Check If Any Key Has All Given List Elements in Python

An array(list) of comma-separated values (items) enclosed in square brackets is one of the most flexible data types available in Python. The fact that a list's elements do not have to be of the same type is important.

In this article, we will learn a python program to check if any key has all the given list elements.

Example

Assume we have taken an input dictionary and a list. We will now check whether the values of any key of the input dictionary contain given list elements using the above methods.

Input

inputDict = {'hello': [4, 2, 8, 1],
			'tutorialspoint': [5, 12, 10, 6],
			'python': [9, 3, 7, 1],
			'users': [3, 6, 1, 8, 2]}
inputList = [1, 2, 3]

Output

Do the values of any key have given list elements?: True

In the above dictionary, only the 'users' key contains the values of all the input list elements 1, 2, 3. Hence the result is True.

Algorithm (Steps)

Following are the Algorithm/steps to be followed to perform the desired task

• Create a variable to store the input dictionary and print it.

• Create another variable to store the input list.

• Initialize the result as False.

• Use the for loop to traverse through the keys of the input dictionary.

• Use the if conditional statement to check whether the corresponding value of the current key is present in the input list using issuperset() function.

• Update the result as True if the condition is true.

• Print the result.

Example 1: Using for loop and issuperset() function

issuperset() function(returns True if all elements in the given set are present in the original set; else, returns False)

The following program checks whether the values of any key of the input dictionary contain given list elements using the for loop and issuperset() function -

# input dictionary
inputDict = {'hello': [4, 2, 8, 1],
             'tutorialspoint': [5, 12, 10, 6],
             'python': [9, 3, 7, 1],
             'users': [3, 6, 1, 8, 2]}
# printing input dictionary
print("Input dictionary:\n", inputDict)
# input list
inputList = [1, 2, 3]
# initializing result as False
result = False
# traversing through the keys of the input dictionary
for k in inputDict:
    # checking whether the corresponding value of the current key is
    # present in the input list using issuperset() function
    if set(inputDict[k]).issuperset(inputList):
        # updating the result as True if the condition is true
        result = True
# printing the result
print("Do the values of any key have given list elements?:", result)

Output

Input dictionary:
 {'hello': [4, 2, 8, 1], 'tutorialspoint': [5, 12, 10, 6], 'python': [9, 3, 7, 1], 'users': [3, 6, 1, 8, 2]}
Do the values of any key have given list elements?: True

Example 2: Using any() and issuperset() functions

any() function: returns True if any item in an iterable is true, else returns False.

The following program checks whether the values of any key of the input dictionary contain given list elements using the any() and issuperset() functions -

# input dictionary
inputDict = {'hello': [4, 2, 8, 1],
			'tutorialspoint': [5, 12, 10, 6],
			'python': [9, 3, 7, 1],
			'users': [3, 6, 1, 8, 2]}
# printing input dictionary
print("Input dictionary:\n", inputDict)
# input list
inputList = [1, 2, 3]
# Checking if the key has all list elements
result = any(set(val).issuperset(inputList)
		for val in inputDict.values())
# printing the result
print("Do the values of any key have given list elements?:", result)

Output

Input dictionary:
 {'hello': [4, 2, 8, 1], 'tutorialspoint': [5, 12, 10, 6], 'python': [9, 3, 7, 1], 'users': [3, 6, 1, 8, 2]}
Do the values of any key have given list elements?: True

Example 3: Without issuperset() function

The following program checks whether the values of any key of the input dictionary contain given list elements without using issuperset() function

# creating a function to check key contains all list elements
# by accepting dictionary value, input list as arguments 
def containsListElements(a,b):
	cnt =0
	for k in b:
		if k in a:
			cnt+=1
	if(cnt==len(b)):
		return True
	return False
# input dictionary
inputDict = {'hello': [4, 2, 8, 1],
			'tutorialspoint': [5, 12, 10, 6],
			'python': [9, 3, 7, 1],
			'users': [3, 6, 1, 8, 2]}

# input list
inputList = [1, 2, 3]
# initializing result as False
result = False
# traversing through the keys of input dictionary 
for k in inputDict.keys():
    # calling the above defined contains() function 
	if(containsListElements(inputDict[k],inputList)):
        # updating the result as True if the condition is true
		result=True
        # breaking the loop
		break
# printing the result
print("Do the values of any key have given list elements?:", result)

Output

Do the values of any key have given list elements?: True

Example 4: Using Recursion

The following program checks whether the values of any key of the input dictionary contain given list elements using recursion

def containsListElements(a, b, result):
    if len(b) == 0:
        return result
    if b[0] in a:
        return containsListElements(a, b[1:], True)
    else:
        return containsListElements(a, b[1:], False)

def recursiveFunc(inputDict, inputList, result):
     # returning the result directly if the length of the input dictionary is 0
    if len(inputDict) == 0:
        return result
    # removing the key value from the given dictionary
    key, val = inputDict.popitem()
    if containsListElements(val, inputList, False):
        # updating the result as True if the condition is true
        result = True
    # recursive logic
    return recursiveFunc(inputDict, inputList, result)

# input dictionary
inputDict = {'hello': [4, 2, 8, 1],
             'tutorialspoint': [5, 12, 10, 6],
             'python': [9, 3, 7, 1],
             'users': [3, 6, 1, 8, 2]}

# input list
inputList = [1, 2, 3]

result = recursiveFunc(inputDict, inputList, False)
# printing the result
print("Do the values of any key have given list elements?:", result)

Output

Do the values of any key have given list elements?: True

Conclusion

In this article, we have learned 4 different methods to check if any key has all the given list elements. Additionally, we learned how to use the pop() function to delete the key-value pairs from the dictionary.