Skip to main content

Python - Find common elements in two lists, avoid None values

Finding common values between two lists is easy in Python when compared to Javascript. First remove all None values. Because the in-built function will consider None also as a value to compare. If we don't want that then remove it using filter function. Then make one of the lists as set and use intersection function as follows:

Run the code here: https://repl.it/@VinitKhandelwal/CommonElementsList
list1 = ['a','b','c',None]
list2 = ['c','d','e',None]
list3 = list(filter(lambda x: x is not None, list1))
list4 = list(filter(lambda x: x is not None, list2))
print(list3)
print(list4)
print(list(set(list3).intersection(list4)))

list1 = [1,2,3,4,None,5,6]
list2 = [3, 5, 7, 9, None]
list3=[]
for i in list1:
for j in list2:
if i is not None and i == j:
list3.append(i)
break
print(f"{list3} - function to find common values")

OUTPUT
[3, 5] - function to find common values ['a', 'b', 'c'] ['c', 'd', 'e'] ['c']

Comments

Post a Comment

Popular posts from this blog

Python - List - Append, Count, Extend, Index, Insert, Pop, Remove, Reverse, Sort

🐍 Advance List List is widely used and it's functionalities are heavily useful. Append Adds one element at the end of the list. Syntax list1.append(value) Input l1 = [1, 2, 3] l1.append(4) l1 Output [1, 2, 3, 4] append can be used to add any datatype in a list. It can even add list inside list. Caution: Append does not return anything. It just appends the list. Count .count(value) counts the number of occurrences of an element in the list. Syntax list1.count(value) Input l1 = [1, 2, 3, 4, 3] l1.count(3) Output 2 It returns 0 if the value is not found in the list. Extend .count(value) counts the number of occurrences of an element in the list. Syntax list1.extend(list) Input l1 = [1, 2, 3] l1.extend([4, 5]) Output [1, 2, 3, 4, 5] If we use append, entire list will be added to the first list like one element. Extend, i nstead of considering a list as one element, it joins the two lists one after other. Append works in the following way. Input l1 = [1, 2, 3] l1.append([4, 5]) Output...
Post a Comment
Read more

Difference between .exec() and .execPopulate() in Mongoose?

Here I answer what is the difference between .exec() and .execPopulate() in Mongoose? .exec() is used with a query while .execPopulate() is used with a document Syntax for .exec() is as follows: Model.query() . populate ( 'field' ) . exec () // returns promise . then ( function ( document ) { console . log ( document ); }); Syntax for .execPopulate() is as follows: fetchedDocument . populate ( 'field' ) . execPopulate () // returns promise . then ( function ( document ) { console . log ( document ); }); When working with individual document use .execPopulate(), for model query use .exec(). Both returns a promise. One can do without .exec() or .execPopulate() but then has to pass a callback in populate.
1 comment
Read more

Resolve: Uncaught TypeError: firebase.database is not a function

If you are getting the error: Uncaught TypeError: firebase.database is not a function Resolve it by including firebase-database.js in your html page as follows: <!-- The core Firebase JS SDK is always required and must be listed first --> <script defer src = "https://www.gstatic.com/firebasejs/6.2.4/firebase-app.js" ></script> <script defer src = "https://www.gstatic.com/firebasejs/3.1.0/firebase-database.js" ></script> That is it. Let me know if this was helpful.
Post a Comment
Read more