libb.replaceattr

replaceattr(obj, attrname, newval)

Context manager for temporarily monkey patching an object attribute.

Parameters:

• obj – Object to patch.

• attrname (str) – Attribute name to temporarily replace.

• newval – Temporary value to set.

Basic Usage:

>>> class Foo: pass
>>> f = Foo()
>>> f.x = 13
>>> with replaceattr(f, 'x', 'pho'):
...     f.x
'pho'
>>> f.x
13

If the obj did not have the attr set, we remove it:

>>> with replaceattr(f, 'y', 'boo'):
...     f.y=='boo'
True
>>> hasattr(f, 'y')
False