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import warnings
def deprecated(func):
'''This is a decorator which can be used to mark functions
as deprecated. It will result in a warning being emitted
when the function is used.'''
def new_func(*args, **kwargs):
if not new_func.__called:
warnings.warn('Call to deprecated function "{0}".'.format(func.__name__),
stacklevel=2)
new_func.__called = True
return func(*args, **kwargs)
new_func.__name__ = func.__name__
new_func.__doc__ = func.__doc__
new_func.__dict__.update(func.__dict__)
new_func.__called = False
return new_func
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