Python學(xué)習(xí)之旅 讀書筆記系列

Day 13

《Python編程從入門到實踐》

復(fù)盤：第一部分基礎(chǔ)知識（第1章~11章）

今天繼續(xù)動手做練習(xí)題。

練習(xí)題

第四章 操作列表

繼續(xù)第四章練習(xí)，主要針對切片和元組

1.pizzas_qiepian.py

在原有pizza程序上添加切片操作

pizzas = ["baconic","peperoni","ham","chicago","hotpie"]
for pizza in pizzas:
    print(pizza.title())
for pizza in pizzas:
    print("I like " + pizza.title() + " pizza!")
print("I really love " + pizza.title())

print("The first three items in the list are: ")
print(pizzas[0:3])
#[x,y]x為開始的索引（含）,y為到達的索引（不含）
"""通過切片打印列表前三個元素"""
print("Three items from the middle of the list are: ")
print(pizzas[1:4])
"""通過切片打印列表中間三個元素"""
print("The last three items in the list are: ")
print(pizzas[2:5])
"""通過切片打印列表末尾三個元素"""

friend_pizzas = pizzas[0:4]
"""復(fù)制列表"""
pizzas.append("pisoln")
friend_pizzas.append("fpisoln")
print("My favorite pizzas are: ")
print(pizzas)
for pizza in pizzas:
    print("My favorite pizza are:" + pizza.title())
print("My friend's favorite pizzas are: ")
print(friend_pizzas)
for pizza in friend_pizzas:
    print("My friend's favorite pizza are: " + pizza.title())

輸出結(jié)果如下：

day13_01.png

2.tuple_retur.py

元組為不能修改的列表，注意用：圓括號不是方括號標識

retur_foods = ("cake","rabbit","banana","apple","orange")
print("Resturant's foods have 5 type: ")
for food in retur_foods:
    print(food)
#retur_foods[0] = "leomen"
"""嘗試修改元素"""
retur_foods = ("leomen","rabbit","banana","apple","watermelon")
"""修改元素變量，重新賦值"""
print("Resturant's foods have 5 type: ")
for food in retur_foods:
    print(food)

報錯時如下：

day13_02.png

后續(xù)的輸出結(jié)果如下：

day13_03.png

其他

• 注意事項
  • 切片注意X值包含，Y值不包含
  • 賦值列表通過切片時要復(fù)制，不能直接等于