python-decorators

问题 Linked topic (but not duplicate): Decorator to time specific lines of the code instead of whole method? I know how decorators are usually used for Python functions. Is there a similar concept/syntax for single lines of code? Example: with def measuretime(lineofcode): start = time.time() lineofcode() print time.time() - start then @measuretime im = Image.open(BytesIO(base64.b64decode(data))) would be interpreted like start = time.time() im = Image.open(BytesIO(base64.b64decode(data))) print

问题 Linked topic (but not duplicate): Decorator to time specific lines of the code instead of whole method? I know how decorators are usually used for Python functions. Is there a similar concept/syntax for single lines of code? Example: with def measuretime(lineofcode): start = time.time() lineofcode() print time.time() - start then @measuretime im = Image.open(BytesIO(base64.b64decode(data))) would be interpreted like start = time.time() im = Image.open(BytesIO(base64.b64decode(data))) print

问题 I'm using a library function several times in my code which tests for a pass/fail condition and executes different code accordingly, but for some reason does not have a return value for the result it finds; I'd like to add this with a decorator so that I can call it in my code. What is the correct way to do this given that I cannot edit the source file? Should I do something like: def test_pass(param1, param2): external_function(param1, param2) if(...): return False else: return True Or is

问题 I'm using a library function several times in my code which tests for a pass/fail condition and executes different code accordingly, but for some reason does not have a return value for the result it finds; I'd like to add this with a decorator so that I can call it in my code. What is the correct way to do this given that I cannot edit the source file? Should I do something like: def test_pass(param1, param2): external_function(param1, param2) if(...): return False else: return True Or is

问题 i'm trying to create a simple program using python socket and threading library. I would like to automatize the following procedure using a decorator: t = threading.Thread(target=function, args=(arg1, arg2)) t.start() the program is structured using OOP so I defined a subclass inside the main one to contain all the decorators (I've read about this method in this article: https://medium.com/@vadimpushtaev/decorator-inside-python-class-1e74d23107f6). Therefore I have a situation like this:

问题 I'm trying to write a simple time decorator to measure time taken by functions. However the code below is giving our recursion error. What's wrong with it? import timeit def measure(func): def wrapper(): func_name = func.__name__ setup="from __main__ import {}".format(func_name) op_time = timeit.timeit('{}()'.format(func_name), number = 2, setup=setup) print(ot) return wrapper @measure def sample(): return 10 sample() Output RecursionError Traceback (most recent call last) <ipython-input-61

问题 I'm trying to write a simple time decorator to measure time taken by functions. However the code below is giving our recursion error. What's wrong with it? import timeit def measure(func): def wrapper(): func_name = func.__name__ setup="from __main__ import {}".format(func_name) op_time = timeit.timeit('{}()'.format(func_name), number = 2, setup=setup) print(ot) return wrapper @measure def sample(): return 10 sample() Output RecursionError Traceback (most recent call last) <ipython-input-61

问题 I'm trying to create a @synchronized wrapper that creates one Lock per object and makes method calls thread safe. I can only do this if I can access method.im_self of the method in the wrapped method. class B: def f(self): pass assert inspect.ismethod( B.f ) # OK assert inspect.ismethod( B().f ) # OK print B.f # <unbound method B.f> print B().f # <bound method B.f of <__main__.B instance at 0x7fa2055e67e8>> def synchronized(func): # func is not bound or unbound! print func # <function f at

问题 I'm trying to create a @synchronized wrapper that creates one Lock per object and makes method calls thread safe. I can only do this if I can access method.im_self of the method in the wrapped method. class B: def f(self): pass assert inspect.ismethod( B.f ) # OK assert inspect.ismethod( B().f ) # OK print B.f # <unbound method B.f> print B().f # <bound method B.f of <__main__.B instance at 0x7fa2055e67e8>> def synchronized(func): # func is not bound or unbound! print func # <function f at

问题 I'm trying to create a @synchronized wrapper that creates one Lock per object and makes method calls thread safe. I can only do this if I can access method.im_self of the method in the wrapped method. class B: def f(self): pass assert inspect.ismethod( B.f ) # OK assert inspect.ismethod( B().f ) # OK print B.f # <unbound method B.f> print B().f # <bound method B.f of <__main__.B instance at 0x7fa2055e67e8>> def synchronized(func): # func is not bound or unbound! print func # <function f at