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
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