Python: Filter for the numbers in a list whose sum of digits is >0, where the first digit can be negative
Python Programming Puzzles: Exercise-47 with Solution
Write a Python program to Filter for the numbers in numbers in a given list whose sum of digits is > 0, where the first digit can be negative.
Input: [11, -6, -103, -200] Output: [11, -103] Input: [1, 7, -4, 4, -9, 2] Output: [1, 7, 4, 2] Input: [10, -11, -71, -13, 14, -32] Output: [10, -13, 14]
Sample Solution:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums):
return [n for n in nums if int(str(n)[:2]) + sum(map(int, str(n)[2:])) > 0]
nums = [11, -6, -103, -200]
print("Original list:")
print(nums)
print("Find the numbers in the said list whose sum of digits is >0, where the first digit can be negative:")
print(test(nums))
nums = [1, 7, -4, 4, -9, 2]
print("\nOriginal list:")
print(nums)
print("Find the numbers in the said list whose sum of digits is >0, where the first digit can be negative:")
print(test(nums))
nums = [10, -11, -71, -13, 14, -32]
print("\nOriginal list:")
print(nums)
print("Find the numbers in the said list whose sum of digits is >0, where the first digit can be negative:")
print(test(nums))
Sample Output:
Original list: [11, -6, -103, -200] Find the numbers in the said list whose sum of digits is >0, where the first digit can be negative: [11, -103] Original list: [1, 7, -4, 4, -9, 2] Find the numbers in the said list whose sum of digits is >0, where the first digit can be negative: [1, 7, 4, 2] Original list: [10, -11, -71, -13, 14, -32] Find the numbers in the said list whose sum of digits is >0, where the first digit can be negative: [10, -13, 14]
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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
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