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"""
'imports' a string -- converts a string to a Python object, importing
any necessary modules and evaluating the expression. Everything
before the : in an import expression is the module path; everything
after is an expression to be evaluated in the namespace of that
module.
Alternately, if no : is present, then import the modules and get the
attributes as necessary. Arbitrary expressions are not allowed in
that case.
"""
def eval_import(s):
if ':' not in s:
return simple_import(s)
module_name, expr = s.split(':', 1)
module = import_module(module_name)
obj = eval(expr, module.__dict__)
return obj
def simple_import(s):
parts = s.split('.')
module = import_module(parts[0])
name = parts[0]
parts = parts[1:]
while parts:
name += '.' + parts[0]
try:
module = import_module(name)
parts = parts[1:]
except ImportError:
break
obj = module
while parts:
obj = getattr(module, parts[0])
parts = parts[1:]
return obj
def import_module(s):
mod = __import__(s)
parts = s.split('.')
for part in parts[1:]:
mod = getattr(mod, part)
return mod
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