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import sys
import os
third_party = os.path.join(
os.path.dirname(os.path.dirname(__file__)),
'3rd-party')
new_python_path = os.path.join(third_party, 'new_python')
def load_new_module(module_name, python_version):
"""
Modules in the standard library that have been improved can be
loaded with this command. python_version is a sys.version_info
tuple, and if you need a newer version then we'll look in
../3rd-party/new_python/python/module.py; otherwise it'll return
the normal module. E.g.:
doctest = load_new_module('doctest', (2, 4))
"""
if python_version > sys.version_info:
if new_python_path not in sys.path:
sys.path.append(new_python_path)
try:
exec "import python.%s as generic_module" % module_name
except ImportError, e:
raise ImportError(
"Cannot load backported (from python version %s) "
"stdlib module %s; expected to find it in %s"
% ('.'.join(map(str, python_version)),
module_name,
os.path.join(new_python_path, 'python')))
else:
exec "import %s as generic_module" % module_name
return generic_module
def add_package(package_name):
"""
If package_name has not been installed, we add the appropriate
path from ../3rd-party/package_name-files
*After* calling this function you can import the package on your
own, either from the package the user installed, or from the
package we distribute.
"""
try:
exec "import %s" % package_name
except ImportError:
path = os.path.join(third_party, '%s-files' % package_name)
if os.path.exists(path):
sys.path.append(path)
else:
raise ImportError(
"Cannot load the package %s; expected to find it in "
"%s. Have you run build-pkg.py?"
% (package_name, path))
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