add import_module from imbortlib and backport for py2.6

This commit is contained in:
Alan Hamlett 2014-12-22 11:43:17 -06:00
parent 45bfd7d940
commit f6f090ee1f

View file

@ -40,3 +40,38 @@ elif is_py3:
return str(text)
open = open
basestring = (str, bytes)
try:
from importlib import import_module
except ImportError:
def _resolve_name(name, package, level):
"""Return the absolute name of the module to be imported."""
if not hasattr(package, 'rindex'):
raise ValueError("'package' not set to a string")
dot = len(package)
for x in xrange(level, 1, -1):
try:
dot = package.rindex('.', 0, dot)
except ValueError:
raise ValueError("attempted relative import beyond top-level "
"package")
return "%s.%s" % (package[:dot], name)
def import_module(name, package=None):
"""Import a module.
The 'package' argument is required when performing a relative import.
It specifies the package to use as the anchor point from which to
resolve the relative import to an absolute import.
"""
if name.startswith('.'):
if not package:
raise TypeError("relative imports require the 'package' "
+ "argument")
level = 0
for character in name:
if character != '.':
break
level += 1
name = _resolve_name(name[level:], package, level)
__import__(name)
return sys.modules[name]