# l=[1,2,3] #l=list([1,2,3])
# print(type(l))
#优先掌握
# 索引
#
# 切片
l=['a','b','c','d','e','f']
# print(l[1:5])
# print(l[1:5:2])
# print(l[2:5])
# print(l[-1])
#了解
# print(l[-1:-4])
# print(l[-4:])
# l=['a','b','c','d','e','f']
# print(l[-2:])
# 追加
# hobbies=['play','eat','sleep','study']
# hobbies.append('girls')
# print(hobbies)
# 删除
hobbies=['play','eat','sleep','study']
# x=hobbies.pop(1) #不是单纯的删除，是删除并且把删除的元素返回，我们可以用一个变量名去接收该返回值
# print(x)
# print(hobbies)
# x=hobbies.pop(0)
# print(x)
#
# x=hobbies.pop(0)
# print(x)
#队列：先进先出
queue_l=[]
#入队
# queue_l.append('first')
# queue_l.append('second')
# queue_l.append('third')
# print(queue_l)
#出队
# print(queue_l.pop(0))
# print(queue_l.pop(0))
# print(queue_l.pop(0))
#堆栈:先进后出，后进先出
# l=[]
# #入栈
# l.append('first')
# l.append('second')
# l.append('third')
# #出栈
# print(l)
# print(l.pop())
# print(l.pop())
# print(l.pop())
#了解
# del hobbies[1] #单纯的删除
# hobbies.remove('eat') #单纯的删除，并且是指定元素去删除
# 长度
# hobbies=['play','eat','sleep','study']
# print(len(hobbies))
# 包含in
# hobbies=['play','eat','sleep','study']
# print('sleep' in hobbies)
# msg='hello world egon'
# print('egon' in msg)