save project

2-4-diy4-2.py

+username = "python"
+userpassword = "123456"
+while True:
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    elif name != username:
+        print("用户名不存在,请重新输入!")
+    else:
+        print("密码输入有误,请重新输入!")
+print("欢迎来到贝尔编程!")
\ No newline at end of file

debug.py

+import turtle
+pen= turtle.Pen()
+# 第一处错误是👇，没有创建画布screen
+screen=turtle.Screen()
+size=screen.textinput("提示","你想要多大的魔法阵呀？")
+# 第二处错误是没有转换数据类型，size是字符串，需要转换为整数或浮点，才可以传递给circle()的第一个参数
+len=int(size)    #可以转换为整数
+#len=float(size) #也可以转换为浮点数
+# pen.circle(len)
+pen.circle(len,360,3)
+# pen.circle(len,60)
+# pen.circle(len,360,3)
+turtle.done()
\ No newline at end of file

diy2.py

@@ -5,5 +5,9 @@ while True:
     password = input("请输入密码:")
     password = input("请输入密码:")
     if name == username and password == userpassword:
     if name == username and password == userpassword:
         print("登录成功!")
         print("登录成功!")
-    print("用户名和密码错误!请重新输入")
+        break
+    if name!=username:
+        print("用户名错误!")
+    if userpassword!=password:
+        print("密码错误!")
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
\ No newline at end of file