a gap of do....while?

[StarWing]

okay, I think somethings do....while is useful, but why python didn't
have it?

in lisp, we can (while (progn ....))
and in all other language we have do...while.
but in python, we only can:
cond = 1
while cond:
cond = 0
.....
if ....: cond = 1

has any polite way to handle this?

 

[Chris Rebert]

okay, I think somethings do....while is useful, but why python didn't
have it?

For simplicity of syntax and less duplication among the basic
syntactic constructs.

in lisp, we can (while (progn ....))
and in all other language we have do...while.
but in python, we only can:
cond = 1
while cond:
   cond = 0
   .....
   if ....: cond = 1

has any polite way to handle this?

It's essentially the same:

while True:
...
if not cond: break

This is considered idiomatic; and FWIW, I see do-while as having no
significant advantage over this.

Cheers,
Chris

 

[Chris Rebert]

It's essentially the same:

while True:
   ...
   if not cond: break

Substituting in the appropriate conditional expression for cond of
course (your use of cond for the flag caught me off guard).

Cheers,
Chris

 

[StarWing]

Substituting in the appropriate conditional expression for cond of
course (your use of cond for the flag caught me off guard).

Cheers,
Chris

Thank you, this is nice than mine

 

[Lie Ryan]

For simplicity of syntax and less duplication among the basic
syntactic constructs.

Less language features means less decisions to make.