def deprecation(message): warnings.warn(message, DeprecationWarning, level=2)
This makes the warning refer to deprecation()'s caller, rather than to the source of deprecation() itself (since the latter would defeat the purpose of the warning message).
__warningregistry__
dictionary of
the module). The module name defaults to the filename with .py
stripped; if no registry is passed, the warning is never suppressed.
showwarning(message, category, filename,
lineno)
and writes the resulting string to file, which
defaults to sys.stderr
. You may replace this function with an
alternative implementation by assigning to
warnings.showwarning
.