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warnings.py
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"""Python part of the warnings subsystem.""" import sys __all__ = ["warn", "warn_explicit", "showwarning", "formatwarning", "filterwarnings", "simplefilter", "resetwarnings", "catch_warnings"] def showwarning(message, category, filename, lineno, file=None, line=None): """Hook to write a warning to a file; replace if you like.""" msg = WarningMessage(message, category, filename, lineno, file, line) _showwarnmsg_impl(msg) def formatwarning(message, category, filename, lineno, line=None): """Function to format a warning the standard way.""" msg = WarningMessage(message, category, filename, lineno, None, line) return _formatwarnmsg_impl(msg) def _showwarnmsg_impl(msg): file = msg.file if file is None: file = sys.stderr if file is None: # sys.stderr is None when run with pythonw.exe: # warnings get lost return text = _formatwarnmsg(msg) try: file.write(text) except OSError: # the file (probably stderr) is invalid - this warning gets lost. pass def _formatwarnmsg_impl(msg): s = ("%s:%s: %s: %s\n" % (msg.filename, msg.lineno, msg.category.__name__, msg.message)) if msg.line is None: try: import linecache line = linecache.getline(msg.filename, msg.lineno) except Exception: # When a warning is logged during Python shutdown, linecache # and the import machinery don't work anymore line = None linecache = None else: line = msg.line if line: line = line.strip() s += " %s\n" % line if msg.source is not None: try: import tracemalloc tb = tracemalloc.get_object_traceback(msg.source) except Exception: # When a warning is logged during Python shutdown, tracemalloc # and the import machinery don't work anymore tb = None if tb is not None: s += 'Object allocated at (most recent call first):\n' for frame in tb: s += (' File "%s", lineno %s\n' % (frame.filename, frame.lineno)) try: if linecache is not None: line = linecache.getline(frame.filename, frame.lineno) else: line = None except Exception: line = None if line: line = line.strip() s += ' %s\n' % line return s # Keep a reference to check if the function was replaced _showwarning_orig = showwarning def _showwarnmsg(msg): """Hook to write a warning to a file; replace if you like.""" try: sw = showwarning except NameError: pass else: if sw is not _showwarning_orig: # warnings.showwarning() was replaced if not callable(sw): raise TypeError("warnings.showwarning() must be set to a " "function or method") sw(msg.message, msg.category, msg.filename, msg.lineno, msg.file, msg.line) return _showwarnmsg_impl(msg) # Keep a reference to check if the function was replaced _formatwarning_orig = formatwarning def _formatwarnmsg(msg): """Function to format a warning the standard way.""" try: fw = formatwarning except NameError: pass else: if fw is not _formatwarning_orig: # warnings.formatwarning() was replaced return fw(msg.message, msg.category, msg.filename, msg.lineno, line=msg.line) return _formatwarnmsg_impl(msg) def filterwarnings(action, message="", category=Warning, module="", lineno=0, append=False): """Insert an entry into the list of warnings filters (at the front). 'action' -- one of "error", "ignore", "always", "default", "module", or "once" 'message' -- a regex that the warning message must match 'category' -- a class that the warning must be a subclass of 'module' -- a regex that the module name must match 'lineno' -- an integer line number, 0 matches all warnings 'append' -- if true, append to the list of filters """ import re assert action in ("error", "ignore", "always", "default", "module", "once"), "invalid action: %r" % (action,) assert isinstance(message, str), "message must be a string" assert isinstance(category, type), "category must be a class" assert issubclass(category, Warning), "category must be a Warning subclass" assert isinstance(module, str), "module must be a string" assert isinstance(lineno, int) and lineno >= 0, \ "lineno must be an int >= 0" _add_filter(action, re.compile(message, re.I), category, re.compile(module), lineno, append=append) def simplefilter(action, category=Warning, lineno=0, append=False): """Insert a simple entry into the list of warnings filters (at the front). A simple filter matches all modules and messages. 'action' -- one of "error", "ignore", "always", "default", "module", or "once" 'category' -- a class that the warning must be a subclass of 'lineno' -- an integer line number, 0 matches all warnings 'append' -- if true, append to the list of filters """ assert action in ("error", "ignore", "always", "default", "module", "once"), "invalid action: %r" % (action,) assert isinstance(lineno, int) and lineno >= 0, \ "lineno must be an int >= 0" _add_filter(action, None, category, None, lineno, append=append) def _add_filter(*item, append): # Remove possible duplicate filters, so new one will be placed # in correct place. If append=True and duplicate exists, do nothing. if not append: try: filters.remove(item) except ValueError: pass filters.insert(0, item) else: