Enum class with ToString functionality

[bg_ie@yahoo.com]

Hi,

I have the following class -

class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2

plus the following code -

testResult = TestOutcomes.PA SSED

testResultAsStr ing
if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
else:
testResultAsStr ing = "Aborted"

But it would be much nicer if I had a function to covert to string as
part of the TestOutcomes class. How would I implement this?

Thanks,

Barry

[Duncan Booth]

Re: Enum class with ToString functionality

bg_ie@yahoo.com wrote:

But it would be much nicer if I had a function to covert to string as
part of the TestOutcomes class. How would I implement this?

Perhaps: http://aspn.activestate.com/ASPN/Coo.../Recipe/413486

[David]

Re: Enum class with ToString functionality

On 9/10/07, bg_ie@yahoo.com <bg_ie@yahoo.co mwrote:

Hi,
>
I have the following class -
>
class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2
>
plus the following code -
>
testResult = TestOutcomes.PA SSED
>
testResultAsStr ing
if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
else:
testResultAsStr ing = "Aborted"
>
But it would be much nicer if I had a function to covert to string as
part of the TestOutcomes class. How would I implement this?

You can use reflection to do this. Perhaps a constructor that goes
through your class dict (dir(self)) and builds an int->string mapping
property based on the value and name of the attributes (perhaps just
the ones whose type is int). To get the exact same result as your code
above you can capitalize the first letter of the attribute name, and
lowercase the rest.

[TheFlyingDutchman]

Re: Enum class with ToString functionality

On Sep 10, 2:28 am, bg...@yahoo.com wrote:

Hi,
>
I have the following class -
>
class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2
>
plus the following code -
>
testResult = TestOutcomes.PA SSED
>
testResultAsStr ing
if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
else:
testResultAsStr ing = "Aborted"
>
But it would be much nicer if I had a function to covert to string as
part of the TestOutcomes class. How would I implement this?
>
Thanks,
>
Barry

The equivalent to Java's toString() is __str__() in Python:

class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2

def __init__(self,o utcome):
self.outcome = outcome

def __str__(self):
if self.outcome == TestOutcomes.PA SSED:
return "Passed"
elif self.outcome == TestOutcomes.FA ILED :
return "Failed"
else:
return "Aborted"

if __name__ == "__main__":
testResult = TestOutcomes(Te stOutcomes.ABOR TED)
print testResult
testResult = TestOutcomes(Te stOutcomes.FAIL ED)
a = testResult.__st r__()
print a

Aborted
Failed

[aine_canby@yahoo.com]

Re: Enum class with ToString functionality

On 10 Sep, 13:35, TheFlyingDutchm an <zzbba...@aol.c omwrote:

On Sep 10, 2:28 am, bg...@yahoo.com wrote:
>
>
>
>
>

Hi,

>

I have the following class -

>

class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2

>

plus the following code -

>

testResult = TestOutcomes.PA SSED

>

testResultAsStr ing
if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
else:
testResultAsStr ing = "Aborted"

>

But it would be much nicer if I had a function to covert to string as
part of the TestOutcomes class. How would I implement this?

>

Thanks,

>

Barry

>
The equivalent to Java's toString() is __str__() in Python:
>
class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2
>
def __init__(self,o utcome):
self.outcome = outcome
>
def __str__(self):
if self.outcome == TestOutcomes.PA SSED:
return "Passed"
elif self.outcome == TestOutcomes.FA ILED :
return "Failed"
else:
return "Aborted"
>
if __name__ == "__main__":
testResult = TestOutcomes(Te stOutcomes.ABOR TED)
print testResult
testResult = TestOutcomes(Te stOutcomes.FAIL ED)
a = testResult.__st r__()
print a
>
Aborted
Failed- Dölj citerad text -
>
- Visa citerad text -

Would this be crazy? -

class TestOutcomes:
PASSED = "PASSED"
FAILED = "FAILED"
ABORTED = "ABORTED"

[TheFlyingDutchman]

Re: Enum class with ToString functionality

On Sep 10, 2:28 am, bg...@yahoo.com wrote:

Hi,
>
I have the following class -
>
class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2
>
plus the following code -
>
testResult = TestOutcomes.PA SSED
>
testResultAsStr ing
if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
else:
testResultAsStr ing = "Aborted"
>
But it would be much nicer if I had a function to covert to string as
part of the TestOutcomes class. How would I implement this?
>
Thanks,
>
Barry

class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2

def ToString(outcom e):
if outcome == TestOutcomes.PA SSED:
return "Passed"
elif outcome == TestOutcomes.FA ILED :
return "Failed"
else:
return "Aborted"

ToString = staticmethod(To String)

if __name__ == "__main__":
testResult = TestOutcomes.PA SSED
testResultAsStr ing = TestOutcomes.To String(testResu lt)
print testResultAsStr ing
print TestOutcomes.To String(testResu lt)


Passed
Passed

[Bjoern Schliessmann]

Re: Enum class with ToString functionality

bg_ie@yahoo.com wrote:

I have the following class -
>
class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2
>
plus the following code -
>
testResult = TestOutcomes.PA SSED
>
testResultAsStr ing
if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
else:
testResultAsStr ing = "Aborted"
>
But it would be much nicer if I had a function to covert to string
as part of the TestOutcomes class. How would I implement this?

Why don't use the simple approach like this?

TEST_PASSED = "Passed"
TEST_FAILED = "Failed"
TEST_ABORTED = "Aborted"

In Python, no one forces you to put everything in classes.

If you are determined to use the class approach, use the __str__
method. It's called when you do str(instance).

Regards,


Björn

--
BOFH excuse #122:

because Bill Gates is a Jehovah's witness and so nothing can work on
St. Swithin's day.

[Bruno Desthuilliers]

Re: Enum class with ToString functionality

TheFlyingDutchm an a écrit :

On Sep 10, 2:28 am, bg...@yahoo.com wrote:
>

>>Hi,
>>
>>I have the following class -
>>
>>class TestOutcomes:
> PASSED = 0
> FAILED = 1
> ABORTED = 2
>>
>>plus the following code -
>>
>>testResult = TestOutcomes.PA SSED
>>
>>testResultAsS tring
>>if testResult == TestOutcomes.PA SSED:
> testResultAsStr ing = "Passed"
>>elif testResult == TestOutcomes.FA ILED :
> testResultAsStr ing = "Failed"
>>else:
> testResultAsStr ing = "Aborted"
>>
>>But it would be much nicer if I had a function to covert to string as
>>part of the TestOutcomes class. How would I implement this?
>>
>>Thanks,
>>
>>Barry

>
>
class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2
>
def ToString(outcom e):
if outcome == TestOutcomes.PA SSED:
return "Passed"
elif outcome == TestOutcomes.FA ILED :
return "Failed"
else:
return "Aborted"
>
ToString = staticmethod(To String)
>
if __name__ == "__main__":
testResult = TestOutcomes.PA SSED
testResultAsStr ing = TestOutcomes.To String(testResu lt)
print testResultAsStr ing
print TestOutcomes.To String(testResu lt)
>

Technically correct, but totally unpythonic.

May I suggest some reading ?

http://dirtsimple.org/2004/12/python-is-not-java.html

[TheFlyingDutchman]

Re: Enum class with ToString functionality

On Sep 8, 9:52 am, Bruno Desthuilliers
<bdesth.quelque ch...@free.quel quepart.frwrote :

TheFlyingDutchm an a écrit :
>
>
>

On Sep 10, 2:28 am, bg...@yahoo.com wrote:

>

>Hi,

>

>I have the following class -

>

>class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2

>

>plus the following code -

>

>testResult = TestOutcomes.PA SSED

>

>testResultAsSt ring
>if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
>elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
>else:
testResultAsStr ing = "Aborted"

>

>But it would be much nicer if I had a function to covert to string as
>part of the TestOutcomes class. How would I implement this?

>

>Thanks,

>

>Barry

>

class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2

>

def ToString(outcom e):
if outcome == TestOutcomes.PA SSED:
return "Passed"
elif outcome == TestOutcomes.FA ILED :
return "Failed"
else:
return "Aborted"

>

ToString = staticmethod(To String)

>

if __name__ == "__main__":
testResult = TestOutcomes.PA SSED
testResultAsStr ing = TestOutcomes.To String(testResu lt)
print testResultAsStr ing
print TestOutcomes.To String(testResu lt)

>
Technically correct, but totally unpythonic.

