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"""
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IPython extension: autoreload modules before executing the next line
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Try::
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%autoreload?
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for documentation.
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"""
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# Pauli Virtanen <pav@iki.fi>, 2008.
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# Thomas Heller, 2000.
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#
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# This IPython module is written by Pauli Virtanen, based on the autoreload
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# code by Thomas Heller.
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#------------------------------------------------------------------------------
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# Autoreload functionality
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#------------------------------------------------------------------------------
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import time, os, threading, sys, types, imp, inspect, traceback, atexit
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import weakref
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def _get_compiled_ext():
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"""Official way to get the extension of compiled files (.pyc or .pyo)"""
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for ext, mode, typ in imp.get_suffixes():
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if typ == imp.PY_COMPILED:
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return ext
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PY_COMPILED_EXT = _get_compiled_ext()
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class ModuleReloader(object):
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failed = {}
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"""Modules that failed to reload: {module: mtime-on-failed-reload, ...}"""
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modules = {}
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"""Modules specially marked as autoreloadable."""
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skip_modules = {}
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"""Modules specially marked as not autoreloadable."""
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check_all = True
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"""Autoreload all modules, not just those listed in 'modules'"""
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old_objects = {}
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"""(module-name, name) -> weakref, for replacing old code objects"""
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def check(self, check_all=False):
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"""Check whether some modules need to be reloaded."""
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if check_all or self.check_all:
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modules = sys.modules.keys()
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else:
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modules = self.modules.keys()
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for modname in modules:
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m = sys.modules.get(modname, None)
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if modname in self.skip_modules:
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continue
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if not hasattr(m, '__file__'):
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continue
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if m.__name__ == '__main__':
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# we cannot reload(__main__)
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continue
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filename = m.__file__
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dirname = os.path.dirname(filename)
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path, ext = os.path.splitext(filename)
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if ext.lower() == '.py':
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ext = PY_COMPILED_EXT
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filename = os.path.join(dirname, path + PY_COMPILED_EXT)
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if ext != PY_COMPILED_EXT:
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continue
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try:
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pymtime = os.stat(filename[:-1]).st_mtime
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if pymtime <= os.stat(filename).st_mtime:
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continue
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if self.failed.get(filename[:-1], None) == pymtime:
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continue
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except OSError:
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continue
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try:
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superreload(m, reload, self.old_objects)
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if filename[:-1] in self.failed:
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del self.failed[filename[:-1]]
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except:
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print >> sys.stderr, "[autoreload of %s failed: %s]" % (
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modname, traceback.format_exc(1))
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self.failed[filename[:-1]] = pymtime
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#------------------------------------------------------------------------------
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# superreload
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#------------------------------------------------------------------------------
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def update_function(old, new):
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"""Upgrade the code object of a function"""
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for name in ['func_code', 'func_defaults', 'func_doc',
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'func_closure', 'func_globals', 'func_dict']:
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try:
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setattr(old, name, getattr(new, name))
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except (AttributeError, TypeError):
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pass
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def update_class(old, new):
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"""Replace stuff in the __dict__ of a class, and upgrade
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method code objects"""
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for key in old.__dict__.keys():
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old_obj = getattr(old, key)
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try:
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new_obj = getattr(new, key)
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except AttributeError:
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# obsolete attribute: remove it
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try:
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delattr(old, key)
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except (AttributeError, TypeError):
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pass
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continue
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if update_generic(old_obj, new_obj): continue
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try:
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setattr(old, key, getattr(new, key))
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except (AttributeError, TypeError):
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pass # skip non-writable attributes
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def update_property(old, new):
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"""Replace get/set/del functions of a property"""
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update_generic(old.fdel, new.fdel)
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update_generic(old.fget, new.fget)
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update_generic(old.fset, new.fset)
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def isinstance2(a, b, typ):
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return isinstance(a, typ) and isinstance(b, typ)
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UPDATE_RULES = [
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(lambda a, b: isinstance2(a, b, types.ClassType),
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update_class),
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(lambda a, b: isinstance2(a, b, types.TypeType),
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update_class),
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(lambda a, b: isinstance2(a, b, types.FunctionType),
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update_function),
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(lambda a, b: isinstance2(a, b, property),
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update_property),
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(lambda a, b: isinstance2(a, b, types.MethodType),
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lambda a, b: update_function(a.im_func, b.im_func)),
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]
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def update_generic(a, b):
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for type_check, update in UPDATE_RULES:
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if type_check(a, b):
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update(a, b)
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return True
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return False
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class StrongRef(object):
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def __init__(self, obj):
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self.obj = obj
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def __call__(self):
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return self.obj
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def superreload(module, reload=reload, old_objects={}):
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"""Enhanced version of the builtin reload function.
