How to use list comprehension in python

Python uses the list derivation method: 1. It is used to create a new list using other lists; 2. It can transform and filter the original list; 3. Transform and filter multiple nested lists.

How to use list comprehensions in python:

List comprehensions in python are used to create a list using other lists New list.

The basic form is: [Expression for variable in list]

For example:

# 想得到1-10的平方组成的list
list_1_10 = [x**2 for x in range(1,11)]
print(list_1_10)

The output is:

A more complex list expression can transform and filter the original list.

For example:

# 想得到1-10中为偶数的平方组成的list
example = [i**2 for i in range(1,11) if i%2 == 0 ]
print(example)

The output is:

and transform and filter multiple nested lists.

For example:

# 想得到多重嵌套中的数是2的倍数的平方组成的list
example2 = [[1,2,3],[4,5,6],[7,8,9],[10]]
example3 = [j**2 for i in example2 for j in i if j%2 == 0]
print(example3)

The output is:

For example:

# 想得到多重嵌套的list中一重嵌套中list长度大于1的list中的数为2的倍数的平方组成的list
example4 = [[1,2,3],[4,5,6],[7,8,9],[10]]
exmaple5 = [j**2 for i in example2 if len(i)>1 for j in i if j%2 == 0]
print(exmaple5)

The output is:

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