Python List Comprehension & any,all

PYTHON

Python is a vast languages there is always somthing that you left behind if you are a beginner Let's Explore Some of that

1. List Compression

List compression is used as one liners in python they are sometimes very useful While we doesn't want to write a loop to fill list

For example : if we want to create a list of square of odd numbers from pre-existing list of numbers 1 to 10 

We consider doing this in two ways :

• For loop

l1=[1,2,3,4,5,6,7,8,9,10] 

result=[] 

for item in l1: 
    if item%2 != 0: 
        result.append(item**2) 

print(result)  

• List Compression

l=[x**2 for x in range(10) if x%2!=0] 

print(l) 

Result For Both :

[1,9,25,49,81] 

Let's see how it works

l=[result  loop  condition]

• The first one is result that you want 

• The second one is loop it's on you how you use it

• The third one is if else condition that you want to follow (optional)

Note : This also works with dictionaries ,tuples

Let's move on to second one

2. any , all keywords

any ,all keyword return a boolean they are generally used when we need to check multiple condition

For example : if we have a list of string and we need to check whether all the words are present in given string

We generally use two ways :

• Check condition one by one

con=["hey","are","you"] 

phrase="hey what are you doing!" 

if con[0] in phrase and con[1] in phrase and con[2] in phrase: 
  print(("All Words Match")) 

• Using "all"

con=["hey","are","you"] 

phrase="hey what are you doing!" 

if all(x in phrase for x in con): 
    print("All Words Match") 

Result for Both:

All Words Match 

We can also use "any" in similar way if we want to check if any of words of list con present in phrase