列表

name1 = 'Michael'
name2 = 'Bob'
classmates = ['Michael','Bob','Tracy',12]
classmates.append('Rose')
classmates.insert(1,'Jack')

classmates.pop()
classmates.pop(4)
classmates[0] = 'Rose'
print(len(classmates),classmates)

4 ['Rose', 'Jack', 'Bob', 'Tracy']

Process finished with exit code 0

　　

name1 = 'Michael'
name2 = 'Bob'
classmates = ['Michael','Bob','Tracy',12]
classmates.append('Rose')
classmates.insert(1,'Jack')

classmates.pop()
classmates.pop(3)
classmates[0] = 'Rose'
print(len(classmates),classmates)

　　

4 ['Rose', 'Jack', 'Bob', 12]

Process finished with exit code 0

　　

name1 = 'Michael'
name2 = 'Bob'
classmates = ['Michael','Bob','Tracy',12]
classmates.append('Rose')
classmates.insert(1,'Jack')

classmates.pop()
classmates.pop(2)
classmates[0] = 'Rose'
print(len(classmates),classmates)

　　

4 ['Rose', 'Jack', 'Tracy', 12]

Process finished with exit code 0