temp<smallest:
smallest=temp
if temp>largest:
largest=temp
i+=1
range=largest-smallest
return range
ValueError: invalid literal for int() with base 10: 'hello'
这个报错怎么修正