string to integer

"""
Clamp the result to the 32-bit signed integer range [−2^31, 2^31 − 1] because the problem restricts outputs to this limit. Even though Python supports arbitrary-size integers, we manually enforce overflow boundaries to match standard integer constraints.
"""
class Solution:
    def myAtoi(self, s: str) -> int:
        s=s.lstrip()
        if not s:
            return 0
        sign=1
        sign= -1 if s[0]=='-' else 1
        s=s[1:] if s[0] in '+-' else s[0:]
        ans=0
        print(s)
        for i in s:
            if i.isdigit():
                print(int(i))
                ans=ans*10+int(i)
            else:
                break

        return max(-pow(2,31),min(pow(2,31)-1,sign*ans)) # a big positive number will come down in range by min(pow(2,31-2,sign*ans)) and a big negative number will come in range by max(-pow(2,31),ans)