Python Challenges: Calculate sum of all positive, negative integers present in a given string

Last update on May 28 2022 13:42:25 (UTC/GMT +8 hours)

Python Challenges - 1: Exercise-64 with Solution

Write a Python program to calculate sum of all positive, negative integers present in a given string.

Sample Solution-1:

Python Code:

from re import findall
def positive_negative_sum(str1):
    return sum(map(int, findall(r'\d+', str1))), sum(map(int, findall(r'-\d+', str1)))
str1 = '-100#^[email protected]'
print("Original string:")
print(str1)
print("\nSum of all positive, negative integers present in the said string:")
result = positive_negative_sum(str1)
print("Positive values:",result[0])
print("Negative values:",result[1])

Sample Output:

Original string:
-100#^[email protected]

Sum of all positive, negative integers present in the said string:
Positive values: 9046
Negative values: -120

Flowchart:

Sample Solution-2:

Python Code:

import re
def positive_negative_sum(str1):
    positive_values = sum(int(n) for n in re.findall('\d+', str1))
    negative_values = sum(int(n) for n in re.findall('-\d+', str1))
    return positive_values, negative_values

str1 = '-100#^[email protected]'
print("Original string:")
print(str1)
print("\nSum of all positive, negative integers present in the said string:")
result = positive_negative_sum(str1)
print("Positive values:",result[0])
print("Negative values:",result[1])

Sample Output:

Original string:
-100#^[email protected]

Sum of all positive, negative integers present in the said string:
Positive values: 9046
Negative values: -120

Flowchart:

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