from functools import wraps
class default_kwargs(object):
"""
Metadecorator for ensuring specified keys are present in kwargs before calling function
Will only use default value if the key is not already present in kwargs.
"""
def __init__(self, **kwargs):
self.defaults = kwargs
def __call__(self, wrapped):
@wraps(wrapped)
def wrapper(*args, **kwargs):
new_kwargs = self.defaults.copy()
new_kwargs.update(kwargs)
return wrapped(*args, **new_kwargs)
return wrapper
## Usage example:
@default_kwargs(echo=True)
def f(*args, **kwargs):
if kwargs["echo"]:
print args, kwargs
Diff to Previous Revision
--- revision 1 2015-07-10 15:24:08
+++ revision 2 2015-07-10 15:25:04
@@ -16,3 +16,11 @@
new_kwargs.update(kwargs)
return wrapped(*args, **new_kwargs)
return wrapper
+
+
+## Usage example:
+
+@default_kwargs(echo=True)
+def f(*args, **kwargs):
+ if kwargs["echo"]:
+ print args, kwargs
