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01/8.py

+class Solution:
+    def myAtoi(self, str):
+        """
+        :type str: str
+        :rtype: int
+        """
+        str = str.strip()
+        number = ""
+        
+        
+        for x in str:
+            if x.isalpha() and number == "":
+                return 0
+            elif x.isalpha():
+                break
+            elif x == ".":
+                break
+            elif x == " ":
+                break
+            elif (x == "+" or x == "-") and number == "":
+                number = number + x
+            elif (x == "+" or x == "-") and number != "":
+                break
+            elif (x == "+" or x == "-") and (number[-1] == "+" or number[-1] == "-"):
+                return 0
+            elif (x == "+" or x == "-") and ("+" in number or "-" in number):
+                break
+            elif x.isdigit():
+                number = number + x
+        if number == "" or number == "+" or number == "-":
+            return 0
+        else:
+            if int(number) > ((2**31)-1):
+                return (2**31)-1
+            elif int(number) < -(2**31):
+                return -(2**31)
+            else:
+                return int(number)
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