Python列表删除的三种方法代码分享
1、使用del语句删除元素
>>> i1 = ["a",'b','c','d'] >>> del i1[0] >>> print(i1) ['b', 'c', 'd'] >>>
del语句将值从列表中删除后,就再也无法访问它了。
2、使用pop()删除元素
pop()可删除列表末尾的元素,并让你能够接着使用它。食欲弹出(pop)源自这样的类比:列表就是一个栈,而删除列表末尾的元素相当于弹出栈顶元素。
>>> i1 = ['cai','rui','headsome'] >>> i2 = i1.pop() >>> print(i1) ['cai', 'rui'] >>> print(i2) headsome >>>
作用:假设列表中的摩托车是按照购买时间存储的,就可以使用方法pop()打印一条消息,指出最后购买的是哪款摩托车:
#!/usr/bin/env python motorcycles = ['honda','yamaha','suzuki'] last_owned = motorcycles.pop() print("The last motorcycle i owned was a " + last_owned.title() + '.') ================================ The last motorcycle i owned was a Suzuki.
弹出列表中任何位置处的元素:
#!/usr/bin/env python motorcycles = ['honda','yamaha','suzuki'] last_owned = motorcycles.pop(0) print("The last motorcycle i owned was a " + last_owned.title() + '.') ======================================== The last motorcycle i owned was a Honda.
3、remove 根据值删除元素
motorcycles = ['honda','yamaha','suzuki'] motorcycles.remove('yamaha') print(motorcycles) ==================================== ['honda', 'suzuki']
注意:remove()只删除一个指定的值。如果要删除的值可能在列表中出现多次,就需要使用循环来判断是否删除了所有的值。
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