python学习笔记（一）—— 列表

列表练习

name = ["Jane","Max","Mack"]
print(name[0],name[1],name[2])
print(name[0] + ". Nice to meet you !")

追加元素

names = []
names.append("May")
names.append("Tony")
print(names)

插入元素，需要指定新元素的索引和值

names = ["Jane","Max","Mack"]
names.insert(1,"Tom")
print(names)

删除（del语句）

names = ["Jane","Max","Mack"]
del names[2]
print (names)

删除（pop()方法，弹出末尾元素）

names = ["Jane","Max","Mack"]
names.append("Tony")
print(names)
popped_name = names.pop()
print(names)
print(popped_name)

删除（pop(i)，弹出列表中指定位置的元素）

names_new = ["Jane","Max","Mack"]
second_people = names_new.pop(1)
print("Second people is " + second_people)

删除（remove方法，根据值删除元素）

names_new = ["Jane","Max","Mack"]
names_new.remove("Jane")
print(names_new)

永久排序（sort()方法）

cars = ["bwm","audi","toyota"]
#字母正序
cars.sort()
print(cars)
#字母倒序
cars.sort(reverse=True)
print(cars)

临时排序（sorted()函数）

cars = ["bwm","audi","toyota"]
print(sorted(cars))
print(sorted(cars,reverse=True))
print(cars)

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倒着打印列表

cars = ["bwm","audi","toyota"]
cars.reverse()
print(cars)

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获取列表长度

cars = ["bwm","audi","toyota"]
print(len(cars))

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使用for循环获取列表中所有元素

cars = ["bwm","audi","toyota"]
for car in cars:
    print(car)

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创建列表

#创建数字列表
numbers = list(range(1,6))
print(numbers)
even_numbers = list(range(2,11,2))
print(even_numbers)


#创建列表，包含前十个整数的平方
squares = []
for value in range(1,11):
    squares.append(value**2)
print(squares)

利用切片复制列表
 

list1 = ["a","b","c","d"]
list2 = list1[:]
list1.append("e")
list2.append("f")
print(list1,list2)
print("The firt three items in the list are: " )
for item in list1[-2:]:
    print(item)