Change language

# Python | Wise amount in a nested list column

|

Examples :

`  Input:  [[1, 5, 3], [2, 7, 8], [4, 6, 9]]  Output:  [7, 18, 20]  Input:  [[20, 5], [2, 54], [45, 9], [72, 3]]  Output:  [139, 71] `

Method # 1: postal code, using list comprehension

We can find the sum of each column of a given nested list using the ` zip ` python function, enclosing it in a list.

 ` # Python3 program for nested list column wise sum `   ` def ` ` column_sum (lst): `   ` return ` ` [` ` sum ` ` (i) ` ` for ` ` i ` ` in ` ` zip ` ` (` ` * ` ` lst)] `   ` # Driver code ` ` lst ` ` = ` ` [[` ` 1 ` `, ` ` 5 ` `, ` ` 3 ` `], [` ` 2 ` `, ` ` 7 ` `, ` ` 8 ` `], [` ` 4 ` `, ` ` 6 ` `, ` ` 9 ` `]] ` ` print ` ` (column_sum (lst)) `

Output:

` [7, 18, 20] `

Method # 2: Using the map () method

Another way — use map () . We apply the sum function to each element in a column and find the sum of each column accordingly.

 ` # Python3 program for the column wise sum of the nested list `   ` def ` ` column_sum (lst): ` ` `  ` ` ` return ` ` list ` ` (` ` map ` ` (` ` sum ` `, ` ` zip ` ` (` ` * ` ` lst))) `   ` # Driver code ` ` lst ` ` = ` ` [[[` ` 1 ` `, ` ` 5 ` `, ` ` 3 ` `], [` ` 2 ` `, ` ` 7 ` `, ` ` 8 ` `], [` ` 4 ` `, ` ` 6 ` `, ` ` 9 ` `]] ` ` print ` ` (column_sum (lst)) `

Output:

` [7, 18, 20] `

Method # 3: Using numpy.sum ()

The numpy.sum () function returns the sum of the array elements along the specified axis.

 ` # Python3 program for the wise sum column of a nested list ` ` from ` ` numpy ` ` import ` ` array `   ` def ` ` column_sum (lst): ` ` arr ` ` = ` ` array (lst) ` ` return ` ` sum ` ` (arr, ` ` 0 ` `). tolist () `   ` # Driver code ` ` lst ` ` = ` ` [[` ` 1 ` `, ` ` 5 ` `, ` ` 3 ` `], [` ` 2 ` `, ` ` 7 ` `, ` ` 8 ` `], [` ` 4 ` `, ` ` 6 ` `, ` ` 9 ` `]] ` ` print ` ` (column_sum (lst)) `

Output:

` [7, 18, 20] `

## Shop

Learn programming in R: courses

\$

Best Python online courses for 2022

\$

Best laptop for Fortnite

\$

Best laptop for Excel

\$

Best laptop for Solidworks

\$

Best laptop for Roblox

\$

Best computer for crypto mining

\$

Best laptop for Sims 4

\$

Latest questions

NUMPYNUMPY

Common xlabel/ylabel for matplotlib subplots

NUMPYNUMPY

How to specify multiple return types using type-hints

NUMPYNUMPY

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

NUMPYNUMPY

Flake8: Ignore specific warning for entire file

NUMPYNUMPY

glob exclude pattern

NUMPYNUMPY

How to avoid HTTP error 429 (Too Many Requests) python

NUMPYNUMPY

Python CSV error: line contains NULL byte

NUMPYNUMPY

csv.Error: iterator should return strings, not bytes

## Wiki

Python | How to copy data from one Excel sheet to another

Common xlabel/ylabel for matplotlib subplots

Check if one list is a subset of another in Python

How to specify multiple return types using type-hints

Printing words vertically in Python

Python Extract words from a given string

Cyclic redundancy check in Python

Finding mean, median, mode in Python without libraries