Dictionaries in Python

Dictionary kya hai?

Python me dictionary ek aisa collection hai jisme data key-value pairs ke form me store hota hai. Matlab har value ka ek naam (key) hota hai.

Dictionary banane ka example:

# Example of a dictionary
student = {
    "name": "Amit",
    "age": 21,
    "course": "Python"
}
print(student)

Output:

{'name': 'Amit', 'age': 21, 'course': 'Python'}

Dictionary ke elements access karna

print(student["name"])   # Amit
print(student["age"])    # 21

Dictionary update karna

student["age"] = 22
print(student)

Output:

{'name': 'Amit', 'age': 22, 'course': 'Python'}

Naya key-value add karna

student["grade"] = "A"
print(student)

Output:

{'name': 'Amit', 'age': 22, 'course': 'Python', 'grade': 'A'}

Key ko remove karna

del student["course"]
print(student)

Output:

{'name': 'Amit', 'age': 22, 'grade': 'A'}

Useful Dictionary Methods

print(student.keys())    # dict_keys(['name', 'age', 'grade'])
print(student.values())  # dict_values(['Amit', 22, 'A'])
print(student.items())   # dict_items([('name', 'Amit'), ('age', 22), ('grade', 'A')])

Loop through Dictionary

for key, value in student.items():
    print(key, ":", value)

Output:

name : Amit
age : 22
grade : A

Next Step

Ab seekhte hain Iteration on Lists, Tuples & Dictionaries, jahan hum collections ko loop ke saath traverse karenge.