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    1.
    ABE
    2.

    1. a = 6
    2. b = 8
    3. a1 = a
    4. b1 = b
    5. a = b1
    6. b = a1
    7. print(a)
    8. print(b)

    3.

    1. tel = input('请输入你的电话号码')
    2. if tel.isdigit() == True:
    3.     print(tel)
    4. else:
    5.     print('请输入正确的电话号码')

    4.

    1. print('hello', 'world', sep='\n')