Create custom-atoi.py

Not the most efficient solution but a fine solution for a custom string to int conversion tool satisfying all constraints

custom-atoi.py

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+class Solution(object):
+    def myAtoi(self, s):
+        """
+        :type s: str
+        :rtype: int
+        """
+        start = 99999
+        flipper = 1
+        temp = ""
+        final = 0
+        for i,char in enumerate(s):
+            if i < start and char == "-":
+                flipper = -1
+                start = i
+            elif i < start and char == "+":
+                flipper = 1
+                start = i
+            elif i < start and char in "1234567890":
+                temp += char
+                start = i
+            elif i < start and char != " ":
+                return 0
+            elif i > start and char not in "1234567890":
+                break
+            else:
+                temp += char
+        length = len(temp)
+        #print(temp)
+        for j in range(length):
+            final += 10**(length-j-1) * self.chtoi(temp[j])
+            #print(self.chtoi(temp[j]))
+        if flipper == 1:
+            final = min(final, 2147483647)
+        else:
+            final = min(final, 2147483648)
+        return final * flipper
+
+    def chtoi(self, ch):
+        numbers = "9876543210"
+        realnums = [9,8,7,6,5,4,3,2,1,0]
+        return realnums[numbers.find(ch)]
+
+