thank you very much @steve i guess it will make py fly more than ever !
Abdur-Rahmaan Janhangeer https://github.com/Abdur-rahmaanJ On Thu, 17 May 2018, 07:57 Steven D'Aprano, < steve+comp.lang.pyt...@pearwood.info> wrote: > On Thu, 17 May 2018 05:33:38 +0400, Abdur-Rahmaan Janhangeer wrote: > > > what does := proposes to do? > > Simply, it proposes to add a new operator := for assignment (or binding) > as an expression, as an addition to the = assignment operator which > operates only as a statement. The syntax is: > > name := expression > > and the meaning is: > > 1. evaluate <expression> > > 2. assign that value to <name> > > 3. return that same value as the result > > > A simple example (not necessarily a GOOD example, but a SIMPLE one): > > print(x := 100, x+1, x*2, x**3) > > will print: > > 100 101 200 1000000 > > Today, we would write that as: > > x = 100 > print(x, x+1, x*2, x**3) > > > A better example might be: > > > if mo := re.search(pattern1, text): > print(mo.group(0)) > elif mo := re.match(pattern2, text): > print(mo.group(3)) > elif mo := re.search(pattern3, text): > print(mo.group(2)) > > > > which today would need to be written as: > > > mo = re.search(pattern, text) > if mo: > print(mo.group(0)) > else: > mo = re.match(pattern2, text) > if mo: > print(mo.group(3)) > else: > mo := re.search(pattern3, text) > if mo: > print(mo.group(2)) > > > > -- > Steve > > -- > https://mail.python.org/mailman/listinfo/python-list > -- https://mail.python.org/mailman/listinfo/python-list
