auto save

diy2.py

+username="python"
+userpassword="123456"
+while True:
+    name=input("名")
+    password=input("密")
+    if name==username and password==userpassword:
+        print("OK")
+        break
+    if name!=username :
+        print("名错")
+        continue
+    if  password!=userpassword:
+        print("密错")
+print("欢迎")
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