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Documentation Index

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Introduction to Variables

Variables in Python are containers for storing data values. Unlike some other programming languages, Python doesn’t require explicit declaration of variable types - the type is automatically determined based on the value assigned.

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Variable Types

Python supports several fundamental data types:

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Integer (INT)

Stores whole numbers without decimal points. 
variable_de_tipo_entero = 10
print(f"Variable de tipo entero: {variable_de_tipo_entero}")
print(type(variable_de_tipo_entero))  # <class 'int'>
Integers can be positive, negative, or zero. Examples: 100, 260, -50, 0

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Float (FLOAT)

Stores numbers with decimal points (real numbers). 
variable_de_tipo_real = 54.8
print(f"Variable de tipo real: {variable_de_tipo_real}")
print(type(variable_de_tipo_real))  # <class 'float'>
Floats can represent both whole numbers and decimals. Examples: 1.24, 2.0, 5.7, 3.14159

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String (STRING)

Stores text and character sequences. 
variable_de_tipo_caracteres = "Un saludo muy especial a todos los coders"
print(f"Variable de tipo caracteres: {variable_de_tipo_caracteres}")
print(type(variable_de_tipo_caracteres))  # <class 'str'>
Strings can be enclosed in single quotes ('text') or double quotes ("text"). Both are valid in Python.

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Boolean (BOOL)

Stores logical values - either True or False. 
variable_de_tipo_booleano = True
print(f"Variable de tipo booleano: {variable_de_tipo_booleano}")
print(type(variable_de_tipo_booleano))  # <class 'bool'>
Booleans are commonly used in conditional statements and logical operations. Only two values are possible: True or False.

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Complete Example

Here’s a complete example demonstrating all variable types: 
# Declare variables of different types
variable_de_tipo_entero = 10
variable_de_tipo_real = 54.8
variable_de_tipo_caracteres = "Un saludo muy especial a todos los coders"
variable_de_tipo_booleano = True

# Display variables and their types
print(f"Variable de tipo entero: {variable_de_tipo_entero}")
print(f"Variable de tipo real: {variable_de_tipo_real}")
print(f"Variable de tipo caracteres: {variable_de_tipo_caracteres}")
print(f"Variable de tipo booleano: {variable_de_tipo_booleano}")

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Variable Naming Conventions

Python variable names should:
  • Start with a letter or underscore
  • Contain only letters, numbers, and underscores
  • Be descriptive and use snake_case for multi-word names
  • Avoid Python reserved keywords

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Type Checking

You can check the type of any variable using the type() function: 
variable1 = 100
variable2 = 3.14
variable3 = "Hello"
variable4 = False

print(type(variable1))  # <class 'int'>
print(type(variable2))  # <class 'float'>
print(type(variable3))  # <class 'str'>
print(type(variable4))  # <class 'bool'>

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Key Takeaways

  • INT: Whole numbers only (e.g., 100, 260)
  • FLOAT: Numbers with decimals (e.g., 1.24, 5.7)
  • STRING: Text values (e.g., 'Juan', 'Compras')
  • BOOL: Logical values (True or False)

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