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python decorators

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Innocent Iguana answered on September 30, 2020 Popularity 9/10 Helpfulness 4/10

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### Decorators: Decorators are nothing but nested functions, where the parent function 
### takes only a function as input and the child function modifies the behavior of input function
import time
from functools import wraps
def decorator(func):
    """A decorator that prints how long a function took to run."""
    # Use @wraps to bind function's meta data like docstring / function name etc
    @wraps(func)
    # Define the wrapper function to return.
    def changed_func(*args, **kwargs):
        t_start = time.time()
        # Call the decorated function and store the result.
        result = func(*args, **kwargs)
        t_total = time.time() - t_start
        print('{} took {}s'.format(func.__name__, t_total))
        return result
    return changed_func

@decorator
def sleep_n_seconds(n):
    time.sleep(n)

sleep_n_seconds(5) # 5.00001

########################
### Decorator Factory: An outermost function that wraps around a decorator and takes argument for 
### the decorator since the decorator itself cannot take any argument other than a single function

from functools import wraps
# an outer function that takes argument
def decorator_factory(n):
    """Define and return a decorator"""
    def decorator(func):
        @wraps(func)
        def changed_func(*args, **kwargs):
            for i in range(n):
                func(*args, **kwargs)
        return changed_func
    return decorator

run_three_times = decorator_factory(3)
@run_three_times
def print_sum(a, b):
    print(a + b)

@decorator_factory(3)
def print_sum(a, b):
    print(a + b)

Popularity 9/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: python python-decorators

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Contributed on Dec 07 2023

Innocent Iguana

0 Answers Avg Quality 2/10

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decorator python

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def our_decorator(func):
    def function_wrapper(x):
        print("Before calling " + func.__name__)
        func(x)
        print("After calling " + func.__name__)
    return function_wrapper

@our_decorator
def foo(x):
    print("Hi, foo has been called with " + str(x))

foo("Hi")

Popularity 10/10 Helpfulness 5/10 Language python

Source: www.python-course.eu

Tags: decorator deco

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Contributed on Sep 30 2020

Busy Batfish

0 Answers Avg Quality 2/10

python decorator

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def uppercase_decorator(func):
    def function_wrapper(x):
        print("Before calling " + func.__name__)
        # function that is decorated making name parameter always uppercase
        func(x.upper())
        print("After calling " + func.__name__)
    return function_wrapper

@uppercase_decorator
def user(name):
    print(f"Hi, {name}")

user("Sam")

# output
# Before calling user
# Hi, SAM
# After calling user

Popularity 10/10 Helpfulness 4/10 Language python

Source: codefreelance.net

Tags: decorator deco

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Contributed on Sep 01 2022

Jerome Scott

0 Answers Avg Quality 2/10

python decorator

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from functools import wraps
def debug(func):
    @wraps(func)
    def out(*args, **kwargs):
        print('hello world')
        return func(*args, **kwargs)
    return out

@debug
def add(x, y):
    return x + y

Popularity 10/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: decorator deco

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Contributed on Nov 16 2021

Thom626

0 Answers Avg Quality 2/10

python decorator

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# Decorator with arguments
import functools

# First function takes the wanted number of repetition
def repeat(num_times):
    # Second function takes the function
    def decorator_repeat(func):
        # Third function, the wrapper executes the function the number of times wanted        
        # functools decorator to print the true name of the function passed instead of "wrapper"
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            for _ in range(num_times):
                result= func(*args, **kwargs)
            return result
        return wrapper
    return decorator_repeat

# Our function using the decorator
@repeat(num_times= 3)
def greet(name):
    print(f"Hello {name}")

greet("thomas")

Popularity 10/10 Helpfulness 3/10 Language python

Source: Grepper

Tags: decorator deco

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Contributed on Oct 06 2020

Frantic Frog

0 Answers Avg Quality 2/10

decorators in python

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def deco(function):
    def wrap(num):
        if num % 2 == 0:
            print(num,"is even ")
        else:
            print(num,"is odd")
        function(num)
    return wrap
    
@deco
def display(num):
    return num
display(9)   # pass any number to check whether number is even or odd

Popularity 10/10 Helpfulness 3/10 Language python

Source: Grepper

Tags: python py

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Contributed on Jun 25 2021

King Generous

0 Answers Avg Quality 2/10

decorators in python

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# this functon converts any string into uppercase
def deco(function):
    def wrap(s):
        return s.upper()
        function(s)
    return wrap

@deco
def display(s):
    return s 
print(display("not bad"))

Popularity 10/10 Helpfulness 3/10 Language python

Source: Grepper

Tags: python py

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Contributed on Jun 25 2021

King Generous

0 Answers Avg Quality 2/10

understanding decorator python 1

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def a_new_decorator(a_func):

    def wrapTheFunction():
        print("I am doing some boring work before executing a_func()")

        a_func()

        print("I am doing some boring work after executing a_func()")

    return wrapTheFunction

def a_function_requiring_decoration():
    print("I am the function which needs some decoration to remove my foul smell")

a_function_requiring_decoration()
#outputs: "I am the function which needs some decoration to remove my foul smell"

a_function_requiring_decoration = a_new_decorator(a_function_requiring_decoration)
#now a_function_requiring_decoration is wrapped by wrapTheFunction()

a_function_requiring_decoration()
#outputs:I am doing some boring work before executing a_func()
#        I am the function which needs some decoration to remove my foul smell
#        I am doing some boring work after executing a_func()

Popularity 9/10 Helpfulness 2/10 Language python

Source: book.pythontips.com

Tags: decorator deco

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Contributed on Nov 30 2022

Marc Yeranosyan

0 Answers Avg Quality 2/10

python decorators

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>>> from functools import wraps
>>> def my_decorator(f):
...     @wraps(f)
...     def wrapper(*args, **kwds):
...         print('Calling decorated function')
...         return f(*args, **kwds)
...     return wrapper
...
>>> @my_decorator
... def example():
...     """Docstring"""
...     print('Called example function')
...
>>> example()
Calling decorated function
Called example function
>>> example.__name__
'example'
>>> example.__doc__
'Docstring'

Popularity 9/10 Helpfulness 2/10 Language python

Source: docs.python.org

Tags: python py

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Contributed on Jul 19 2023

Nice Narwhal

0 Answers Avg Quality 2/10

Decorators in python

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# decorator function to convert to lowercase
def lowercase_decorator(function):
   def wrapper():
       func = function()
       string_lowercase = func.lower()
       return string_lowercase
   return wrapper
# decorator function to split words
def splitter_decorator(function):
   def wrapper():
       func = function()
       string_split = func.split()
       return string_split
   return wrapper
@splitter_decorator # this is executed next
@lowercase_decorator # this is executed first
def hello():
   return 'Hello World'
hello()   # output => [ 'hello' , 'world' ]

Popularity 10/10 Helpfulness 2/10 Language python

Source: www.interviewbit.com

Tags: python py

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Contributed on May 30 2022

Rakesh Meher

0 Answers Avg Quality 2/10

python decorators

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