Recently, I have encountered many List operations. I feel that it is a very important basic data structure, and what I have mastered is not very solid. Here I find some List operations, common functions, and record them. I hope they will be useful to you. If there is any deviation in understanding, please correct it. Thank you!

(1) Merge of lists

Used: +, append(), extend(), insert()

# -*- coding: utf-8 -*-
"""
Created on Tue Aug  7 20:10:41 2018
@author: brave-man
blog: http://www.cnblogs.com/zrmw/
"""

a = [123, 'abc', 12.3, 'lao zhang']
b = ['lao li', 'lao wang', 'lao liu']

print(a + b)

a.extend(b)
print(a)

a.insert(0, b)
print(a)

a.append(b)
print(a)

Output:

[123, 'abc', 12.3, 'lao zhang', 'lao li', 'lao wang', 'lao liu']
[123, 'abc', 12.3, 'lao zhang', 'lao li', 'lao wang', 'lao liu']
[['lao li', 'lao wang', 'lao liu'], 123, 'abc', 12.3, 'lao zhang', 'lao li', 'lao wang', 'lao liu']
[['lao li', 'lao wang', 'lao liu'], 123, 'abc', 12.3, 'lao zhang', 'lao li', 'lao wang', 'lao liu', ['lao li', 'lao wang', 'lao liu']]

(2) Deletion and deep copy of list, assignment

Using the function: remove(), pop(), del

# -*- coding: utf-8 -*-
"""
Created on Tue Aug  7 20:10:41 2018
@author: brave-man
blog: http://www.cnblogs.com/zrmw/
"""

import copy

a = [123, 'abc', 12.3, 'lao zhang']
b = ['lao li', 'lao wang', 'lao liu']
f = ['aabbcc', 223344]

# Assignment, binding the same object, will change the original list
c = a
print(c.pop())
print('a', a)
print('c', c)
print(a is c)

# Shallow copy, only copy the deepest objects, and operate on new variables
# The original list will not be affected
d = b.copy()
d.remove('lao li')
print('b', b)
print('d', d)
print(b is d)

# Deep copy, which copies each layer of the original list in memory and becomes a new
# List, the operation on the new list will not affect the original list
e = copy.deepcopy(f)
print('e', e)
del e[0]
print('f', f)
print('e', e)
print(e is f)

Output:

lao zhang
a [123, 'abc', 12.3]
c [123, 'abc', 12.3]
True
b ['lao li', 'lao wang', 'lao liu']
d ['lao wang', 'lao liu']
False
e ['aabbcc', 223344]
f ['aabbcc', 223344]
e [223344]
False