Little bit more about functions

• Till now we had look at fixed set of arguments

def add(number1, number2, number3):
    pass

## add(3,5,7)

• One solution looks like

def add(numbers):
    result = 0
    for number in numbers:
        result += number

# add([3,5,7])

• If we need a function, which behaves as shown below we have *args to the the rescue in python

add(1,2)

add(1,2,3)

add(1,2,3,4,5,6)

• A sample implementation of add numbers using *args

def add(*args):
    print(f"Type of args is {type(args)} and value is {args} ")
    result = 0
    for arg in args:
        result += arg
    return result

print(add(1))
print(add(1,2))
print(add(1,2,3,4,5,6,7,8,9))

• Now if want a function with variable arguments with names

add(number1=1, number2=2, number3=3)

Developer Work-Organization Workflow

Version Control Systems

• This is a software system where developers commit (send/store) the source code of the project.
• Version Control Systems help in navigating through history of changes done in the code
• It also helps in multiple team members working on same project.

How to test the code

• Manually: debug the code by passing multiple inputs and check all the conditions around
• Test Harness Tools/Unit Testing Tools: Every Language supports unit testing frameworks to test the written code.
  • pytest

Programming Exercise

• Create a account in GitHub
• Hacker Rank