BasicFunctionsPrograms,py, Python 3

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#python 3.5.2
#Functions in Python
#1)Simplest function
def add(x,y):
    return x+y
print(add(10,20))
#2)In python a function can return multiple values at at time
def add_sub(x,y):
    return x+y,x-y#these multiple values contitute a tuple
print(add_sub(10,20))
#3)different ways of passing args to function
def person_details(name,age):
    print('name: ',name)
    print('age: ',age)
person_details('Satish',31)#Positioned args
person_details(age=23,name='Ramesh')#Keyworded args

def person_details(name,age=18):#default args
    print('name: ',name)
    print('age: ',age)
person_details('Satish')#default args will be accessed
person_details('Navin',45)#customized args will be accessed

#4)Var-args functions:
def sum(*num):#variable args are stored in a tuple(here num)
    sum=0
    for e in num:
        sum=sum+e
    print('Sum = ',sum)
sum(1,2,3,4,5,6,7,8,9,10)
#biggest number from a list of numbers: 
def biggest_number(*list):
    big=list[0]
    for e in list:
        if big<e:
            big=e
    print('Max = ',big)
biggest_number(1,3,2,4,0,2,90,56,67,-90)

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Absolute running time: 0.24 sec, cpu time: 0.1 sec, memory peak: 6 Mb, absolute service time: 0,25 sec