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Functions,Arguments,Module in Python

Functions are reusable blocks of code, Arguments are the actual data inputs passed into them, Modules are files containing Python code used to organize projects.

1. Functions:
A Python Function is a self-contained block of code designed to perform a specific task. Functions help break large programs into smaller, organized, and reusable parts to prevent repetitive code.

# Defining a function
def Tech():
    return "Hello, welcome back!"

# Calling the function
print(Tech())
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Explanation:

  • def is the keyword used to define a function.
  • Tech is the function name.
  • () indicates that the function takes no arguments.
  • return sends the result back to the caller.
  • print(Tech()) calls the function and displays the returned value.

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2. Arguments:

  • Arguments are the concrete values you pass into a function when calling it.

  • (Note: Parameters are the variable names inside the function definition, while arguments are the real values mapped to them).
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  • Positional Arguments: Assigned based strictly on the order they are passed.

def greet(name):
    print(name)

greet("Vinoth")
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  • Keyword Arguments: Passed explicitly using the parameter_name=value format, meaning order does not matter. 
def student(name, age):
    print(name, age)

student(age=21, name="Vinoth")
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  • Default Arguments: Fallback values defined in the function signature if an argument is missing during the call. 
def greet(name="Guest"):
    print(name)

greet()
greet("Vinoth")
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  • Arbitrary Arguments (*args and **kwargs): Allow a function to accept a dynamic, flexible number of inputs. 
def total(*numbers):
    print(sum(numbers))

total(10, 20, 30, 40)
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3. Modules:
A Module is simply a file containing Python statements and definitions (ending in .py) that you can import into other scripts. Modules let you logically organize your code base and share functionality across different files.
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  • Built-in Modules: Python comes pre-packaged with useful standard modules like math, random, or datetime.
  • Custom Modules: You can create your own file (e.g., mymodule.py) and import it elsewhere using import mymodule.

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