In [1]:
#FUNCTION
# A function is a block of code which only runs when it is called.

# You can pass data, known as parameters, into a function.

# A function can return data as a result.
In [2]:
#function is define using def keyword.
def hello(greeting):
    return greeting
In [3]:
#calling the function
hello("hello")
Out[3]:
'hello'
In [4]:
#defining a function with default value.
def hello_func(greeting, name='kushagra'):
    return '{}, {}'.format(greeting,name)
In [5]:
hello_func('hi')
Out[5]:
'hi, kushagra'
In [6]:
print(hello_func('hi','Jack'))

hi, Jack
In [7]:
#Use *args - for variable number of arguments
#Use *kwargs - for variable number of keyword arguments
def student_info(*args, **kwargs):
    print(args)
    print(kwargs)
#student_info function accepting *args & **kwargs and printing it.
In [8]:
student_info('Math', 'Art', name='Jean', age=23)

('Math', 'Art')
{'name': 'Jean', 'age': 23}
In [9]:
#list
courses=['Math','Art']
#dictionary
info={'name': 'jane', 'age': 25}
In [10]:
#passing courses list and info dictionary to our function student_info
student_info(courses,info)
#all these are passed as an argument. 

(['Math', 'Art'], {'name': 'jane', 'age': 25})
{}
In [11]:
#so we need to specify arguments and keyword arguments
student_info(*courses,**info)

('Math', 'Art')
{'name': 'jane', 'age': 25}