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importstring.py
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importstring.py
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# encoding: utf-8
"""
A simple utility to import something by its string name.
Authors:
* Brian Granger
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2008-2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Functions and classes
#-----------------------------------------------------------------------------
def import_item(name):
"""Import and return bar given the string foo.bar."""
package = '.'.join(name.split('.')[0:-1])
obj = name.split('.')[-1]
# Note: the original code for this was the following. We've left it
# visible for now in case the new implementation shows any problems down
# the road, to make it easier on anyone looking for a problem. This code
# should be removed once we're comfortable we didn't break anything.
## execString = 'from %s import %s' % (package, obj)
## try:
## exec execString
## except SyntaxError:
## raise ImportError("Invalid class specification: %s" % name)
## exec 'temp = %s' % obj
## return temp
if package:
module = __import__(package,fromlist=[obj])
try:
pak = module.__dict__[obj]
except KeyError:
raise ImportError('No module named %s' % obj)
return pak
else:
return __import__(obj)