exceptions

[Zunbeltz Izaola]

Hi,

I've the following problem with try/exception.
I've a try block that will raise some exceptions.
I want the program to ignore this exceptions completely.
Is it possible?

Thanks in advance

Zunbeltz

--
Zunbeltz Izaola Azkona | wmbizazz at lg dot ehu
dotes
Materia Kondentsatuaren Fisika Saila |
Zientzia eta Teknologia Fakultatea | Phone: [phone]
Euskal Herriko Unibertsitatea |
PK 644 | Fax: [phone]
48080 Bilbo (SPAIN) |

[Peter Hansen]

Zunbeltz Izaola wrote:

I've the following problem with try/exception.
I've a try block that will raise some exceptions.
I want the program to ignore this exceptions completely.
Is it possible?

In the following, all exceptions will be ignored:

try:
# something that raises exceptions
except:
pass

This is definitely *not* a recommended way to write software,
however. You should really understand what you are doing before
writing code this way.

-Peter

[Brian Gough]

Zunbeltz Izaola <zu******@wm.lc .ehu.es.XXX> writes:

I've the following problem with try/exception.
I've a try block that will raise some exceptions.
I want the program to ignore this exceptions completely.
Is it possible?

You can use an empty "except:" to catch all exceptions and ignore them,

try:
# your code
except:
pass

See the Python tutorial or language reference manual for details.

--
Brian Gough

Network Theory Ltd,
Publishing the Python Manuals --- http://www.network-theory.co.uk/

[Zunbeltz Izaola]

Peter Hansen <pe***@engcorp. com> writes:

Zunbeltz Izaola wrote:

I've the following problem with try/exception.
I've a try block that will raise some exceptions.
I want the program to ignore this exceptions completely. Is it
possible?
In the following, all exceptions will be ignored:

try:
# something that raises exceptions
except:
pass

I've trid this, but the problem is that this finished the try block.
I want to continue executing the try block from the point the
exception was raised.
This is definitely *not* a recommended way to write software,
however. You should really understand what you are doing before
writing code this way.

I know. I need this feature for testing. I will desable it later.

Zunbeltz
-Peter

--
Zunbeltz Izaola Azkona | wmbizazz at lg dot ehu
dotes
Materia Kondentsatuaren Fisika Saila |
Zientzia eta Teknologia Fakultatea | Phone: [phone]
Euskal Herriko Unibertsitatea |
PK 644 | Fax: [phone]
48080 Bilbo (SPAIN) |

[Jeff Epler]

Use "pass" as the body of the "except:" block. For example:

def put(s, i, j):
"""Store j at s[i], or do nothing if s is not that long"""
try:
s[i] = j
except IndexError:
pass

l = [1, 2, 3]
put(l, 1, "hi")
put(l, 4, "bye")
l

[1, 'hi', 3]

Jeff

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[Peter Hansen]

Zunbeltz Izaola wrote:

Peter Hansen <pe***@engcorp. com> writes:

Zunbeltz Izaola wrote:

I've the following problem with try/exception.
I've a try block that will raise some exceptions.
I want the program to ignore this exceptions completely. Is it
possible?

In the following, all exceptions will be ignored:

try:
# something that raises exceptions
except:
pass

I've trid this, but the problem is that this finished the try block.
I want to continue executing the try block from the point the
exception was raised.

Not possible except, perhaps, with a significant amount of
working involving sys.settrace(). I think you need to find
another way to solve the problem.

What you are trying to do is not something that other people
who do unit testing seem to have to do. Why do you think
you need to actually *disable* exceptions entirely in order
to test this code? Perhaps the code needs to be restructured?

-Peter

[Zunbeltz Izaola]

Peter Hansen <pe***@engcorp. com> writes:

Zunbeltz Izaola wrote:

Peter Hansen <pe***@engcorp. com> writes:

Zunbeltz Izaola wrote:

I've the following problem with try/exception.
I've a try block that will raise some exceptions.
I want the program to ignore this exceptions completely. Is it
possible?

In the following, all exceptions will be ignored:

try:
# something that raises exceptions
except:
pass I've trid this, but the problem is that this finished the try block.
I want to continue executing the try block from the point the
exception was raised.

Not possible except, perhaps, with a significant amount of
working involving sys.settrace(). I think you need to find
another way to solve the problem.

What you are trying to do is not something that other people
who do unit testing seem to have to do. Why do you think
you need to actually *disable* exceptions entirely in order
to test this code? Perhaps the code needs to be restructured?

Possibly the code should be restructered, and re-designed; there is
always room for imporovement. But what I'm doing is not unittest. My
program is controling and instrument (an x-ray powder
diffractometer) and some parts of the instrument are not working for
the moment, so i want to disable all error i get from this instrument
(are coded like exceptions)

Zunbeltz
-Peter

--
Zunbeltz Izaola Azkona | wmbizazz at lg dot ehu
dotes
Materia Kondentsatuaren Fisika Saila |
Zientzia eta Teknologia Fakultatea | Phone: [phone]
Euskal Herriko Unibertsitatea |
PK 644 | Fax: [phone]
48080 Bilbo (SPAIN) |

[Irmen de Jong]

Zunbeltz Izaola wrote:

Possibly the code should be restructered, and re-designed; there is
always room for imporovement. But what I'm doing is not unittest. My
program is controling and instrument (an x-ray powder
diffractometer) and some parts of the instrument are not working for
the moment, so i want to disable all error i get from this instrument
(are coded like exceptions)

What I usually do in comparable situations is to write STUB code for
the parts of the system that don't work yet.
Write your stub code so that it does nothing, but doesn't raise any
exceptions too. The only thing you then have to do is write the rest
of the code as you would have done, and once the Stubbed parts work,
replace the stub code with the real code.

--Irmen

[Calvin Spealman]

Peter Hansen wrote:

Zunbeltz Izaola wrote:

I've trid this, but the problem is that this finished the try block.
I want to continue executing the try block from the point the
exception was raised.

Not possible except, perhaps, with a significant amount of
working involving sys.settrace(). I think you need to find
another way to solve the problem.

Have to admit tho, a continue feature might be useful. Some languages have
this, don't they? The thing is, Where exactly to continue? Should you retry
whatever raised the exception, continue just after it, at the beginning of
that line, or what?

[Scott David Daniels]

Calvin Spealman wrote:

...
Have to admit tho, a continue feature might be useful. Some languages have
this, don't they? The thing is, Where exactly to continue? Should you retry
whatever raised the exception, continue just after it, at the beginning of
that line, or what?

See this older thread:
<http://groups.google.c om/groups?threadm= 3edd6118%241%40 nntp0.pdx.net>

Xerox's experience (in deliberately removing the "continue from
exception" language feature) I found very instructive.

-Scott David Daniels
Sc***********@A cm.Org