Create 008_String_to_Integer_(atoi).py

008_String_to_Integer_(atoi).py

@@ -0,0 +1,30 @@
+class Solution:
+    def myAtoi(self, s: str) -> int:
+        strs=s.lstrip(' _')
+        result = []
+        minus=False
+        ch=True
+        if len(strs)>=2:
+            if (strs[0]=='-' or strs[0]=='+') and (strs[1]=='-' or strs[1]=='+'):
+                return 0
+        if len(strs)==0:
+            return 0
+        if strs[0]=='+':
+            strs=strs[1:]
+            pass 
+        elif strs[0]=='-':
+            minus =True
+            strs=strs[1:]
+        for i in range(len(strs)):
+            if ord(strs[i]) in range(48,58):
+                result.append(strs[i])
+                ch=False
+            else: break
+        if ch:
+            return 0
+
+        r=''.join(result)
+        sum= int(r) if not minus else -int(r)
+        if sum > 2**31-1 or sum < -2**31:
+            return 2**31-1 if not minus else -2**31
+        else: return sum