if item not in filters: filters.append(item) _filters_mutated() def resetwarnings(): """Clear the list of warning filters, so that no filters are active.""" filters[:] = [] _filters_mutated() class _OptionError(Exception): """Exception used by option processing helpers.""" pass # Helper to process -W options passed via sys.warnoptions def _processoptions(args): for arg in args: try: _setoption(arg) except _OptionError as msg: print("Invalid -W option ignored:", msg, file=sys.stderr) # Helper for _processoptions() def _setoption(arg): import re parts = arg.split(':') if len(parts) > 5: raise _OptionError("too many fields (max 5): %r" % (arg,)) while len(parts) < 5: parts.append('') action, message, category, module, lineno = [s.strip() for s in parts] action = _getaction(action) message = re.escape(message) category = _getcategory(category) module = re.escape(module) if module: module = module + '$' if lineno: try: lineno = int(lineno) if lineno < 0: raise ValueError except (ValueError, OverflowError): raise _OptionError("invalid lineno %r" % (lineno,)) else: lineno = 0 filterwarnings(action, message, category, module, lineno) # Helper for _setoption() def _getaction(action): if not action: return "default" if action == "all": return "always" # Alias for a in ('default', 'always', 'ignore', 'module', 'once', 'error'): if a.startswith(action): return a raise _OptionError("invalid action: %r" % (action,)) # Helper for _setoption() def _getcategory(category): import re if not category: return Warning if re.match("^[a-zA-Z0-9_]+$", category): try: cat = eval(category) except NameError: raise _OptionError("unknown warning category: %r" % (category,)) else: i = category.rfind(".") module = category[:i] klass = category[i+1:] try: m = __import__(module, None, None, [klass]) except ImportError: raise _OptionError("invalid module name: %r" % (module,)) try: cat = getattr(m, klass) except AttributeError: raise _OptionError("unknown warning category: %r" % (category,)) if not issubclass(cat, Warning): raise _OptionError("invalid warning category: %r" % (category,)) return cat def _is_internal_frame(frame): """Signal whether the frame is an internal CPython implementation detail.""" filename = frame.f_code.co_filename return 'importlib' in filename and '_bootstrap' in filename def _next_external_frame(frame): """Find the next frame that doesn't involve CPython internals.""" frame = frame.f_back while frame is not None and _is_internal_frame(frame): frame = frame.f_back return frame # Code typically replaced by _warnings def warn(message, category=None, stacklevel=1, source=None): """Issue a warning, or maybe ignore it or raise an exception.""" # Check if message is already a Warning object if isinstance(message, Warning): category = message.__class__ # Check category argument if category is None: category = UserWarning if not (isinstance(category, type) and issubclass(category, Warning)): raise TypeError("category must be a Warning subclass, " "not '{:s}'".format(type(category).__name__)) # Get context information try: if stacklevel <= 1 or _is_internal_frame(sys._getframe(1)): # If frame is too small to care or if the warning originated in # internal code, then do not try to hide any frames. frame = sys._getframe(stacklevel) else: frame = sys._getframe(1) # Look for one frame less since the above line starts us off. for x in range(stacklevel-1): frame = _next_external_frame(frame) if frame is None: raise ValueError except ValueError: globals = sys.__dict__ lineno = 1 else: globals = frame.f_globals lineno = frame.f_lineno if '__name__' in globals: module = globals['__name__'] else: module = "<string>" filename = globals.get('__file__') if filename: fnl = filename.lower() if fnl.endswith(".pyc"): filename = filename[:-1] else: if module == "__main__": try: filename = sys.argv[0] except AttributeError: # embedded interpreters don't have sys.argv, see bug #839151 filename = '__main__' if not filename: filename = module registry = globals.setdefault("__warningregistry__", {}) warn_explicit(message, category, filename, lineno, module, registry, globals, source) def warn_explicit(message, category, filename, lineno, module=None, registry=None, module_globals=None, source=None): lineno = int(lineno) if module is None: module = filename or "<unknown>" if module[-3:].lower() == ".py": module = module[:-3] # XXX What about leading pathname? if registry is None: registry = {} if registry.get('version', 0) != _filters_version: registry.clear() registry['version'] = _filters_version if isinstance(message, Warning): text = str(message) category = message.