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.
Easiest way would be as the warnings module suggests here :
with warnings.catch_warnings():
warnings.simplefilter("ignore")
import paramiko
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
To filter only a specific warning:
with warnings.catch_warnings():
warnings.simplefilter('ignore', SpecificWarningObject)
#do something that raises a Warning
The most flexible way is to combine warnings.filterwarnings() with the warnings.catch_warnings() context manager. This way you ge the flexibility of filterwarnings
but the filtering is only applied inside the with
block:
import warnings
from Crypto.pct_warnings import RandomPool_DeprecationWarning
with warnings.catch_warnings():
warnings.filterwarnings(
action='ignore',
category=RandomPool_DeprecationWarning,
message='This application uses RandomPool, which is BROKEN in older releases')
# Do stuff that causes the warning
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