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The following functions are defined in the warnings module:
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warnings
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warn(message[, category[, stacklevel]])
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Issues a warning message is a string containing the warning message, category is the warning class (such as DeprecationWarning), and stacklevel is an integer that specifies the stack frame from which the warning message should originate By default, category is UserWarning and stacklevel is 1
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warn_explicit(message, category, filename, lineno[, module[, registry]])
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This is a low-level version of the warn() function message and category have the same meaning as for warn() filename, lineno, and module explicitly specify the location of the warning registry is an object representing all the currently active filters If registry is omitted, the warning message is not suppressed
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showwarning(message, category, filename, lineno[, file])
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Writes a warning to a file If file is omitted, the warning is printed to sysstderr
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formatwarning(message, category, filename, lineno)
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Creates the formatted string that is printed when a warning is issued
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filterwarnings(action[, message[, category[, module[, lineno[, append]]]]])
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Adds an entry to the list of warning filters action is one of 'error', 'ignore', 'always', 'default', 'once', or 'module'The following list provides an explanation of each:
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Action
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'error' 'ignore' 'always' 'default' 'module' 'once'
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Description
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Convert the warning into an exception Ignore the warning Always print a warning message Print the warning once for each location where the warning occurs Print the warning once for each module in which the warning occurs Print the warning once regardless of where it occurs
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message is a regular expression string that is used to match against the warning message category is a warning class such as DeprecationError module is a regular expression string that is matched against the module name lineno is a specific line number or 0 to match against all lines append specifies that the filter should be appended to the list of all filters (checked last) By default, new filters are added to the beginning of the filter list If any argument is omitted, it defaults to a value that matches all warnings
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resetwarnings()
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Resets all the warning filtersThis discards all previous calls to filterwarnings() as well as options specified with W
Notes
The list of currently active filters is found in the warningsfilters variable When warnings are converted to exceptions, the warning category becomes the exception type For instance, an error on DeprecationWarning will raise a DeprecationWarning exception
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13 Python Runtime Services
The W option can be used to specify a warning filter on the command lineThe general format of this option is
-Waction:message:category:module:lineno
where each part has the same meaning as for the filterwarning() function However, in this case, the message and module fields specify substrings (instead of regular expressions) for the first part of the warning message and module name to be filtered, respectively
weakref
The weakref module is used to provide support for weak references Normally, a reference to an object causes its reference count to increase effectively keeping the object alive until the reference goes away A weak reference, on the other hand, provides a way of referring to an object without increasing its reference countThis can be useful in certain kinds of applications that must manage objects in unusual ways For example, in an object-oriented program, where you might implement a relationship such as the Observer pattern, a weak reference can be used to avoid the creation of reference cycles An example of this is shown in the Object Memory Management section of 7 A weak reference is created using the weakrefref() function as follows:
>>> class A: pass >>> a = A() >>> ar = weakrefref(a) # Create a weak reference to a >>> print ar <weakref at 0x135a24; to 'instance' at 0x12ce0c>
Once a weak reference is created, the original object can be obtained from the weak reference by simply calling it as a function with no arguments If the underlying object still exists, it will be returned Otherwise, None is returned to indicate that the original object no longer exists For example:
>>> print ar() # Print original object <_ _main_ _A instance at 12ce0c> >>> del a # Delete the original object >>> print ar() # a is gone, so this now returns None None >>>
The following functions are defined by the weakref module:
ref(object[, callback])
Creates a weak reference to object callback is an optional function that will be called when object is about to be destroyed If supplied, this function should accept a single argument, which is the corresponding weak reference object More than one weak reference may refer to the same object In this case, the callback functions will be called in order from the most recently applied reference to the oldest reference object can be obtained from a weak reference by calling the returned weak reference object as a function with no arguments If the original object no longer exists, None