Argthtjtr

I am new to Python and I am trying to figure out why the value of entry in the following code is set to "1" at the top of the code, and why when I press "0" as the first and only digit when testing the code the "sum" gets to be "0" and not "1" when the "entry" is already bound up with number of “1”.
Also, what is entry called? A function?
Best regards

entry = 1

total = 0

while entry > 0:

    entry = int(input('Enter a number: '))

    total += entry

print('The sum of all numbers =', total)

entry is a variable.

It has been set to 1 to enter into the while loop. For while loop to run you need condition to be True. So it evaluates 1 > 0 which is True and enters into the loop.

As value of entry is overriden in while loop, it takes the value from user input.
As you said if you press 0 the value of entry will become 0 instead of 1 and the will get added to sum which is 0 so 0+0 will return 0.

You can set it to any value greater than Zero.

Here Entry is basically used as a flag, which is set to True so that the While loop can run continuously untill 0(zero) is passed as a False value for Entry variable, which i turns than stops the While loop and return Total Sum.

entry is variable. It is 1 after entry = 1. So first time inside while loop entry > 0 is true and you go inside loop and read one number, and assign it to entry. Now if you enter 0 then entry is 0, and 0+0 is 0, so total is 0, and entry > 0 is false, so you fall out of while loop and print: "The sum of all numbers =0`.

But but but: question "why is entry set to value of 1" I cannot answer. You must go ask person who wrote this code and ask, "why is entry set to value of 1?" and maybe then you get answer. But I cannot give you that answer.

To me it looks like silly code written for silly reasons. I don't know.

The initial value of entry is set 1 and on the other hand you are also taking input with the same variable. So, whenever you are putting 0 on it the entry variable becoming 0 as initial value.
total is already set as 0 and it add the entry value which is also 0 so the result become 0.
So when the loop goes back & check its condition entry > 0 becoming 0 > 0 which is false.

so the code does something like this,

You Code

entry = 1

total = 0

while entry > 0:

    entry = int(input('Enter a number: '))

    total += entry

print('The sum of all numbers =', total)

First Attempt

entry = 1

total = 0

while entry > 0: # 1 > 0 because entry = 1

    entry = int(input('Enter a number: ')) # entry is becoming 0

    total += entry # total = 0, because entry is 0 now

print('The sum of all numbers =', total)

Last Attempt

entry = 1

total = 0

while entry > 0: # 0 > 0 False because entry = 0

    entry = int(input('Enter a number: '))

    total += entry

print('The sum of all numbers =', total)

Output

>>> The sum of all numbers = 0