Python: Filter a list of integers using Lambda
Python Lambda: Exercise-5 with Solution
Write a Python program to filter a list of integers using Lambda.
Sample Solution:
Python Code :
nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
print("Original list of integers:")
print(nums)
print("\nEven numbers from the said list:")
even_nums = list(filter(lambda x: x%2 == 0, nums))
print(even_nums)
print("\nOdd numbers from the said list:")
odd_nums = list(filter(lambda x: x%2 != 0, nums))
print(odd_nums)
Sample Output:
Original list of integers: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] Even numbers from the said list: [2, 4, 6, 8, 10] Odd numbers from the said list: [1, 3, 5, 7, 9]
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Test for a single number:
Python Code :
print((lambda x: (x % 2 and 'Odd number' or 'Even number'))(5))
print((lambda x: (x % 2 and 'Odd number' or 'Even number'))(8))
Sample Output:
Odd number Even number
Python Code Editor:
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Previous: Write a Python program to sort a list of dictionaries using Lambda.
Next: Write a Python program to square and cube every number in a given list of integers using Lambda.
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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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