Types of parameters in python with examples

Marcus 150 Published: 11/10/2024

Types of parameters in python with examples

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In Python, a parameter is a value passed to a function when it's called. There are several types of parameters that can be used in Python:

Positional Parameters: These are the most common type of parameter and are required when calling a function. They are identified by their position in the function definition.

Example:

def greet(name):

print(f"Hello, {name}!")


greet("John")  # Output: Hello, John!
Keyword Parameters: These allow you to pass parameters to a function using keywords instead of positions. This can make your code more readable and easier to maintain.

Example:

def greet(name, message):

print(f"{message}, {name}!")


greet("John", "Good morning")  # Output: Good morning, John!
Default Parameters: These allow you to set a default value for a parameter in case one is not provided when calling the function.

Example:

def greet(name="World"):

print(f"Hello, {name}!")


greet()  # Output: Hello, World!


greet("John")  # Output: Hello, John!
Variable Number of Parameters: These allow you to pass a variable number of parameters to a function.

Example:

def sum_numbers(*numbers):

return sum(numbers)


print(sum_numbers(1, 2, 3))  # Output: 6


print(sum_numbers(1, 2, 3, 4))  # Output: 10
Named Variable Number of Parameters: These allow you to pass a variable number of parameters to a function with names.

Example:

def sum_numbers(**numbers):

return sum(numbers.values())


print(sum_numbers(a=1, b=2, c=3))  # Output: 6


print(sum_numbers(a=1, b=2, c=3, d=4))  # Output: 10
Lambda Functions: These are small anonymous functions that can be used to define small, one-off functions.

Example:

double = lambda x: x * 2

print(double(5))  # Output: 10
Generator Parameters: These allow you to pass parameters to a generator function using the yield statement.

Example:

def infinite_sequence(start=0):

n = start


while True:


yield n


n += 1


sequence = infinite_sequence()


print(next(sequence))  # Output: 0


print(next(sequence))  # Output: 1


print(next(sequence))  # Output: 2

In conclusion, there are several types of parameters that can be used in Python, each with its own unique characteristics and use cases. By understanding these different types, you'll be able to write more effective and efficient code.

What are the 5 types of arguments in Python function?

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In Python, a function can take various forms of arguments. These are categorized into five main types: Positional, Keyword, Default, Variable-length, and Arbitrary.

1. Positional Arguments

Positional arguments are the most common type. They are passed to a function based on their position or order in the function definition. In Python, you can call a function with positional arguments by passing values in the order they appear in the function definition. For example:

def greet(name, age):

print(f"Hello, {name}! You're {age} years old.")


greet("John", 30)

In this example, "John" is passed as the first argument (name) and 30 as the second argument (age).

2. Keyword Arguments

Keyword arguments allow you to pass arguments by specifying their names in addition to their position. This is useful when dealing with functions that have a large number of parameters or when you want to make your code more readable.

In Python, you can use keyword arguments by preceding each value with the name of the parameter it corresponds to. For example:

def greet(name, age):

print(f"Hello, {name}! You're {age} years old.")


greet(age=30, name="John")

3. Default Arguments

Default arguments are values that are assigned to a function's parameters if no value is provided when the function is called. This is useful for simplifying code and making it more readable.

In Python, you can define default values for a function's parameters by assigning them in the function definition. For example:

def greet(name="World", age=30):

print(f"Hello, {name}! You're {age} years old.")


greet()  # Outputs: Hello, World! You're 30 years old.


greet("John")  # Outputs: Hello, John! You're 30 years old.


greet(age=25)  # Outputs: Hello, World! You're 25 years old.

4. Variable-length Arguments

Variable-length arguments are a way to pass an arbitrary number of arguments to a function. In Python, you can use the * operator to capture variable-length arguments.

For example:

def greet(*args):

for name in args:


print(f"Hello, {name}!")


greet("John", "Jane", "Bob")

Outputs:
Hello, John!
Hello, Jane!
Hello, Bob!

5. Arbitrary Arguments

Arbitrary arguments are a way to pass an arbitrary number of keyword arguments to a function. In Python, you can use the ** operator to capture arbitrary arguments.

For example:

def greet(**kwargs):

for name, age in kwargs.items():


print(f"Hello, {name}! You're {age} years old.")


greet(name="John", age=30)

Outputs: Hello, John! You're 30 years old.

greet(name="Jane", age=25, occupation="Engineer")

Outputs:
Hello, Jane! You're 25 years old.
Hello, Engineer! (This will raise an error because "Engineer" is not a name)

In summary, Python functions can take various forms of arguments, including positional, keyword, default, variable-length, and arbitrary. Understanding these different types of arguments can help you write more robust and flexible code.

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