__class__ else: text = message message = category(message) key = (text, category, lineno) # Quick test for common case if registry.get(key): return # Search the filters for item in filters: action, msg, cat, mod, ln = item if ((msg is None or msg.match(text)) and issubclass(category, cat) and (mod is None or mod.match(module)) and (ln == 0 or lineno == ln)): break else: action = defaultaction # Early exit actions if action == "ignore": registry[key] = 1 return # Prime the linecache for formatting, in case the # "file" is actually in a zipfile or something. import linecache linecache.getlines(filename, module_globals) if action == "error": raise message # Other actions if action == "once": registry[key] = 1 oncekey = (text, category) if onceregistry.get(oncekey): return onceregistry[oncekey] = 1 elif action == "always": pass elif action == "module": registry[key] = 1 altkey = (text, category, 0) if registry.get(altkey): return registry[altkey] = 1 elif action == "default": registry[key] = 1 else: # Unrecognized actions are errors raise RuntimeError( "Unrecognized action (%r) in warnings.filters:\n %s" % (action, item)) # Print message and context msg = WarningMessage(message, category, filename, lineno, source) _showwarnmsg(msg) class WarningMessage(object): _WARNING_DETAILS = ("message", "category", "filename", "lineno", "file", "line", "source") def __init__(self, message, category, filename, lineno, file=None, line=None, source=None): local_values = locals() for attr in self._WARNING_DETAILS: setattr(self, attr, local_values[attr]) self._category_name = category.__name__ if category else None def __str__(self): return ("{message : %r, category : %r, filename : %r, lineno : %s, " "line : %r}" % (self.message, self._category_name, self.filename, self.lineno, self.line)) class catch_warnings(object): """A context manager that copies and restores the warnings filter upon exiting the context. The 'record' argument specifies whether warnings should be captured by a custom implementation of warnings.showwarning() and be appended to a list returned by the context manager. Otherwise None is returned by the context manager. The objects appended to the list are arguments whose attributes mirror the arguments to showwarning(). The 'module' argument is to specify an alternative module to the module named 'warnings' and imported under that name. This argument is only useful when testing the warnings module itself. """ def __init__(self, *, record=False, module=None): """Specify whether to record warnings and if an alternative module should be used other than sys.modules['warnings']. For compatibility with Python 3.0, please consider all arguments to be keyword-only. """ self._record = record self._module = sys.modules['warnings'] if module is None else module self._entered = False def __repr__(self): args = [] if self._record: args.append("record=True") if self._module is not sys.modules['warnings']: args.append("module=%r" % self._module) name = type(self).__name__ return "%s(%s)" % (name, ", ".join(args)) def __enter__(self): if self._entered: raise RuntimeError("Cannot enter %r twice" % self) self._entered = True self._filters = self._module.filters self._module.filters = self._filters[:] self._module._filters_mutated() self._showwarning = self._module.showwarning self._showwarnmsg_impl = self._module._showwarnmsg_impl if self._record: log = [] self._module._showwarnmsg_impl = log.append # Reset showwarning() to the default implementation to make sure # that _showwarnmsg() calls _showwarnmsg_impl() self._module.showwarning = self._module._showwarning_orig return log else: return None def __exit__(self, *exc_info): if not self._entered: raise RuntimeError("Cannot exit %r without entering first" % self) self._module.filters = self._filters self._module._filters_mutated() self._module.showwarning = self._showwarning self._module._showwarnmsg_impl = self._showwarnmsg_impl # filters contains a sequence of filter 5-tuples # The components of the 5-tuple are: # - an action: error, ignore, always, default, module, or once # - a compiled regex that must match the warning message # - a class representing the warning category # - a compiled regex that must match the module that is being warned # - a line number for the line being warning, or 0 to mean any line # If either if the compiled regexs are None, match anything. _warnings_defaults = False try: from _warnings import (filters, _defaultaction, _onceregistry, warn, warn_explicit, _filters_mutated) defaultaction = _defaultaction onceregistry = _onceregistry _warnings_defaults = True except ImportError: filters = [] defaultaction = "default" onceregistry = {} _filters_version = 1 def _filters_mutated(): global _filters_version _filters_version += 1 # Module initialization _processoptions(sys.warnoptions) if not _warnings_defaults: silence = [ImportWarning, PendingDeprecationWarning] silence.append(DeprecationWarning) for cls in silence: simplefilter("ignore", category=cls) bytes_warning = sys.flags.bytes_warning if bytes_warning > 1: bytes_action = "error" elif bytes_warning: bytes_action = "default" else: bytes_action = "ignore" simplefilter(bytes_action, category=BytesWarning, append=1) # resource usage warnings are enabled by default in pydebug mode if hasattr(sys, 'gettotalrefcount'): resource_action = "always" else: resource_action = "ignore" simplefilter(resource_action, category=ResourceWarning, append=1) del _warnings_defaults