## Identifying common element in list in python

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common elements in three lists python

I have two lists. I need to compare elements whether any element in the list is matching or not. Input:

a = ['1001,1715'] b = ['1009,1715']

Output : `1715`

Please suggest how to do it? I tried doing:

set(''.join(a))

and

set(''.join(b))

but it gave me `{'5', '0', '7', ',', '1'}`

. how can I convert `['1001,1715']`

to `[1001,1715]`

?

There are 2 parts to your problem.

**Convert strings to sets of integers**

Since your string is the only element of a list, you can use list indexing and `str.split`

with `map`

:

a_set = set(map(int, a[0].split(','))) b_set = set(map(int, b[0].split(',')))

**Calculate the intersection of 2 sets**

res = a_set & b_set # alternatively, a_set.intersection(b_set) print(res) {1715}

**Python,** Given two lists, print all the common element of two lists. Examples: Input : list1 = [1, 2, 3, 4, 5] list2 = [5, 6, 7, 8, 9] Output : {5} Explanation: The common elements The problem of finding the common elements in list of 2 lists is quite a common problem and can be dealt with ease and also has been discussed before many times. But sometimes, we require to find the elements that are in common from N lists.

a = ['1001,1715'] b = ['1009,1715'] def fun(a): return a[0].split(",") def intersect(a, b): return list(set(a) & set(b)) print(intersect(fun(a),fun(b)))

**Identifying common element in list in python,** There are 2 parts to your problem. Convert strings to sets of integers. Since your string is the only element of a list, you can use list indexing and To find the common list from two lists, we have to store the common elements in the third variable. There are various methods to find and store the common elements from two lists. How to find the common elements in two lists in Python

You can use set intersection:

set(a[0].split(',')).intersection(set(b[0].split(',')))

Which returns:

{'1715'}

Converting from `'1001,1715'`

to `['1001', '1715']`

can simply be done with `.split(',')`

**Python: Find common items from two lists,** Python List: Exercise - 37 with Solution. Write a Python program to find common items from two lists. Previous: Write a Python program to get variable unique identification number Checks if all elements in a list are equal. A list is one of the most useful data structure in Python. It contains multiple elements, and some elements can be repeated. Sometimes it needs to find all the unique elements from list in Python. This can be accomplished by simple python set operation. Python syntax for set operation. set(<python_list>) Inferring it with an example will be easy.

A more general solution if you have lists with more elements (e.g `a = ['1001,1715','1009,2000']`

)

a = [x for xs in a for x in xs.split(',')] b = [x for xs in b for x in xs.split(',')] common = set(a).intersection(set(b))

Example:

a = ['1001,1715','1009,2000'] b = ['1009,1715']

Output:

{'1009', '1715'}

**common elements of a list,** given 2 or more lists, i'd like to get a list of the common elements. if the order gets re-arranged that is ok. Python Code: (Double-click to select all) I'm trying to write a piece of code that can automatically factor an expression. For example, if I have two lists [1,2,3,4] and [2,3,5], the code should be able to find the common elements in the

**Find the common elements in two lists in Python,** This tutorial will guide you to learn how to find the common elements in two lists in Python. We will use our own function as well as some built-in methods. Convert the lists to sets and then print set1&set2. set1&set2 returns the common elements set, where set1 is the list1 and set2 is the list2. Below is the Python3 implementation of the above approach: # Python program to find the common elements. # in two lists.

**How to find the most common element in a list? : learnpython,** Hi I'm new to python and programming. I have a list of numbers and for an assignment I need to print out the most common element in the list and how many Approach #2 : Pythonic Naive appraoch Make a set of the list so that the duplicate elements are deleted. Then find the highest count of occurrences of each element in the set and thus, we find the maximum out of it.

**Items in Common from 2 Lists Finder - Compare - Online Tool,** Tool to find common items in two lists. The operation of intersection of two lists consists in finding a set of all elements present in both list 1 and list 2. Python - Lists The most basic data structure in Python is the sequence. Each element of a sequence is assigned a number - its position or index. The first index is zero, the second index is one, and so forth.