hi folks, I've come up with a simple snippet that intends to explain the
concept of decorations without an article (for on app help), while being
succinct and concise, while not being overly complicated.
Does this work? I have another one coming for args, similar, if this
works... comments appreciated. thanks.
# BEGIN FUNCTION DECORATOR SIMPLE ################################
#
# define the function decorator (wrapper function)
def enter_exit(f):
def new_f():
print("entering", f.__name__)
f()
print(f.__name__, "exited !", end="\n\n")
return new_f
# the above "function decoration" takes a 'callable' as an argument
# and returns a 'callable' new function that is used to
# replace the original function (function is decorated), which
# adds functionality to the original function being decorated ...
# define the original function
def f1():
print(" inside f1()")
# replace the original function (above) with the new decorated
# 'wrapped' function using the function decoration 'enter_exit'...
f1 = enter_exit(f1)
# (OR) accomplish the same thing with decoration lines as below:
# functions wrapped with decoration lines syntax (annotations)
# as below, accomplish the same 'decoration' as above
# by using some 'syntactic sugar' to accomplish same ...
@enter_exit
def f2():
print(" inside f2()")
@enter_exit
def f3():
print(" inside f3()")
# demo the new 'decorated' functions
f1()
f2()
f3()
# END FUNCTION DECORATOR SIMPLE ##################################
--
https://mail.python.org/mailman/listinfo/python-list
