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Patch #1525766: correctly pass onerror arg to recursive calls

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of pkg.walk_packages. Also improve the docstrings.
This commit is contained in:
Georg Brandl 2006-07-25 10:22:34 +00:00
parent 2b2d2974e7
commit 69b9b677b0
1 changed files with 34 additions and 4 deletions
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38
Lib/pkgutil.py
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@ -69,7 +69,28 @@ def register(typ, func=None):
def walk_packages(path=None, prefix='', onerror=None): def walk_packages(path=None, prefix='', onerror=None):
"""Yield submodule names+loaders recursively, for path or sys.path""" """Yields (module_loader, name, ispkg) for all modules recursively
on path, or, if path is None, all accessible modules.
'path' should be either None or a list of paths to look for
modules in.
'prefix' is a string to output on the front of every module name
on output.
Note that this function must import all *packages* (NOT all
modules!) on the given path, in order to access the __path__
attribute to find submodules.
'onerror' is a function which gets called with one argument (the
name of the package which was being imported) if an ImportError
occurs trying to import a package. By default the ImportError is
caught and ignored.
Examples:
walk_packages() : list all modules python can access
walk_packages(ctypes.__path__, ctypes.__name__+'.') : list all submodules of ctypes
"""
def seen(p, m={}): def seen(p, m={}):
if p in m: if p in m:
@ -84,19 +105,28 @@ def seen(p, m={}):
__import__(name) __import__(name)
except ImportError: except ImportError:
if onerror is not None: if onerror is not None:
onerror() onerror(name)
else: else:
path = getattr(sys.modules[name], '__path__', None) or [] path = getattr(sys.modules[name], '__path__', None) or []
# don't traverse path items we've seen before # don't traverse path items we've seen before
path = [p for p in path if not seen(p)] path = [p for p in path if not seen(p)]
for item in walk_packages(path, name+'.'): for item in walk_packages(path, name+'.', onerror):
yield item yield item
def iter_modules(path=None, prefix=''): def iter_modules(path=None, prefix=''):
"""Yield submodule names+loaders for path or sys.path""" """Yields (module_loader, name, ispkg) for all submodules on path,
or, if path is None, all top-level modules on sys.path.
'path' should be either None or a list of paths to look for
modules in.
'prefix' is a string to output on the front of every module name
on output.
"""
if path is None: if path is None:
importers = iter_importers() importers = iter_importers()
else: else: