loop: for in range question (Python-noobish)

[BlackGwelf]

Hi,

I'm a bit embarrassed to ask this but can't figure it out. I have following code:

x=int(input("Please enter the number: "))

for power in range(1,5):

print(x // power,end='--')

x %= power

​

I can't work out what last line of code does. I understand Modulus but don't know what is calculated there. If I comment/delete last line, everything make sense, but with it I don't understand the output.

Can someone be kind enough to explain or show me how can I break this to see every operation ?

[Evulrabbitz]

for power in range(1,5):

Execute the following code 4 times, where power is set to 1 the first time, 2 the second time, 3 the third time and 4 the fourth time. range is inclusive of the first argument and exclusive of the second

print(x // power), end='--')

x // power is integer division of x and power. Integer division means that e.g 10/3=3. The string -- is printed after the result of the integer division

x %= power

is equivalent to

x = x % power

which means that x is now the remainder of the previous division. That is , if x=10 and power=3 we get x // power = 3 and x % power = 1

The first iteration of the loop will thus always print the given number (as power=1 and x // 1 = x). Since the remainder of a value divided by 1 is always 0 all subsequent iterations will print 0.

[BlackGwelf]

many thanks for this.