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Python: Find the sum of the numbers among the first k with more than 2 digits

Python Programming Puzzles: Exercise-34 with Solution

Write a Python program to find the sum of the numbers of a given list among the first k with more than 2 digits.

Input:  
[4, 5, 17, 9, 14, 108, -9, 12, 76]
Value of K: 4
Output:
0

Input:  
[4, 5, 17, 9, 14, 108, -9, 12, 76]
Value of K: 6
Output:
108

Input:  
[114, 215, -117, 119, 14, 108, -9, 12, 76]
Value of K: 5
Output:
331

Input:  
[114, 215, -117, 119, 14, 108, -9, 12, 76]
Value of K: 1
Output:
114

Pictorial Presentation:

Python: Find the sum of the numbers among the first k with more than 2 digits.
Python: Find the sum of the numbers among the first k with more than 2 digits.

Sample Solution-1:

Python Code:

#License: https://bit.ly/3oLErEI

def test(nums, k):
    s = 0
    for i in range(len(nums))[:k]:
        if len(str(abs(nums[i])))>2:
            s = s + nums[i]
    return s

nums = [4, 5, 17, 9, 14, 108, -9, 12 ,76]
print("Original list:",nums)
K = 4
print("Value of K:",K)
print("sum of the numbers among the first k with more than 2 digits")
print(test(nums, K))
nums = [4, 5, 17, 9, 14, 108, -9, 12 ,76]
print("\nOriginal list:",nums)
K = 6
print("Value of K:",K)
print("sum of the numbers among the first k with more than 2 digits")
print(test(nums, K))
nums = [114, 215, -117, 119, 14, 108, -9, 12 ,76]
print("\nOriginal list:",nums)
K = 5
print("Value of K:",K)
print("sum of the numbers among the first k with more than 2 digits")
print(test(nums, K)) 
print("\nOriginal list:",nums)
K = 1
print("Value of K:",K)
print("sum of the numbers among the first k with more than 2 digits")
print(test(nums, K))

Sample Output:

Original list: [4, 5, 17, 9, 14, 108, -9, 12, 76]
Value of K: 4
sum of the numbers among the first k with more than 2 digits
0

Original list: [4, 5, 17, 9, 14, 108, -9, 12, 76]
Value of K: 6
sum of the numbers among the first k with more than 2 digits
108

Original list: [114, 215, -117, 119, 14, 108, -9, 12, 76]
Value of K: 5
sum of the numbers among the first k with more than 2 digits
331

Original list: [114, 215, -117, 119, 14, 108, -9, 12, 76]
Value of K: 1
sum of the numbers among the first k with more than 2 digits
114

Flowchart:

Flowchart: Python - Find the sum of the numbers among the first k with more than 2 digits.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-2:

Python Code:

#License: https://bit.ly/3oLErEI

def test(nums, k):
    return sum(n for n in nums[:k] if len(str(abs(n))) > 2)

nums = [4, 5, 17, 9, 14, 108, -9, 12 ,76]
print("Original list:",nums)
K = 4
print("Value of K:",K)
print("sum of the numbers among the first k with more than 2 digits")
print(test(nums, K))
nums = [4, 5, 17, 9, 14, 108, -9, 12 ,76]
print("\nOriginal list:",nums)
K = 6
print("Value of K:",K)
print("sum of the numbers among the first k with more than 2 digits")
print(test(nums, K))
nums = [114, 215, -117, 119, 14, 108, -9, 12 ,76]
print("\nOriginal list:",nums)
K = 5
print("Value of K:",K)
print("sum of the numbers among the first k with more than 2 digits")
print(test(nums, K)) 
print("\nOriginal list:",nums)
K = 1
print("Value of K:",K)
print("sum of the numbers among the first k with more than 2 digits")
print(test(nums, K))

Sample Output:

Original list: [4, 5, 17, 9, 14, 108, -9, 12, 76]
Value of K: 4
sum of the numbers among the first k with more than 2 digits
0

Original list: [4, 5, 17, 9, 14, 108, -9, 12, 76]
Value of K: 6
sum of the numbers among the first k with more than 2 digits
108

Original list: [114, 215, -117, 119, 14, 108, -9, 12, 76]
Value of K: 5
sum of the numbers among the first k with more than 2 digits
331

Original list: [114, 215, -117, 119, 14, 108, -9, 12, 76]
Value of K: 1
sum of the numbers among the first k with more than 2 digits
114

Flowchart:

Flowchart: Python - Find the sum of the numbers among the first k with more than 2 digits.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor :

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m