Three methods for deleting the Python list: code sharing and python

Three methods for deleting the Python list: code sharing and python

1. Use the del statement to delete an element.

>>> i1 = ["a",'b','c','d'] >>> del i1[0]>>> print(i1)['b', 'c', 'd']>>>

After the del statement deletes a value from the list, it will no longer be accessible.

2. Use pop () to delete Elements

Pop () deletes the element at the end of the list and allows you to continue using it. Appetite pop comes from the analogy that a list is a stack, and deleting the elements at the end of the list is equivalent to popping up the top elements of the stack.

>>> i1 = ['cai','rui','headsome']>>> i2 = i1.pop()>>> print(i1)['cai', 'rui']>>> print(i2)headsome>>>

Purpose: assume that the motorcycles in the list are stored based on the purchase time, you can use pop () to print a message, indicating which motorcycle was last purchased:

#!/usr/bin/env pythonmotorcycles = ['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.

The following elements are displayed at any position in the list:

#!/usr/bin/env pythonmotorcycles = ['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 delete an element by value

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

Note: remove () only deletes a specified value. If the value to be deleted may appear multiple times in the list, you need to use a loop to determine whether all values have been deleted.

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