Python – Random Numbers Summation

Sometimes, in making programs for gaming or gambling, we come across the task of creating the list all with random numbers and perform its summation. This task has to performed in general using loop and appending the random numbers one by one and then performing sum. But there is always requirement to perform this in most concise manner. Lets discuss certain ways in which this can be done.

Method #1 : Using list comprehension + randrange() + sum()
The naive method to perform this particular task can be shortened using the list comprehension. randrange function is used to perform the task of generating the random numbers. The task of performing sum is done using sum().

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# Python3 code to demonstrate 
# Random Numbers Summation
# using list comprehension + randrange() + sum()
import random
  
# using list comprehension + randrange() + sum()
# Random Numbers Summation
res = sum([random.randrange(1, 50, 1) for i in range(7)])
  
# printing result
print ("Random number summation list is : " + str(res))

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Output :

Random number summation list is : 187

 

Method #2 : Using random.sample() + sum()
This single utility function performs the exact required as asked by the problem statement, it generated N no. of random numbers in a list in the specified range and returns the required list. The task of performing sum is done using sum().

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# Python3 code to demonstrate 
# Random Numbers Summation
# using random.sample() + sum()
import random
  
# using random.sample() + sum()
# Random Numbers Summation
res = sum(random.sample(range(1, 50), 7))
  
# printing result
print ("Random number summation list is : " + str(res))

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Output :

Random number summation list is : 187
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