Python Dict & Tuples

• Dictionary (dict)
  • A dictionary stores data as key-value pairs. Each key must be unique, and you use the key to access its corresponding value.
     
• Tuple (tuple)
  • A tuple is an ordered collection of items that cannot be changed after it is created (immutable).

Difference Between Dictionary (dict) and Tuple (tuple)

• Dictionary Example

student = {
   "name": "Alice",
   "age": 22,
   "city": "Delhi"
}
print(student["name"])

Output

Alice

• Tuple Example

student = ("Alice", 22, "Delhi")
print(student[0])

Output

Alice

• Dictionary Can Be Modified

student = {
   "name": "Alice",
   "age": 22
}
student["age"] = 23
student["city"] = "Delhi"
print(student)

Output

{'name': 'Alice', 'age': 23, 'city': 'Delhi'}

• Tuple Cannot Be Modified

student = ("Alice", 22)
student[1] = 23   # ❌ Error

Output

TypeError: 'tuple' object does not support item assignment

• Dictionary (dict) Methods

• Example

student = {
   "name": "Alice",
   "age": 20
}

# get()
print(student.get("name"))

# keys()
print(student.keys())

# values()
print(student.values())

# items()
print(student.items())

# update()
student.update({"city": "Delhi"})

# pop()
student.pop("age")

print(student)

• Tuple (tuple) Methods

numbers = (10, 20, 30, 20, 40)

# count()
print(numbers.count(20))

# index()
print(numbers.index(30))

Output

2
2

Quick Comparison

# Dictionary
person = {
   "name": "John",
   "age": 25
}
print(person["name"])   # Access by key

# Tuple
person = ("John", 25)
print(person[0])        # Access by index

Easy way to remember:

• 🗂️ Dictionary = Like a contact list (Name → Phone Number).
• 📦 Tuple = Like a sealed box—once packed, you can't change its contents.