# My Soluton Python

• here is code

``````class Solution:
# @return an integer
def atoi(self, str):
string = str
buf = ''
# our list
dg_list = ['0','1','2','3','4','5','6','7','8','9']
dg_signal = ['-','+']

signal = ''

#there is no +/- and 0-9 at first
no_signal = True
no_dig = True
#strip whitespace
for i in string.strip():

#if i in dg_signal judge:
#1:it is the first -/+ and signal = -/+, then set no_signal = False . Start to next i
#2:it it the second -/+ So it is wrong,we return 0
if i in dg_signal:
if no_signal is False:
return 0
if no_signal:
signal += i
no_signal=False
continue
#if i is 0-9, we save it to buf
if i in dg_list:
buf+=i
#but if there is a -/+, and the next char is not dig, eg:+a   here we break.
elif no_signal is False:
break
else:
#if it is not in dg_list and dg_signal,and it is also has something eg:+322a99  when i = a  and buf = +322. We jsut break a and continue
if len(buf)>0:
break
#if len(buf)<0.  eg: -a. We return as the sys tips
if len(buf)<=0:
return 0

if len(buf)>0:
buf=signal+buf

if len(buf)<=0:
return 0

f_result = int(buf)

if f_result >2147483647:
return 2147483647
if f_result<-2147483648:
return -2147483648

return f_result
``````

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