How to determine an object is "scriptable "

[abcd]

I recently came across a problem where I saw this error:
"TypeError: unsubscriptable object"

How can I determine if an object is "scriptable " or "unscriptab le"?

[Richard Brodie]

"abcd" <co*******@gmai l.com> wrote in message
news:11******** **************@ j33g2000cwa.goo glegroups.com.. .

I recently came across a problem where I saw this error:
"TypeError: unsubscriptable object"

How can I determine if an object is "scriptable " or "unscriptab le"?

subscriptable: supports an indexing operator, like a list does.

[abcd]

Richard Brodie wrote:

subscriptable: supports an indexing operator, like a list does.

doesn't seem to be a builtin function or module...or is that just your
definition of subscriptable?

[Larry Bates]

abcd wrote:

I recently came across a problem where I saw this error:
"TypeError: unsubscriptable object"

How can I determine if an object is "scriptable " or "unscriptab le"?

Simplest answer is to use isinstance to see if it is a string, list,
or tuple:

if isinstance(vari able, (str, list, tuple)):
..
..
..

Now the problem is that this answer doesn't address the problem.
Your code is attempting to do something to the wrong type of
object/variable which is a logic problem.

-Larry Bates

[Daniel Evers]

Richard Brodie wrote:

subscriptable: supports an indexing operator, like a list does.

Right. You can check this e.g. with

hasattr(x, "__getitem_ _")

because the __getitem__ method is used for indexing.

Daniel

[abcd]

Daniel Evers wrote:

Right. You can check this e.g. with

hasattr(x, "__getitem_ _")

because the __getitem__ method is used for indexing.

Thanks...that is what I was looking for!

[bruno at modulix]

Larry Bates wrote:

abcd wrote:

I recently came across a problem where I saw this error:
"TypeError: unsubscriptable object"

How can I determine if an object is "scriptable " or "unscriptab le"?

Simplest answer is to use isinstance to see if it is a string, list,
or tuple:

if isinstance(vari able, (str, list, tuple)):

Which will fail for a whole lot of objects that are scriptable...
Better use Daniel's solution or a try/except.

Now the problem is that this answer doesn't address the problem.
Your code is attempting to do something to the wrong type of
object/variable which is a logic problem.

Of course !-)

--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'o****@xiludom. gro'.split('@')])"

[Richard Brodie]

"abcd" <co*******@gmai l.com> wrote in message
news:11******** **************@ i39g2000cwa.goo glegroups.com.. .

doesn't seem to be a builtin function or module...or is that just your
definition of subscriptable?

Yes, I figured you were just confused. You were using the wrong words,
after all.

[bruno at modulix]

abcd wrote:

Richard Brodie wrote:

subscriptable : supports an indexing operator, like a list does.
doesn't seem to be a builtin function or module...

It's not. Look no further.
or is that just your
definition of subscriptable?

It's a correct definition of 'subscriptable' in the context of the
Python programming language - as well as a good exemple of an implied
interface.

--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'o****@xiludom. gro'.split('@')])"

[bruno at modulix]

abcd wrote:

I recently came across a problem where I saw this error:
"TypeError: unsubscriptable object"

How can I determine if an object is "scriptable " or "unscriptab le"?

By trying to apply the subscript operator ('[<index>]'). If it raises a
TypeError, then it's not subscriptable.

But, as Larry Bates already pointed out, your real problem is a logic
error: you get an unsubscriptable object where you assumed you had a
subscriptable one.

--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'o****@xiludom. gro'.split('@')])"