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superreload remembers objects previously in the module, and
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- upgrades the class dictionary of every old class in the module
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- upgrades the code object of every old function and method
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- clears the module's namespace before reloading
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"""
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# collect old objects in the module
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for name, obj in module.__dict__.items():
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if not hasattr(obj, '__module__') or obj.__module__ != module.__name__:
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continue
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key = (module.__name__, name)
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try:
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old_objects.setdefault(key, []).append(weakref.ref(obj))
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except TypeError:
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# weakref doesn't work for all types;
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# create strong references for 'important' cases
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if isinstance(obj, types.ClassType):
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old_objects.setdefault(key, []).append(StrongRef(obj))
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# reload module
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try:
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# clear namespace first from old cruft
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old_name = module.__name__
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module.__dict__.clear()
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module.__dict__['__name__'] = old_name
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except (TypeError, AttributeError, KeyError):
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pass
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module = reload(module)
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# iterate over all objects and update functions & classes
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for name, new_obj in module.__dict__.items():
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key = (module.__name__, name)
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if key not in old_objects: continue
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new_refs = []
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for old_ref in old_objects[key]:
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old_obj = old_ref()
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if old_obj is None: continue
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new_refs.append(old_ref)
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update_generic(old_obj, new_obj)
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if new_refs:
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old_objects[key] = new_refs
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else:
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del old_objects[key]
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return module
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reloader = ModuleReloader()
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#------------------------------------------------------------------------------
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# IPython connectivity
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#------------------------------------------------------------------------------
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import IPython.ipapi
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ip = IPython.ipapi.get()
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autoreload_enabled = False
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def runcode_hook(self):
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if not autoreload_enabled:
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raise IPython.ipapi.TryNext
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try:
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reloader.check()
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except:
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pass
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def enable_autoreload():
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global autoreload_enabled
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autoreload_enabled = True
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def disable_autoreload():
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global autoreload_enabled
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autoreload_enabled = False
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def autoreload_f(self, parameter_s=''):
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r""" %autoreload => Reload modules automatically
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%autoreload
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Reload all modules (except those excluded by %aimport) automatically now.
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%autoreload 1
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Reload all modules imported with %aimport every time before executing
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the Python code typed.
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%autoreload 2
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Reload all modules (except those excluded by %aimport) every time
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before executing the Python code typed.
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Reloading Python modules in a reliable way is in general difficult,
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and unexpected things may occur. %autoreload tries to work
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around common pitfalls by replacing code objects of functions
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previously in the module with new versions. This makes the following
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things to work:
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- Functions and classes imported via 'from xxx import foo' are upgraded
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to new versions when 'xxx' is reloaded.
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- Methods and properties of classes are upgraded on reload, so that
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calling 'c.foo()' on an object 'c' created before the reload causes
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the new code for 'foo' to be executed.
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Some of the known remaining caveats are:
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- Replacing code objects does not always succeed: changing a @property
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in a class to an ordinary method or a method to a member variable
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can cause problems (but in old objects only).
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- Functions that are removed (eg. via monkey-patching) from a module
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before it is reloaded are not upgraded.
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- C extension modules cannot be reloaded, and so cannot be
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autoreloaded.
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"""
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if parameter_s == '':
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reloader.check(True)
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elif parameter_s == '0':
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disable_autoreload()
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elif parameter_s == '1':
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reloader.check_all = False
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enable_autoreload()
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elif parameter_s == '2':
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reloader.check_all = True
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enable_autoreload()
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def aimport_f(self, parameter_s=''):
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"""%aimport => Import modules for automatic reloading.
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%aimport
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List modules to automatically import and not to import.
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%aimport foo
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Import module 'foo' and mark it to be autoreloaded for %autoreload 1
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%aimport -foo
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Mark module 'foo' to not be autoreloaded for %autoreload 1
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"""
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modname = parameter_s
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if not modname:
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to_reload = reloader.modules.keys()
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to_reload.sort()
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to_skip = reloader.skip_modules.keys()
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to_skip.sort()
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if reloader.check_all:
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print "Modules to reload:\nall-expect-skipped"
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else:
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print "Modules to reload:\n%s" % ' '.join(to_reload)
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print "\nModules to skip:\n%s" % ' '.join(to_skip)
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elif modname.startswith('-'):
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modname = modname[1:]
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try: del reloader.modules[modname]
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except KeyError: pass
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reloader.skip_modules[modname] = True
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else:
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try: del reloader.skip_modules[modname]
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except KeyError: pass
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reloader.modules[modname] = True
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mod = __import__(modname)
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ip.to_user_ns({modname: mod})
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def init():
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ip.expose_magic('autoreload', autoreload_f)
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ip.expose_magic('aimport', aimport_f)
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ip.set_hook('pre_runcode_hook', runcode_hook)
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init()
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