Determine, is module name already defined, without loading module [duplicate]

Question

I want to allow user to make module file, if name isn't defined in Py3k already. (In it's portable installation). For ex, if user enters "ppp" i must check first, if module "ppp" exists in Py installation (it exists here!) and disallow this name. If he enters "my_name" i must allow it and if enters "ppp" or "json" I must disallow it.

Any way doing this check without doing "import" first? such import may take much memory. I only want to check if module name can be imported.

Tom Leese · Accepted Answer · 2013-12-21 21:22:37Z

1

You can use the pkgutil module, something like this:

import pkgutil

def module_exists(m):
    for module_loader, name, ispkg in pkgutil.iter_modules():
        if name == m:
            return True
    return False

answered Dec 21, 2013 at 21:22

Tom Leese

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