could you explain what the purpose of this code is just by looking at it? [closed]

result = 0
for num in numbers:
is num < 0:
result = result + 1


is

if

3 Answers
3

That isn't valid Python - you need to preserve the whitespace/tabbing, and you have is instead of if:

is

if

result = 0
for num in numbers:
if num < 0:
result = result + 1


The code will count how many negative numbers are in the list numbers. For example:

numbers

>>> numbers = [-2,-1,0,1,2,3,4]
>>> for num in numbers:
... if num < 0:
... result = result + 1
...
>>> result
2


This previous question shows a simpler algorithm using a list comprehension:
Count negative values in a list of integers using Python?

sum

sum(1 for i in num if i < 0)

list(range(-2000000, 2000000))

i dont know where has numbers list (probably) been defined, but i guess it may contains user input numbers.
the loop is counting the number of negative numbers in the numbers list, and store it in result variable.

numbers

numbers

result

What you posted is not valid python code you want if not is, see the explanation in comments:

if

is

result = 0 # Create a variable and assign it to zero
for num in numbers: # Iterate trough `numbers` list (or tuple or set..) whatever it is
if num < 0: # Check if the current element smaller than zero
result = result + 1 # if it is add 1 to variable `result`


And remember next time to ask a question please see How to Ask and How to create a Minimal, Complete, and Verifiable example

Alternatively you can use this:

result = sum(1 for i in numbers if i<0)


Also alternatively you can do abs(i)!=i instead of i<0

abs(i)!=i

i<0