Python Data Types

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Questions and Answers

Which of the following is an immutable sequence type in Python?

  • tuple (correct)
  • list
  • str
  • dict

What is the data type of the number 3+4j in Python?

  • int
  • complex (correct)
  • float
  • bool

Which of the following is a mutable mapping type in Python?

  • dict (correct)
  • set
  • list
  • tuple

What is the data type of the string 'hello' in Python?

<p>str (C)</p> Signup and view all the answers

Which of the following is a binary type in Python?

<p>bytes (C)</p> Signup and view all the answers

What is the data type of the set {1, 2, 3} in Python?

<p>set (A)</p> Signup and view all the answers

What is the data type of the boolean value True in Python?

<p>bool (A)</p> Signup and view all the answers

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Study Notes

Data Types in Python

Numeric Types

  • int: whole numbers, e.g. 1, 2, 3, etc.
  • float: decimal numbers, e.g. 3.14, -0.5, etc.
  • complex: complex numbers, e.g. 3+4j, 2-5j, etc.

Sequence Types

  • str: strings, e.g. "hello", 'hello', etc. (immutable)
    • Can be indexed and sliced like lists
    • Supports string methods like upper(), lower(), etc.
  • list: ordered collection of items, e.g. [1, 2, 3], ["a", "b", "c"], etc. (mutable)
    • Can be indexed and sliced
    • Supports list methods like append(), extend(), etc.
  • tuple: ordered, immutable collection of items, e.g. (1, 2, 3), ("a", "b", "c"), etc.

Mapping Type

  • dict: unordered collection of key-value pairs, e.g. {"name": "John", "age": 30}, etc. (mutable)
    • Can be indexed by key
    • Supports dictionary methods like keys(), values(), etc.

Set Types

  • set: unordered collection of unique items, e.g. {1, 2, 3}, {"a", "b", "c"}, etc. (mutable)
    • Supports set methods like union(), intersection(), etc.
  • frozenset: unordered, immutable collection of unique items, e.g. frozenset({1, 2, 3}), etc.

Boolean Type

  • bool: true or false values

Binary Types

  • bytes: sequence of integers in the range 0 <= x < 256, e.g. b"hello", etc.
  • bytearray: mutable sequence of integers in the range 0 <= x < 256, e.g. bytearray(b"hello"), etc.

None Type

  • NoneType: represents the absence of a value, e.g. None

Data Types in Python

Numeric Types

  • There are three numeric types: int, float, and complex.
  • int represents whole numbers, such as 1, 2, and 3.
  • float represents decimal numbers, such as 3.14 and -0.5.
  • complex represents complex numbers, such as 3+4j and 2-5j.

Sequence Types

  • There are three sequence types: str, list, and tuple.
  • str represents strings, such as "hello" and 'hello', which are immutable.
  • str can be indexed and sliced like lists and supports string methods like upper() and lower().
  • list represents ordered collections of items, such as [1, 2, 3] and ["a", "b", "c"], which are mutable.
  • list can be indexed and sliced and supports list methods like append() and extend().
  • tuple represents ordered, immutable collections of items, such as (1, 2, 3) and ("a", "b", "c").

Mapping Type

  • dict represents unordered collections of key-value pairs, such as {"name": "John", "age": 30}, which are mutable.
  • dict can be indexed by key and supports dictionary methods like keys() and values().

Set Types

  • There are two set types: set and frozenset.
  • set represents unordered collections of unique items, such as {1, 2, 3} and {"a", "b", "c"}, which are mutable.
  • set supports set methods like union() and intersection().
  • frozenset represents unordered, immutable collections of unique items, such as frozenset({1, 2, 3}).

Boolean Type

  • bool represents true or false values.

Binary Types

  • bytes represents sequences of integers in the range 0 <= x < 256.

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