python基础之操作列表
2024-09-06 09:45:15
遍历元素
magicians = ['alice','david','carolina']
for magician in magicians:
print(magician)
magicians = ['alice','david','carolina']
for magician in magicians:
print(magician.title() + ", that was a great trick")
print("Thank you, everyone. That was a great magic show")
遍历数字
range()生成一系列数字
for value in range(1,5):
print(value)
创建数字列表
number = list(range(1,6))
print(number)
number = list(range(2,11,2)) #创建从2开始相差为2的数字并不超过11
print(number)
squares = []
for value in range(1,11):
square = value ** 2 #平方数
squares.append(square)
print(squares)
数字列表统计
digits = [1,2,3,4,5,6,7,8,9,0]
print(min(digits)) #最小值
print(max(digits)) #最大值
print(sum(digits)) #求和值
列表解析
squares = [value**2 for value in range(1,11)]
print(squares)
切片
注意：数字是从0开始数
players = ['charles','martina','michael','florence','eli']
print(players[0:3]) #从第一个到第三个
players = ['charles','martina','michael','florence','eli']
print(players[:3]) #从第一个到第三个
players = ['charles','martina','michael','florence','eli']
print(players[2:]) #从第三个到最后一个
players = ['charles','martina','michael','florence','eli']
print(players[-3:]) #输出最后三个数字
url = list("0123456789")
print(url[0:10:2]) # 指定正序的间隔为2
print(url[-1:-10:-2]) #指定倒序的间隔为2
print(url[::-1]) # 倒序
print(url[-3:-1]) # 使用负数切片
遍历切片
players = ['charles','martina','michael','florence','eli']
for player in players[:3]:
print(player)
复制列表
my_foods = ['pizza','falafel','carrot cake']
friend_foods = my_foods[:]
my_foods.append('cannoli')
friend_foods.append('ice cream')
print(my_foods)
print(friend_foods)
注意：
my_foods = ['pizza','falafel','carrot cake']
friend_foods = my_foods #不能这样直接赋值
my_foods.append('cannoli')
friend_foods.append('ice cream')
print(my_foods)
print(friend_foods)
遍历元组
元组是不能修改的列表，因此不能随意更改元组里的元素
dimensions = (200,50)
for dimension in dimensions:
print(dimension)
元组赋值
虽然不能修改元组的元素，但可以给元组的变量赋值
dimensions = (200,50)
for dimension in dimensions:
print(dimension)
dimensions = (400,100)
for dimension in dimensions:
print(dimension)
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