Two Questions, *args and //=

[beginner721]

Hello,

Question one:
I want to use *args function, for multiple argument in math operation.
For example:

def plus(a,b):
    return a+b

#lets try

a=int(input("A: "))
b=int(input("B: "))
plus(a,b)

Its looking good but I want to use more arguments,not just a or not just b, add as many as you want

def plus(*args):
    return ?????
# am I think right or am I doing wrong :), what Can I do ?

And here is different easy question,

a=10
b=5

b//=a
print(b)

#now b = 0, why? whats this operator mean "//=" and in which situations it is used ?

Thank you ...

[BashBedlam]

*args allows you to have an unknown number of arguments and stores them in a tuple. Run this and see.

def show_args (x, *args) :
	print (f'x equals {x}')
	print (f'args equals {args}')

show_args (1, 3, 7, 13)

Output:
x equals 1
args equals (3, 7, 13)

// is called floor division and rounds the result of the division down to the nearest whole number.

print (13 / 2) # answer -> 6.5
print (13 // 2) # answer -> 6

[buran]

// is floor division.
//= is in-place version of floor division i.e. augmented assignment expression

b //= a

is the same as

b = b // a

PEP 577 Augmented assignment expressions

[buran]

Assuming you are not allowed to use sum(), you can iterate over args and calculate the result adding one number at a time.

[deanhystad]

def func(*args):
    print(args)

func('Hello')
func('a', 1, 3.14)

def func2(a, b, *args):
    print(args)

func2('a', 1, 3.14)

Output:
('Hello',)
('a', 1, 3.14)
(3.14,)

As you can see, args is a tuple that contains all the unbound position arguments. For your plus function you could do something like this:

def plus(*args):
    total = 0
    for arg in args:
        total += arg
    return total

print(plus(1, 2, 3, 4, 5))

Output:
15

Of course you would be better off using the sum() function which takes any number of arguments.

// is "floor" division. This is often mistakenly called integer division, but it works for integers and floats. In floor division you are guaranteed to not have a fraction in the result.
4//3 == 1, not 1.33333
5.0 // 2 == 2.0, not 2.5

Floor division has a lot of uses. You can use it to make change.

total = 3.68
dollars = total // 1
total -= dollars
quarters = total // 0.25
total -= quarters * 0.25
dimes = total // 0.1
total -= dimes * 0.1
nickels = total // 0.05
total = total - nickels * 0.05
pennies = total // 0.01
print(dollars, quarters, dimes, nickels, pennies)

Floor division is often used with modulo to get the remainder. There is even a function that combines the two; divmod()

total = 3.68
total = int(total * 100)
dollars, total = divmod(total, 100)
quarters, total = divmod(total, 25)
dimes, total = divmod(total, 10)
nickels, pennies = divmod(total, 5)
print(dollars, quarters, dimes, nickels, pennies)

[beginner721]

Thanks everyone...

def func(*args):
    print(args)

func('Hello')
func('a', 1, 3.14)

def func2(a, b, *args):
    print(args)

func2('a', 1, 3.14)

Output:
('Hello',)
('a', 1, 3.14)
(3.14,)

As you can see, args is a tuple that contains all the unbound position arguments. For your plus function you could do something like this:

def plus(*args):
    total = 0
    for arg in args:
        total += arg
    return total

print(plus(1, 2, 3, 4, 5))

Output:
15

Of course you would be better off using the sum() function which takes any number of arguments.

// is "floor" division. This is often mistakenly called integer division, but it works for integers and floats. In floor division you are guaranteed to not have a fraction in the result.
4//3 == 1, not 1.33333
5.0 // 2 == 2.0, not 2.5

Floor division has a lot of uses. You can use it to make change.

total = 3.68
dollars = total // 1
total -= dollars
quarters = total // 0.25
total -= quarters * 0.25
dimes = total // 0.1
total -= dimes * 0.1
nickels = total // 0.05
total = total - nickels * 0.05
pennies = total // 0.01
print(dollars, quarters, dimes, nickels, pennies)

Floor division is often used with modulo to get the remainder. There is even a function that combines the two; divmod()

total = 3.68
total = int(total * 100)
dollars, total = divmod(total, 100)
quarters, total = divmod(total, 25)
dimes, total = divmod(total, 10)
nickels, pennies = divmod(total, 5)
print(dollars, quarters, dimes, nickels, pennies)

Thanks, what can we do If we want users give us this arguments?
I want to use input function but also I want to use args

#this is normal type example, can you write again with args?
def plusplus():
    toplam=0
    while True:
        print("To exit press Q")
        a = (input("Number: "))
        if a=="q":
            break
        else:
            a=int(a)
            toplam+=a

        print(toplam)
    print("Toplama Tamamlandı")

plusplus()

Sorry for my weird questions, I am just trying to learn

[beginner721]

Assuming you are not allowed to use sum(), you can iterate over args and calculate the result adding one number at a time.

Thanks, can you give me a little example which have "sum()" function in it
or you can add sum() in my example,

[deanhystad]

Try looking it up. Looking things up, and more importantly, learning where to look will be more useful than somebody telling you how to do things.

[buran]

can you give me a little example which have "sum()" function in it

def plus(*args):
    return sum(args)

print(plus(1, 23, 4)) 
print(plus(*range(10)))

Output:
28
45

Basically this is just obfuscation of sum(), so I would not advise to do it for any reason other than pure learning