Python: Check if a specific Key and a value exist in a dictionary

Last update on December 21 2024 07:28:38 (UTC/GMT +8 hours)

Write a Python program to check if a specific key and a value exist in a dictionary.

Visual Presentation:

Sample Solution:

Python Code:

# Define a function 'test' that takes a list of dictionaries 'dictt', a 'key', and a 'value' as arguments.
def test(dictt, key, value):
    # Check if any sub-dictionary in the list 'dictt' has the given 'key' with the specified 'value'.
    if any(sub[key] == value for sub in dictt):
        return True  # If found, return True.
    return False  # If not found, return False.

# Create a list of dictionaries 'students' with student details.
students = [
    {'student_id': 1, 'name': 'Jean Castro', 'class': 'V'},
    {'student_id': 2, 'name': 'Lula Powell', 'class': 'V'},
    {'student_id': 3, 'name': 'Brian Howell', 'class': 'VI'},
    {'student_id': 4, 'name': 'Lynne Foster', 'class': 'VI'},
    {'student_id': 5, 'name': 'Zachary Simon', 'class': 'VII'}
]

# Print a message indicating the start of the code section and display the original dictionary.
print("\nOriginal dictionary:")
print(students)

# Print a message indicating the purpose and demonstrate the 'test' function's usage
# to check if specific keys and values exist in the dictionary.
print("\nCheck if a specific Key and a value exist in the said dictionary:")
print(test(students, 'student_id', 1))
print(test(students, 'name', 'Brian Howell'))
print(test(students, 'class', 'VII'))
print(test(students, 'class', 'I'))
print(test(students, 'name', 'Brian Howelll'))
print(test(students, 'student_id', 11)) 

Sample Output:

Original dictionary:
[{'student_id': 1, 'name': 'Jean Castro', 'class': 'V'}, {'student_id': 2, 'name': 'Lula Powell', 'class': 'V'}, {'student_id': 3, 'name': 'Brian Howell', 'class': 'VI'}, {'student_id': 4, 'name': 'Lynne Foster', 'class': 'VI'}, {'student_id': 5, 'name': 'Zachary Simon', 'class': 'VII'}]

Check if a specific Key and a value exist in the said dictionary:
True
True
True
False
False
False

Flowchart:

Python Code Editor:

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