Variable Naming Conventions

Data Types

Python has several built-in data types. Here’s a breakdown:

• Numeric Types:

  • int: Integers (e.g., 10, -5, 0)
  • float: Floating-point numbers (e.g., 3.14, -2.5, 0.0)
  • complex: Complex numbers (e.g., 2+3j)

• Text Type:

  • str: Strings (e.g., “hello”, ‘Python’, “““multiline string”””)

• Sequence Types:

  • list: Ordered, mutable sequence of items (e.g., 1, 2, "apple", 3.14)
  • tuple: Ordered, immutable sequence of items (e.g., (1, 2, "apple", 3.14))
  • range: Represents a sequence of numbers (e.g., range(10))

• Mapping Type:

  • dict: Unordered collection of key-value pairs (e.g., {"name": "Alice", "age": 30})

• Set Types:

  • set: Unordered collection of unique items (e.g., {1, 2, 3})
  • frozenset: Immutable set (e.g., frozenset({1, 2, 3}))

• Boolean Type:

  • bool: Represents truth values (True or False)

• Binary Types:

  • bytes: Immutable sequence of bytes
  • bytearray: Mutable sequence of bytes
  • memoryview: Allows access to the internal data of an object without copying

Example Code:

my_int = 10
my_float = 3.14
my_string = "Hello, world!"
my_list = 1, 2, 3
my_tuple = (4, 5, 6)
my_dict = {"a": 1, "b": 2}
my_set = {1, 2, 3}
my_bool = True

Type Conversion:

Python allows type conversion (casting) between data types using functions like int(), float(), str(), etc. However, not all conversions are possible (e.g., converting a string containing letters to an integer will raise an error).

x = 10  # int
y = float(x)  # convert to float
z = str(x)   # convert to string

Type Conversion Mutability Immutability Sequence Types in Detail Dictionary Methods