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Python: Check if the elements of the first list are contained in the second one regardless of order

Python List: Exercise - 270 with Solution

Write a Python program to check if the elements of the first list are contained in the second one regardless of order.

  • Use count() to check if any value in a has more occurrences than it has in b.
  • Return False if any such value is found, True otherwise.

Sample Solution:

Python Code:

def is_contained_in(l1, l2):
  for x in set(l1):
    if l1.count(x) > l2.count(x):
      return False
  return True
print(is_contained_in([1, 2], [2, 4, 1]))
print(is_contained_in([1], [2, 4, 1]))
print(is_contained_in([1, 1], [4, 2, 1]))
print(is_contained_in([1, 1], [3, 2, 4, 1, 5, 1]))

Sample Output: 

True
True
False
True

Flowchart:

Flowchart: Check if the elements of the first list are contained in the second one regardless of order.

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Previous: Write a Python program to get the every nth element in a given list.
Next: Write a Python program to check if there are duplicate values in a given flat list.

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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