How to List Imported Modules in Python: Comprehensive vs. Current Module?

How to Enumerate Imported Modules in Python

Enlisting the modules imported into a given Python script or interactive session can be useful for introspection or debugging purposes. To achieve this, we can leverage Python's sys module.

Consider the following code snippet:

<code class="python">import os
import sys</code>

We can list the imported modules using:

<code class="python">import sys
sys.modules.keys()</code>

Output:

['os', 'sys']

This approach provides a comprehensive list of all imported modules, including those imported in the main module as well as any modules imported within modules or functions.

Approximating Module Imports for the Current Module

In scenarios where it's desirable to inspect imported modules only within the current module, we can utilize the globals() function and inspect it for module types. This method provides an approximation of the current module's imports.

<code class="python">import types
def imports():
    for name, val in globals().items():
        if isinstance(val, types.ModuleType):
            yield val.__name__</code>

However, it's worth noting that this technique excludes local imports and imports involving non-module objects (e.g., from x import y). Additionally, it yields val.__name__ for module names. If you need to retrieve the alias instead, replace yield val.__name__ with yield name.

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