examples of function decorators in Python
from functools import wraps def logit(func): @wraps(func) def with_logging(*args, **kwargs): print(func.__name__ + " was called") return func(*args, **kwargs) return with_logging @logit def addition_func(x): """Do some math.""" return x + x result = addition_func(4) # Output: addition_func was called
examples of function decorators in Python
from functools import wraps def logit(logfile='out.log'): def logging_decorator(func): @wraps(func) def wrapped_function(*args, **kwargs): log_string = func.__name__ + " was called" print(log_string) # Open the logfile and append with open(logfile, 'a') as opened_file: # Now we log to the specified logfile opened_file.write(log_string + '\n') return func(*args, **kwargs) return wrapped_function return logging_decorator @logit() def myfunc1(): pass myfunc1() # Output: myfunc1 was called # A file called out.log now exists, with the above string @logit(logfile='func2.log') def myfunc2(): pass myfunc2() # Output: myfunc2 was called # A file called func2.log now exists, with the above string
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