Hi, I'm new to the group and to Python, so forgive me if I make any faux-pas
here. As I can tell, the only way to pass a function as an argument is to
reference its name as follows:
def foo1(message):
print(message)
def foo2(foo, message):
print("Your function says:")
foo(message)
>>foo2(foo1, "Hello World!")
Your function says:
Hello World!
This is how it is at the moment, however it may be more agreeable, especially
if that is the only purpose of the function, for python users to be able to
define new functions inside of function calls. The way I propose this may occur
is using similar syntax as control structures, as exampled below:
def foo2(foo):
print("Message to print:", end = " ")
foo()
>>foo2():
....print("Hello World!")
Message to print: Hello World!
In this proposal, it should be noted, that unlike control structures, the
brackets are required for the function call. The "suite" or "annex" is defined
as a function object by the compiler and passed inside the call. Here are some
other examples of the proposal.
*Non-Function Arguments with Annexed Functions*
Non-Function Arguments should be placed in the brackets before annexed
functions, and this should be reflected in the parameter order. If they are
not, they won't be assigned to, which would cause an error unless a default
value is given. These parameters could be available for passing in the annexed
function if mentioned when the paramaeter is called.
def myFoo (num1, num2, foo):
return foo (num1, num2)
>>myFoo(20, 30):
....return num1 + num2
50
*Annexing Multiple Functions or Out of Order Annex*
To specify the order in which functions are annexed, or annex multiple
functions, one could use the parameter name before the specific suite.
class Book:
def __init__(self, name, author):
self.name = name
self.author = author
def doToBooks (bookList, first, then, book = None):
for book in bookList
first(book = book)
then(book = book)
myBooks = [
Book("The Way of the World", "Lucy Cole"),
Book("To Live or To Love", "Georgio Dunham"),
Book("Twelve Days of Success", "Anita Duvette")
]
doToBooks (myBooks):
print(book.name)
then:
print(" - " + book.author + "\n")
>
The Way of The World
- Lucy Cole
To Live or To Die
- Georgio Dunham
Twelve Days of Success
- Anita Duvette
This proposal does not detract from the core appearance and appeal of Python
while creating an option for users and module makers who want themselves or the
users of their modules not to have to previously define functions in order to
use the code. This would make such code more aesthetic and compact, and take
away the need for defining a new function, name and all, specifically for such
which ultimately would be used only once as an argument.
--
https://mail.python.org/mailman/listinfo/python-list
