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CBSE Class 12 Computer Science Question 44 of 57

Review of Python Basics — Question 44

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44
Question

Question 39

Write a Python script to check if a given key already exists in a dictionary.

Solution
my_dict = eval(input("Enter the dictionary: "))
key_check = input("Enter the key to be checked: ")
if key_check in my_dict:
    print("The key", key_check, "exists in the dictionary.")
else:
    print("The key", key_check, "does not exist in the dictionary.")
Output
Enter the dictionary: {'A': 1, 'B': 2, 'C': 3, 'D' : 4} 
Enter the key to be checked: C
The key C exists in the dictionary.

Enter the dictionary: {'A': 1, 'B': 2, 'C': 3, 'D' : 4}
Enter the key to be checked: E
The key E does not exist in the dictionary.
Answer

my_dict
=
eval
(
input
(
"Enter the dictionary: "
))
key_check
=
input
(
"Enter the key to be checked: "
)
if
key_check
in
my_dict
:
print
(
"The key"
,
key_check
,
"exists in the dictionary."
)
else
:
print
(
"The key"
,
key_check
,
"does not exist in the dictionary."
)
Output
Enter the dictionary: {'A': 1, 'B': 2, 'C': 3, 'D' : 4}
Enter the key to be checked: C
The key C exists in the dictionary.

Enter the dictionary: {'A': 1, 'B': 2, 'C': 3, 'D' : 4}
Enter the key to be checked: E
The key E does not exist in the dictionary.