9 common ways to calculate list squared

Collect 9 common methods of calculating list square in Python:

1. Use a for loop

This method traverses each number in the list, using**The operator calculates its squared and then adds the result to the new list.

numbers = [1, 2, 3, 4, 5]
squared_numbers = []
for num in numbers:
    squared_numbers.append(num ** 2)
print(squared_numbers)

2. Use list comprehensions

This method uses list comprehension, a cleaner way to perform actions on each item of an existing list to create a new list.

numbers = [1, 2, 3, 4, 5]
squared_numbers = [num ** 2 for num in numbers]
print(squared_numbers)

3. Use map() function and lambda function

This method uses the map() function and the lambda function to calculate the square of each number in the list.

numbers = [1, 2, 3, 4, 5]
squared_numbers = list(map(lambda x: x ** 2, numbers))
print(squared_numbers)

4. Use map() function and defined functions

Similar to method 3, but it uses a separate defined function square(x), instead of the lambda function.

numbers = [1, 2, 3, 4, 5]
def square(x):
    return x ** 2
squared_numbers = list(map(square, numbers))
print(squared_numbers)

5. Use numpy library

This method uses the() function to calculate the square of each number in the list.

import numpy as np
numbers = [1, 2, 3, 4, 5]
squared_numbers = (numbers)
print(squared_numbers)

6. Use generator expressions

This method uses generator expressions, which is a high performance, memory-efficient generalization of list comprehensions and generators.

numbers = [1, 2, 3, 4, 5]
squared_numbers = (num ** 2 for num in numbers)
squared_numbers = list(squared_numbers)
print(squared_numbers)

7. Use the math library

This method uses the() function to calculate the square of each number in the list.

import math
numbers = [1, 2, 3, 4, 5]
squared_numbers = [(x, 2) for x in numbers]
print(squared_numbers)

8. Use the operator module

This method uses the() function to multiply each number in the list by itself.

import operator
numbers = [1, 2, 3, 4, 5]
squared_numbers = list(map(, numbers, numbers))
print(squared_numbers)

9. Use a loop with enumeration

This method uses the enumerate() function to get the index and value of each number in the list, and then use**The operator calculates the square of the number.

numbers = [1, 2, 3, 4, 5]
squared_numbers = []
for i, num in enumerate(numbers):
    squared_numbers.append(numbers[i] ** 2)
print(squared_numbers)

Attachment: Python calculates the squared instance code of all elements in the list

Method one map()

#-*- coding：utf-8 -*-

def pow2(arg):
    return arg**2

def pow2List(listarg):
    mapObj = map(pow2, listarg)
    result = list(mapObj)
    return result

print(pow2List([1,-1,0,3,5]))

Run the python file and get the output:

[1, 1, 0, 9, 25]

Method 2 derivation

>>> list1 = [-1,0,5,6,15]
>>> [x**2 for x in list1]

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