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Python: First even and odd number in a given list of numbers

Python List: Exercise - 137 with Solution

Write a Python program to find a first even and odd number in a given list of numbers.

Sample Solution:

Python Code:

def first_even_odd(nums):
    first_even = next((el for el in nums if el%2==0),-1)
    first_odd = next((el for el in nums if el%2!=0),-1)
    return first_even,first_odd

nums= [1,3,5,7,4,1,6,8]
print("Original list:")
print(nums)
print("\nFirst even and odd number of the said list of numbers:")
print(first_even_odd(nums))

Sample Output: 

Original list:
[1, 3, 5, 7, 4, 1, 6, 8]

First even and odd number of the said list of numbers:
(4, 1)

Flowchart:

Flowchart: First even and odd number in a given list of numbers.

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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