Defination:
A variable is the name given to a memory location. A value-holding Python variable is also known as an identifier.
Creating Variables:
Example:
1 2 | x = “vivek”print(x) |
Example:
1 2 | y = 5print(y) |
Variable Naming Rules:
- Variable names can contain letters (a-z, A-Z), digits (0-9), and underscore (_).
- Variable names cannot start with a digit.
- Python keywords cannot be used as variable names.
Variable names are case-sensitive (age, Age, and AGE are different variables).).
- PYTHON DATA TYPES
In programming, data type is an important concept.
- Numeric Types
- Sequence Types
- Mapping Type
- Set Types
- Boolean Type
- Numeric Types
- int: Integer type, which represents whole numbers.
Example: X=5
- float: Floating-point type, which represents decimal numbers.
Example: X=20.5
2. Sequence Types
- str: String type, which represents sequences of characters (text).
- list: List type, which represents ordered collections of items.
- tuple: Tuple type, which represents ordered immutable collections of items.
Example.
1 2 | string_var = "Hello, Python!"print(type(string_var)) |
Example.
1 2 3 | my_list = [1, 2, 3, 4, 5]print(my_list) print(my_list[0]) |
3.Mapping Type
dict: Dictionary type, which represents key-value pairs where keys must
be unique.
Example:
1 2 | dict_var = {'a': 1, 'b': 2} print(type(dict_var)) |
4.Set Types
set: Set type, which represents unordered collections of unique items.
frozenset: Immutable set type, similar to set but immutable once created.
Example.
1 2 | set_var = {1, 2, 3}print(type(set_var)) |
Example.
1 2 | frozenset_var = frozenset({1, 2, 3})print(type(frozenset_var)) |
5. Boolean Type
bool: Boolean type, which represents truth values (True or False).
Example.
1 2 | bool_var = Trueprint(type(bool_var)) |
