字符串转整数
没什么想法!简单!
class Solution(object):
def myAtoi(self, str):
"""
:type str: str
:rtype: int
"""
strlen = len(str)
i = 0
result = 0
while i < strlen:
if str[i] == '-':
result = -int(self.numstrjoin(str,i+1))
break
if str[i] == '+':
result = int(self.numstrjoin(str,i+1))
break
elif str[i] in string.digits:
result = int(self.numstrjoin(str,i))
break
elif str[i] == ' ':
i += 1
else:
break
if result > 2147483647:
return 2147483647
elif result < -2147483648:
return -2147483648
return result
def numstrjoin(self,str,num):
result = ''
strlen = len(str)
while True:
if num<strlen and str[num] in string.digits:
result += str[num]
else:
break
num += 1
if len(result) ==0:
return '0'
return result
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