Change language

# Python | Find the sum of the frequency of given items in a list

| |

Example :

`  Input:  list1 = [1, 2, 3] list2 = [2, 1, 2, 1, 3, 5, 2, 3]  Output:  7  Explanation:  No of time 1 occurring in list2 is: 2 No of time 2 occurring in list2 is: 3 No of time 3 occurring in list2 is: 2 Sum = 2 + 3 + 2 = 7 `

Below are some ways to solve the above problems.

Method # 1: Using ` sum () `

 ` # Python code for finding the sum of frequencies ` ` # element of the first list in the second list. `   ` # Initialization list ` ` Input1 ` ` = ` ` [` ` 1 ` `, ` ` 2 ` `, ` ` 3 ` `] ` ` Input2 ` ` = ` ` [` ` 2 ` `, ` ` 1 ` `, ` ` 2 ` `, ` ` 1 ` `, ` ` 3 ` `, ` ` 5 ` `, ` ` 2 ` `, ` ` 3 ` `] ` ` `  ` # Using sum ` ` Output ` ` = ` ` sum ` ` (Input2.count (elem) ` ` for ` ` elem ` ` in ` ` Input1) `   ` # Printout ` ` print ` ` (` ` "Initial list are:" ` `, Input1, Input2) ` ` print ` ` (` ` "Frequency is:" ` `, Output) `

Exit:

` Initial list are: [1, 2, 3] [2, 1, 2, 1, 3, 5, 2, 3] Frequency is: 7 `

Method # 2: Using ` sum () ` and `Counter()`

 ` from ` ` collections ` ` import ` ` Counter `   ` # Init list andization ` ` Input1 ` ` = ` ` [` ` 1 ` `, ` ` 2 ` `, ` ` 3 ` `] ` ` Input2 ` ` = ` ` [` ` 2 ` `, ` ` 1 ` `, ` ` 2 ` `, ` ` 1 ` `, ` ` 3 ` ` , ` ` 5 ` `, ` ` 2 ` `, ` ` 3 ` `] ` ` `    ` temp ` ` = < / code> Counter (Input2) `` Output = sum (temp [x] for x in Input1)    # Printout print ( " Initial list are: " , Input1, Input2) print ( "Frequency is:" , Output) `

Exit:

` Initial list are: [1, 2, 3] [2, 1, 2, 1, 3, 5, 2, 3] Frequency is: 7 `

## 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