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Python: Find the elements of a given list of strings that contain specific substring using lambda

Python Lambda: Exercise-39 with Solution

Write a Python program to find the elements of a given list of strings that contain specific substring using lambda.

Sample Solution:

Python Code :

def find_substring(str1, sub_str):
    result = list(filter(lambda x: sub_str in x, str1))
    return result
colors = ["red", "black", "white", "green", "orange"]
print("Original list:")
print(colors)

sub_str = "ack"
print("\nSubstring to search:")
print(sub_str)
print("Elements of the said list that contain specific substring:")
print(find_substring(colors, sub_str))
sub_str = "abc"
print("\nSubstring to search:")
print(sub_str)
print("Elements of the said list that contain specific substring:")
print(find_substring(colors, sub_str))

Sample Output:

Original list:
['red', 'black', 'white', 'green', 'orange']

Substring to search:
ack
Elements of the said list that contain specific substring:
['black']

Substring to search:
abc
Elements of the said list that contain specific substring:
[]

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Previous: Write a Python program to remove all elements from a given list present in another list using lambda.
Next: Write a Python program to find the nested lists elements, which are present in another list 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