Python - Elements Product till K value

One of the problem that is basically a subproblem for many complex problems, finding product number till a certain number in list in python, is commonly encountered and this particular article discusses possible solutions to this particular problem.

Method #1 : Naive method
The most common way this problem can be solved is using a loop and just multiplying the occurrences of elements that are till given number K.

# Python 3 code to demonstrate  
# Elements Product till K value 
# using naive method  
  
# initializing list  
test_list = [1, 7, 5, 6, 3, 8]  
  
# initializing k  
k = 6
  
# printing list  
print ("The list : " + str(test_list))  
  
# using naive method  
# Elements Product till K value 
res = 1
for i in test_list :  
    if i <= k :  
        res *= i  
  
# printing the product 
print ("The product till K : " + str(res))  

Output :

The list : [1, 7, 5, 6, 3, 8]
The product till K : 90

Method #2 : Using list comprehension
This method achieves this task in a similar way, but in a more concise manner. List comprehension always lowers the lines of codes in the program even though runs a similar approach in the background.

# Python 3 code to demonstrate  
# Elements Product till K value 
# using list comprehension 
  
# getting Product  
def prod(val) :  
    res = 1 
    for ele in val:  
        res *= ele  
    return res   
  
# initializing list  
test_list = [1, 7, 5, 6, 3, 8]  
  
# initializing k  
k = 6
  
# printing list  
print ("The list : " + str(test_list))  
  
# using list comprehension  
# Elements Product till K value 
res = prod([i for i in test_list if i <= k])  
  
# printing the intersection  
print ("The product till K : " + str(res))  

Output :

The list : [1, 7, 5, 6, 3, 8]
The product till K : 90

My Personal Notes

Python – Elements Product till K value

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