Python: Find the numbers that are greater than 10 and have odd first and last digits

Last update on May 28 2022 13:41:31 (UTC/GMT +8 hours)

Python Programming Puzzles: Exercise-55 with Solution

Write a Python program to find the numbers that are greater than 10 and have odd first and last digits.

Input:
[1, 3, 79, 10, 4, 1, 39, 62]
Output:
[79, 39]

Input:
[11, 31, 77, 93, 48, 1, 57]
Output:
[11, 31, 77, 93, 57]

Pictorial Presentation:

Python: Find the numbers that are greater than 10 and have odd first and last digits.

Sample Solution-1:

Python Code:

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

def test(nums):
      return [x for x in nums if x > 10 and x % 10 % 2 and int(str(x)[0]) % 2]
  
nums = [1, 3, 79, 10, 4, 1, 39]
print("Original list of numbers:")
print(nums)
print("Numbers of the said array that are greater than 10 and have odd first and last digits:")
print(test(nums))
nums = [11, 31, 77, 93, 48, 1, 57]
print("\nOriginal list of numbers:")
print(nums)
print("Numbers of the said array that are greater than 10 and have odd first and last digits:")
print(test(nums))

Sample Output:

Original list of numbers:
[1, 3, 79, 10, 4, 1, 39]
Numbers of the said array that are greater than 10 and have odd first and last digits:
[79, 39]

Original list of numbers:
[11, 31, 77, 93, 48, 1, 57]
Numbers of the said array that are greater than 10 and have odd first and last digits:
[11, 31, 77, 93, 57]

Flowchart:

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):
    return [n for n in nums if n > 10 and (int(str(n)[0]) * int(str(n)[-1])) % 2]  
nums = [1, 3, 79, 10, 4, 1, 39]
print("Original list of numbers:")
print(nums)
print("Numbers of the said array that are greater than 10 and have odd first and last digits:")
print(test(nums))
nums = [11, 31, 77, 93, 48, 1, 57]
print("\nOriginal list of numbers:")
print(nums)
print("Numbers of the said array that are greater than 10 and have odd first and last digits:")
print(test(nums))

Sample Output:

Original list of numbers:
[1, 3, 79, 10, 4, 1, 39]
Numbers of the said array that are greater than 10 and have odd first and last digits:
[79, 39]

Original list of numbers:
[11, 31, 77, 93, 48, 1, 57]
Numbers of the said array that are greater than 10 and have odd first and last digits:
[11, 31, 77, 93, 57]

Flowchart:

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 :

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Remove duplicates from a list of integers, preserving order.
Next: Find an integer exponent x such that a^x = n.

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