Apply a single decorator to multiple functions

Question

I’ve searched for this, but the results I’ve seen involve the opposite: applying multiple decorators to a single function.

I’d like to simplify this pattern. Is there a way to apply this single decorator to multiple functions? If not, how can I rewrite the above to be less repetitious?

from mock import patch

@patch('somelongmodulename.somelongmodulefunction')
def test_a(patched):
    pass  # test one behavior using the above function

@patch('somelongmodulename.somelongmodulefunction')
def test_b(patched):
    pass  # test another behavior

@patch('somelongmodulename.somelongmodulefunction')
def test_c(patched):
    pass  # test a third behavior

from mock import patch

patched_name = 'somelongmodulename.somelongmodulefunction'

@patch(patched_name)
def test_a(patched):
    pass  # test one behavior using the above function

@patch(patched_name)
def test_b(patched):
    pass  # test another behavior

@patch(patched_name)
def test_c(patched):
    pass  # test a third behavior

Asked By: caleb531

||

Source

Answer 1

If you want to make the “long” function call only once and decorate all three functions with the result, just do exactly that.

my_patch = patch('somelongmodulename.somelongmodulefunction')

@my_patch
def test_a(patched):
    pass

@my_patch
def test_b(patched):
    pass

Answered By: davidism

Answer 2

If you want to get fancy, you can modify globals(). The general idea below should work.

test_pattern = re.compile(r'test_w+')
test_names = [name for name in globals().keys() if test_pattern.match(name)]
for name in test_names:
  globals()[name] = decorate(globals()[name])

Answered By: justhecuke

Answer 3

To add on what justhecuke said about using globals(), in case the function is located in a different module, you could do something like this:

import inspect

def decorator_func(func):
    def inner():
        print("Decorated")
        func()
    return inner

moduleA = __import__('moduleA')
for name, obj in inspect.getmembers(moduleA):
    if name.startswith('test_') and inspect.isfunction(obj): #Conditions to apply decorators on expected functions
          moduleA.__dict__[name] = decorator_func(moduleA.__dict__[name])

Answered By: Luciano P.

Apply a single decorator to multiple functions

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