Python编程 从入门到实践-3列表下

笔记出处(学习UP主视频记录) https://www.bilibili.com/video/av35698354?p=5

3.2.3 从列表中删除元素-使用del语句删除元素

motorcycles = ['honda', 'yamaha', 'suzuki']
print (motorcycles)

del motorcycles[0]
print (motorcycles)

['honda', 'yamaha', 'suzuki']
['yamaha', 'suzuki']

motorcycles = ['honda', 'yamaha', 'suzuki']
print (motorcycles)

del motorcycles[1]
print (motorcycles)

['honda', 'yamaha', 'suzuki']
['honda', 'suzuki']

3.2.3 从列表中删除元素-使用方法pop()删除元素

motorcycles = ['honda', 'yamaha', 'suzuki']
print (motorcycles)

poped_motorcycle = motorcycles.pop()
print (motorcycles)

print (poped_motorcycle)

['honda', 'yamaha', 'suzuki']
['honda', 'yamaha']
suzuki

3.2.3 从列表中删除元素-弹出列表中任何位置处的元素

motorcycles = ['honda', 'yamaha', 'suzuki']

first_owned = motorcycles.pop(0)
print ('The first motorcycle I owned was a ' + first_owned.title() + '.')

The first motorcycle I owned was a Honda.

3.2.3 从列表中删除元素-根据值删除元素

motorcycles = ['honda', 'yamaha', 'suzuki', 'ducati']
print (motorcycles)

motorcycles.remove('ducati')
print (motorcycles)

['honda', 'yamaha', 'suzuki', 'ducati']
['honda', 'yamaha', 'suzuki']

3.3 组织列表

3.3.1 方法sort()对列表进行永久性排序

cars = ['bmw', 'audi', 'toyota', 'subary']

cars.sort()
print (cars)

['audi', 'bmw', 'subary', 'toyota']

cars = ['bmw', 'audi', 'toyota', 'subary']

cars.sort(reverse=True)
print (cars)

['toyota', 'subary', 'bmw', 'audi']

3.3.2 函数sorted()对列表进行临时排序

cars = ['bmw', 'audi', 'toyota', 'subary']

print ("Here is the origin list: ")
print (cars)

print ("\nHere is the sorted list: ")
print (sorted(cars))

print ("\nHere is the original list again: ")
print (cars)

Here is the origin list:
['bmw', 'audi', 'toyota', 'subary']

Here is the sorted list:
['audi', 'bmw', 'subary', 'toyota']

Here is the original list again:
['bmw', 'audi', 'toyota', 'subary']

3.3.3 方法reverse()倒着打印列表

cars = ['bmw', 'audi', 'toyota', 'subary']
print (cars)

cars.reverse()
print (cars)

['bmw', 'audi', 'toyota', 'subary']
['subary', 'toyota', 'audi', 'bmw']

3.3.4 函数len()确定列表的长度

cars = ['bmw', 'audi', 'toyota', 'subary']

print (len(cars))

4

3.4 使用列表时避免索引错误

motorcycles = ['honda', 'yamaha', 'suzuki']
print (motorcycles[3])

print (motorcycles[3])
IndexError: list index out of range