Modul

/moˈduːl/

Control the exported members for your modules

Requirements

Modul requires Python >=3.7

Installation

$ python -m pip install modul

Modul is a single-file module with less than 200 lines of code and no dependencies. It can be easily copied into your project.

Quick start

Write a module exporting limited members:

# mymodule.py
from modul import exports


@exports
def foo():
    return 42


baz = "unexported"
bar = "hello"

exports.bar = bar

In another module or REPL:

>>> import mymodule
>>> mymodule.foo()
42
>>> mymodule.bar
"hello"
>>> mymodule.baz
AttributeError: Module test has no attribute baz
>>> mymodule.__all__
['foo', 'bar']

Usage

1. Export a function with decorator:

   @exports
   def foo():
       return 42

2. Export a variable with attribute set:

   exports.bar = 42

   Note that to use the variable inside the module, you still need to declare a variable for it:

   bar = 42
   exports.bar = bar

3. Export a variable with item set:

   exports["bar"] = 42

   Besides, the exports object supports all APIs of dict:

   exports.update({"bar": 42})

4. Export a map of (name, value) pairs:

   exports({
       "bar": 42,
       "baz": "hello"
   })

5. You can even have conditional exports and exports from function call:

   flag = True
   if flag:
       exports.foo = 42
   
   def export_bar():
       exports.bar = 42
   export_bar()

6. Alternatively, you can assign members to the exports attribute of the module:

   import modul
   
   modul.exports = {
       "bar": 42,
       "baz": "hello"
   }

   Note that you can't use exports = <variable> in this case, because it will lose the reference to the API. And each assignment will overwrite the previous one so there can be only one assignment in your module.