auto save

2-4-diy1.py

+username = "python"
+userpassword = "123456"
+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!")
\ No newline at end of file

2-4-diy2.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
+    print("用户名和密码错误!请重新输入")
+print("欢迎来到贝尔编程!")
\ No newline at end of file

2-4-diy3.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
+    if name != username:
+        print("用户名不存在,请重新输入!")
+    if password != userpassword:
+        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

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

2-4-diy4.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
+    if name != username:
+        print("用户名错误,请重新输入!")
+        continue
+    if password != userpassword:
+        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

2-4-diy5.py

+i = 3
+username = "python"
+userpassword = "123456"
+while True:
+    if i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i -= 1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name != username:
+            print("用户名错误,请重新输入!")
+            continue
+        if password != userpassword:
+            print("密码输入有误,请重新输入!")
+    else:
+        print("你的账户已被锁定，请一个小时以后再来")
+        exit()
+print("欢迎来到贝尔编程!")
\ No newline at end of file

2-4-diy6.py

+i = 3
+username = "python"
+userpassword = "123456"
+while True:
+    if i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i -=1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name != username:
+            print("用户名错误,请重新输入!")
+            print("温馨提示:您还有"+str(i)+"次登录机会")
+            continue
+        if password != userpassword:
+            print("密码输入有误,请重新输入!")
+            print("温馨提示:您还有" + str(i) + "次登录机会")
+    else:
+        print("你的账户已被锁定，请一个小时以后再来")
+        exit()
+print("欢迎来到贝尔编程!")
\ No newline at end of file

2-5-diy2.py

+import turtle
+
+pen=turtle.Pen()
+for i in range(1,300):
+    pen.forward(i)
+    pen.right(91)
+pen.hideturtle()
+turtle.done()
\ No newline at end of file

2-5-diy3.py

+import turtle
+
+pen = turtle.Pen()
+colors=["red","orange","yellow","green"]
+for i in range(1,300):
+    pen.forward(i)
+    pen.pencolor(colors[i%4])
+    pen.right(91)
+turtle.done()
\ No newline at end of file

2-5-diy5.py

+j = 3   # 列
+i = 5   # 行
+print(j, '*', i,'=', (j * i))
\ No newline at end of file

2-5-diy6.py

+i=1
+for j in range(1,10):
+    print(j, '*', i,'=', (j * i), end="  ")
\ No newline at end of file

2-5-diy7.py

+for i in range(1, 10):
+    for j in range(1, 10):
+        print(j, '*', i, '=', (j * i), end='  ')
+    print()
\ No newline at end of file

2-5-diy8.py

+for i in range(1, 10):
+    for j in range(1, i+1):
+        print(j, '*', i, '=', (j * i), end='  ')
+    print()
\ No newline at end of file