Python Import Submodules By String Names?

How can I use a list of strings ( names of submodules) to import submodules in current module ? Current code: from mainapp.utils import firstutil from mainapp.utils import secondut

Solution 1:

defgetobj(astr):
    """
    getobj('scipy.stats.stats') returns the associated module
    getobj('scipy.stats.stats.chisquare') returns the associated function
    """try:
        returnglobals()[astr]
    except KeyError:
        try:
            return__import__(astr, fromlist=[''])
        except ImportError:
            modname, _, basename = astr.rpartition('.')
            if modname:
                mod = getobj(modname)
                returngetattr(mod, basename)
            else:
                raise

needed_utils = ["firstutil", "secondutil", "fifthutil"]
for util_name in needed_utils:
    globals()[util_name] = getobj('mainapp.utils.{m}'.format(m=util_name))

Solution 2:

The thing that's confusing about the __import__ function is that you need to pass the fromlist argument to do what you want:

mod1 = __import__('foo.bar')  # returns the "foo" modulemod2 = __import__('foo.bar', fromlist=['thing_in_module'])  # returns the "bar" module

As C.B. notes in a comment, a more full explanation can be found at Python's __import__ doesn't work as expected