Basic Python 24: Python Function Arguments Positional, Keywords and Default

Published: 01 October 2022
on channel: Testing Tutorialspoint

Python Function Arguments: Positional, Keywords and Default

Arguments:
----------
def greet(name, msg):
"""This function greets to
the person with the provided message"""
print("Hello", name + ', ' + msg)

greet("Monica", "Good morning!")

Variable Function Arguments:
----------------------------
functions had a fixed number of arguments. In Python, there are other ways to define a function that can take variable number of arguments.

Three different type forms

Python Default Arguments:

ex:
def greet(name, msg="Good morning!"):
"""
This function greets to
the person with the
provided message.

If the message is not provided,
it defaults to "Good
morning!"
"""

print("Hello", name + ', ' + msg)

greet("Kate")
greet("Bruce", "How do you do?")

Python Keyword Arguments:
-------------------------
2 keyword arguments
greet(name = "Bruce",msg = "How do you do?")

2 keyword arguments (out of order)
greet(msg = "How do you do?",name = "Bruce")

1 positional, 1 keyword argument
greet("Bruce", msg = "How do you do?")

Python Arbitrary Arguments:
---------------------------
we do not know in advance the number of arguments that will be passed into a function. Python allows us to handle this kind of situation through function calls with an arbitrary number of arguments.

In the function definition, we use an asterisk (*) before the parameter name to denote this kind of argument.
ex:
def greet(*names):
"""This function greets all
the person in the names tuple."""

names is a tuple with arguments
for name in names:
print("Hello", name)

greet("Monica", "Luke", "Steve", "John")

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