ch6-list

# -*- coding: utf-8 -*-
'''
6.1 创建列表
'''
fruit = ['apple','strawberry','pear','papaya']

toppings = []

times = ['morning','afternoon','evening','night']
# times[1]
# times[-1]

number = [1,2,5,7,9]

'''
6.2 获取有关列表的信息
'''
number = [1,2,5,7,9]
# len(number)                  获取列表中有多少项

color_list = ['red','blue','magenta','red','yellow']
# color_list.count('red')      统计列表中某各项的总数目
# color_list.count('black')

# color_list.index('blue')      返回该项在列表中第一次出现的索引位置

'pink' in color_list          #判定某项是否在列表中
'red' in color_list
'Red' in color_list
'red ' in color_list


'''
6.3 操作列表
'''
# append()用来在已有列表末尾增加一个项
toppings = []
toppings.append('pepperoni')
toppings.append('mushrooms')   #  append() takes exactly one argument

# extend()用来将一个列表加在另一个列表末尾
order1 = ['pizza','fries','baklava']
order2 = ['soda','lasagna']
order1.extend(order2)

# remove()删除第一个找到的项

# insert()在指定位置处添加一个项
colors = ['red','blue','magenta','red','yellow']
colors.insert(1,'orange')

'''
6.4 列表中使用数学运算
'''
a = [1,2,3]
b = [6,8,9]
c = a+b         # 前后相连
d = a*3         # 重复多次

'''
6.5  排序列表
'''
times = ['morning','afternoon','evening','night']
times.reverse()         # 反转

fruit = ['apple','strawberry','pear','papaya']
fruit.sort()         # 按字母升序排序
numbers = [40.2,39.1,42,58,17,9]
numbers.sort()

mixed = times+numbers
#mixed.sort()






fruit_requested = ['apple','strawberry','pear','papaya']
fruit_bought1 = ['apple','strawberry','pear','papaya']
fruit_bought2 = ['strawberry','apple','pear','papaya']

fruit_requested == fruit_bought1 
fruit_requested == fruit_bought2