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"""
Handle loading a package from system or from the bundled copy
"""
import imp
_SEARCH_PATH = ['pkg_resources._vendor.packaging', 'packaging']
def _find_module(name, path=None):
"""
Alternative to `imp.find_module` that can also search in subpackages.
"""
parts = name.split('.')
for part in parts:
if path is not None:
path = [path]
fh, path, descr = imp.find_module(part, path)
return fh, path, descr
def _import_in_place(search_path=_SEARCH_PATH):
for mod_name in search_path:
try:
mod_info = _find_module(mod_name)
except ImportError:
continue
imp.load_module(__name__, *mod_info)
break
else:
raise ImportError(
"The '{name}' package is required; "
"normally this is bundled with this package so if you get "
"this warning, consult the packager of your "
"distribution.".format(name=_SEARCH_PATH[-1]))
_import_in_place()
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