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Next: 3.9 Built-in Module parser Up: 3.8 Built-in Module imp Previous: 3.8 Built-in Module imp

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3.8.1 Examples

The following function emulates the default import statement:

import imp
import sys
def __import__(name, globals=None, locals=None, fromlist=None):
 # Fast path: see if the module has already been imported.
 if sys.modules.has_key(name):
 return sys.modules[name]
 # If any of the following calls raises an exception,
 # there's a problem we can't handle -- let the caller handle it.
 # See if it's a built-in module.
 m = imp.init_builtin(name)
 if m:
 return m
 # See if it's a frozen module.
 m = imp.init_frozen(name)
 if m:
 return m
 # Search the default path (i.e. sys.path).
 fp, pathname, (suffix, mode, type) = imp.find_module(name)
 # See what we got.
 try:
 if type == imp.C_EXTENSION:
 return imp.load_dynamic(name, pathname)
 if type == imp.PY_SOURCE:
 return imp.load_source(name, pathname, fp)
 if type == imp.PY_COMPILED:
 return imp.load_compiled(name, pathname, fp)
 # Shouldn't get here at all.
 raise ImportError, '%s: unknown module type (%d)' % (name, type)
 finally:
 # Since we may exit via an exception, close fp explicitly.
 fp.close()

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guido@cnri.reston.va.us