How to suppress a third-party warning using warnings.filterwarnings

Question

I am using Paramiko in my python code (for sftp). Everything works fine except that everytime I import or call a paramiko function. This warning would show up:

C:\Python26\lib\site-packages\Crypto\Util\randpool.py:40: RandomPool_Deprecation Warning: This application uses RandomPool, which is BROKEN in older releases.  S ee http://www.pycrypto.org/randpool-broken   RandomPool_DeprecationWarning) 

I know that this has to do with the fact that Paramiko is using some Deprecated functionalities of PyCrypto.

My question is, is there a way to suppress this warning programmatically ? I have tried this:

warnings.filterwarnings(action='ignore', \ category=DeprecationWarning, module='paramiko') 

and even this:

warnings.filterwarnings(action='ignore', \ category=DeprecationWarning, module='randpool') 

before 'import paramiko' statement and before paramiko-specific function calls, but nothing works. This warning keeps showing up no matter what. If it helps, here's the code in the third party library that prints the warning:

in randpool.py:

from Crypto.pct_warnings import RandomPool_DeprecationWarning import Crypto.Random import warnings  class RandomPool:     """Deprecated.  Use Random.new() instead.      See http://www.pycrypto.org/randpool-broken     """     def __init__(self, numbytes = 160, cipher=None, hash=None, file=None):         warnings.warn("This application uses RandomPool, which is BROKEN in older releases.  See http://www.pycrypto.org/randpool-broken",             RandomPool_DeprecationWarning) 

If you know a way around this, please help me shut this warning off.

Answer 1

Easiest way would be as the warnings module suggests here:

with warnings.catch_warnings():     warnings.simplefilter("ignore")     import paramiko 

Answer 2

The module argument to warnings.filterwarnings takes a case-sensitive regular expression which should match the fully qualified module name, so

warnings.filterwarnings(     action='ignore',     category=DeprecationWarning,     module=r'.*randpool' ) 

or

warnings.filterwarnings(     action='ignore',     category=DeprecationWarning,     module=r'Crypto\.Utils\.randpool' ) 

should work. You may need to write RandomPool_DeprecationWarning explicitly instead of DeprecationWarning if for some reason RandomPool_DeprecationWarning is not a subclass of DeprecationWarning.

You can also disable the warning on the command line when you invoke the script by passing the -W option to the interpreter like so:

$ python -W ignore::RandomPool_DeprecationWarning:Crypto.Utils.randpool: my_script.py 

The -W takes filters in the format action:message:category:module:lineno, where this time module must exactly match the (fully-qualified) module name where the warning is raised.

See https://docs.python.org/2/library/warnings.html?highlight=warnings#the-warnings-filter and https://docs.python.org/2/using/cmdline.html#cmdoption-w