Python code for testing well parenthesized expression

[Diez B. Roggisch]

Jeremy Sanders wrote:

> candide wrote:
> 
>> I'm trying to implement in Python a function testing if an expression is
>> well parenthesized. For instance the expression "zx4er(1(er(Yy)ol)ol)ik"
>> is correctly parenthesized but this one "zx(4er(1(er(Yy)ol)ol)ik" is not.
>> 
>> My code follows at the end.
>> 
>> If you have a better algorithm or a better Python code (I'm a beginner in
>> the Python world), don't hesitate ...
> 
> Don't you want to just test that the number of "("s equals the number of
> ")"s or am I missing the point?

Yep, you are:

"())))((("

is certainly not "well parenthized".

Diez