/Python/Examples of function decorators in Python

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

Source: book.pythontips.com

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

Source: book.pythontips.com

Similar codes

0 vote226 views1 answer
Outliers removal pandas
Python
0 vote189 views1 answer
Sort object by one attribute python
Python
2 votes192 views1 answer
Extract float from string python
Python
99 votes197 views6 answers
Python delete file
Python
0 vote264 views1 answer
Field 'id' expected a number but got <django.db.models.fields.related_descriptors.create_forward_many_to_many_manager.<locals>.ManyRelatedManager object at 0x7fb02044de80>
Python
6 votes193 views2 answers
Python gzip a file
Python
1 vote209 views2 answers
Round python print
Python
15 votes207 views3 answers
How to delete in python
Python
0 vote246 views1 answer
Flask migrate multiple heads
Python Flask
6 votes205 views2 answers
AttributeError: type object 'Callable' has no attribute '_abc_registry'
Python