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Python: Compute the sum of elements of a given array of integers

Python map: Exercise-11 with Solution

Write a Python program to compute the sum of elements of an array of integers. Use the map() function.

Sample Solution:

Python Code :

from array import array
def array_sum(nums_arr):
    sum_n = 0
    for n in nums_arr:
        sum_n += n
    return sum_n

nums = array('i', [1, 2, 3, 4, 5, -15])
print("Original array:",nums)
nums_arr = list(map(int, nums))
result = array_sum(nums_arr)
print("Sum of all elements of the said array:")
print(result)

Sample Output:

Original array: array('i', [1, 2, 3, 4, 5, -15])
Sum of all elements of the said array:
0

Python Code Editor:

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Previous: Write a Python program to compute the square of first N Fibonacci numbers, using map function and generate a list of the numbers.
Next: Write a Python program to find the ration of positive numbers, negative numbers and zeroes in an array of integers.

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Python: Tips of the Day

Kwargs:

**kwargs and *args are function arguments that can be very useful.

They are quite underused and often under-understood as well.

Let's try to explain what kwargs are and how to use them.

  • While *args are used to pass arguments at an unknown amount to functions, **kwargs are used to do the same but with named arguments.
  • So, if *args is a list being passed as an argument, you can think of **kwargs as a dictionary that's being passed as an argument to a function.
  • You can use arguments as you wish as long as you follow the correct order which is: arg1, arg2, *args, **kwargs. It's okay to use only one of those but you can't mix the order, for instance, you can't have: function(**kwargs, arg1), that'd be a major faux pas in Python.
  • Another example: You can do function(*args,**kwargs) since it follows the correct order.
  • Here is an example. Let's say satelites are given with their names and weight in tons in dictionary format. Code prints their weight as kilograms along with their names.
def payloads(**kwargs):
    for key, value in kwargs.items():
        print( key+" |||", float(value)*100)
payloads(NavSat1 = '2.5', BaysatG2 = '4')

Output:

NavSat1 ||| 250.0
BaysatG2 ||| 400.0

Since the function above would work for any number of dictionary keys, **kwargs makes perfect sense rather than passing arguments with a fixed amount.

def payloads(**kwargs):
    for key, value in kwargs.items():
        print( key+" |||", float(value)*100)

sats={"Tx211":"3", "V1":"0.50"}
payloads(**sats)

Output:

Tx211 ||| 300.0
V1 ||| 50.0