save project

diy2.py

+username = "python"
+userpassword = "123456"
+i=0
+while True:
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        i=1
+        break
+    if name != username:
+        i=2
+        break
+    if password != userpassword:
+        i=3
+        break
+    if name != username and password != userpassword:
+        i=4
+        break
+if i==1:
+    print("登录成功!")
+    print("欢迎来到贝尔编程!")
+if i==2:
+    print("1")
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        i=1
+    if name != username:
+        i=2
+    if password != userpassword:
+        i=3
+    if name != username and password != userpassword:
+        i=4  
+if i==3:
+    print("2")
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        i=1
+    if name != username:
+        i=2
+    if password != userpassword:
+        i=3
+    if name != username and password != userpassword:
+        i=4  
+if i==4:
+    print("1")
+    print("2")
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        i=1
+    if name != username:
+        i=2
+    if password != userpassword:
+        i=3
+    if name != username and password != userpassword:
+        i=4  
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