Skip to main content

Tuple

In Python, tuples are similar to lists but with a key difference - they are immutable. Once a tuple is created, it cannot be modified, making them more memory-efficient. The defining factor for a tuple is the comma (,), not the parentheses. While tuples are often seen wrapped in parentheses, it's the comma that denotes the tuple.

Creating Tuples​

Basic Tuple​

# Tuple without parentheses
items = 1, True, 'text'
print(type(items))  # Output: <class 'tuple'>

Single-Element Tuple​

# Single-element tuple
single_item_tuple = (42,)
print(type(single_item_tuple))  # Output: <class 'tuple'>

Empty Tuple​

# Empty tuple
empty_tuple = ()
print(type(empty_tuple))  # Output: <class 'tuple'>

Using Tuples​

Example: Coordinates​

# Tuple for coordinates
coordinates = 1.5, 2.5

# Attempting to modify the tuple will raise a TypeError
try:
    coordinates[0] = 10
except TypeError as e:
    print(f"Error: {e}")

# Output: Error: 'tuple' object does not support item assignment

Tuple Methods​

# Tuple methods (count and index)
print(coordinates.count(1.5))  # Output: 1
print(coordinates.index(2.5))  # Output: 1

Annotating Tuples​

When annotating tuples, specify the data types by position.

# Annotating tuple elements
annotated_coordinates: tuple[float, float] = 1.5, 2.5

Choosing Between Lists and Tuples​

Remember, if your data needs to change dynamically, use a list. If the data is constant, choose a tuple.

List vs. Tuple Summary:

  • Lists for dynamic data with add and remove operations.
  • Tuples for immutable, constant data.