How to get rid of specific warning messages in python while keeping all other warnings as normal?

I am doing some simple math recessively in a python script and am getting the follow warning:

> "Warning: divide by zero encountered in divide".

To provide some context, I am taking two values and trying to find the percent difference in value (a - b) / a and if its above a certain range then process it, but sometimes the value of a or b is zero.

I want to get rid of this specific warning (at a specific line) but all the information I have found so far seems to show me how to stop all warnings (which I do not want).

When I used to write shell scripts, I could do something like this

code...
more code 2 > error.txt
even more code  

In that example, I would get the warnings for the 'code' and 'even more code' command but not for the second line.

Is this possible?

If Scipy is using the warnings module, then you can suppress specific warnings. Try this at the beginning of your program:

import warnings
warnings.filterwarnings("ignore", message="divide by zero encountered in divide")

If you want this to apply to only one section of code, then use the warnings context manager:

import warnings
with warnings.catch_warnings():
    warnings.filterwarnings("ignore", message="divide by zero encountered in divide")
    # .. your divide-by-zero code ..

I'd avoid the division-by-zero in the first place:

if a == 0:
    # Break out early

# Otherwise the ratio makes sense

If you do want to squash that particular numpy warning on a single line, numpy provides a way:

with numpy.errstate(divide='ignore'):
    # The problematic line

Blenders answer is perfectly fitting the problem. Maybe someone is interested in another general approach to catch specific warnings with either regex or the line number:

surpress a warning caused by a specific line, here line 113:

import warnings
warnings.simplefilter('ignore',lineno=113)

This approach has the disadvantage, that each time you change something in the code you need to readjust the lineno. The other option is to catch a warning using regex. The following code will return

import warnings
warnings.filterwarnings('ignore', message='.*show', )
warnings.warn('Do not do this!')
warnings.warn('Do not show this message')
>>> UserWarning: Do not do this!
        warnings.warn('Do not do this!')

The dot before the *-symbol is neccessary as otherwise an error is returned

error: nothing to repeat

which is discussed in this thread