Speaking of unpythonic, I would call

ToString = staticmethod(To String)

A Perlific syntax.

>
May I suggest some reading ?http://dirtsimple.org/2004/12/python-is-not-java.html

Well the Foo.Foo complaint is bogus:

from Foo import Foo

[Ben Finney]

Re: Enum class with ToString functionality

bg_ie@yahoo.com writes:

But it would be much nicer if I had a function to covert to string
as part of the TestOutcomes class. How would I implement this?

Others have given ad hoc implementations that may do what you want.

I'd like to know if the Cheeseshop package 'enum' is useful to
you. Any constructive feedback would be appreciated.

<URL:http://cheeseshop.pyth on.org/pypi/enum/>

--
\ "Remorse: Regret that one waited so long to do it." -- Henry |
`\ L. Mencken |
_o__) |
Ben Finney

[Bruno Desthuilliers]

Re: Enum class with ToString functionality

TheFlyingDutchm an a écrit :

On Sep 8, 9:52 am, Bruno Desthuilliers
<bdesth.quelque ch...@free.quel quepart.frwrote :
>

>>TheFlyingDutc hman a écrit :

(snip)

>>>class TestOutcomes:
>> PASSED = 0
>> FAILED = 1
>> ABORTED = 2

>>

>> def ToString(outcom e):
>> if outcome == TestOutcomes.PA SSED:
>> return "Passed"
>> elif outcome == TestOutcomes.FA ILED :
>> return "Failed"
>> else:
>> return "Aborted"

>>

>> ToString = staticmethod(To String)

>>

(snip)

>>Technically correct, but totally unpythonic.

>
>
Speaking of unpythonic, I would call
>
ToString = staticmethod(To String)
>
A Perlific syntax.

Nope, just a good ole HOF.

But nowadays, it's usually written this way:

@staticmethod
def some_static_met hod():
pass

>

>>May I suggest some reading ?http://dirtsimple.org/2004/12/python-is-not-java.html

>
Well the Foo.Foo complaint is bogus:
>
from Foo import Foo
>

Yes. And properties are bogus - just use getters and setters.

Seriously, writing Java in Python is definitively on the masochist side.
But if you like pain...

[Zara]

Re: Enum class with ToString functionality

On Mon, 10 Sep 2007 02:28:57 -0700, bg_ie@yahoo.com wrote:

>Hi,
>
>I have the following class -
>
>class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2
>
>plus the following code -
>
>testResult = TestOutcomes.PA SSED
>
>testResultAsSt ring
>if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
>elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
>else:
testResultAsStr ing = "Aborted"
>
>But it would be much nicer if I had a function to covert to string as
>part of the TestOutcomes class. How would I implement this?
>

You should implement __str__ (or __repr__) method in your class,

class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2

def __str__(self):
textResultAsStr ing="Unknown"
if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
else:
testResultAsStr ing = "Aborted"
return testResultAsStr ing

Regards,

Zara

[Ben Finney]

Version numbering (was: Enum class with ToString functionality)

TheFlyingDutchm an <zzbbaadd@aol.c omwrites:

On Sep 10, 7:55 pm, "J. Cliff Dyer" <j...@sdf.lones tar.orgwrote:

Uh... The 1.0 version is vaporware?

>
I think not. 42% of it is alive and kicking as we speak.

That's odd. Do you think some similar matchematical relationship
exists between Python version 2.4.4 and 3.0?

You've made the common error of reading a package version as though it
were a single number on a number line. That's not the customary
semantic, though: versions are interpreted as a tuple of distinct
integers.

When you were developing your Enum module, how did you determine you
were at the 0.4.2 version as opposed to the 0.7.1 version or the
0.9.2 version?

I initially developed at version 0.0, meaning "major level 0, minor
level 0" — i.e., no releases at all.

Then, when the first "alpha" release was ready, I called it version
0.1, meaning "major level 0, minor level 1" — i.e. no major releases
yet, but the first minor release.

Then, a small patch needed to be made, and the resulting release was
version 0.1.1, meaning "major level 0, minor level 1, patch level 1" —
i.e. the first patch to version 0.1.

Eventually some extra features warranted a release of version 0.2,
meaning "major level 0, minor level 2" — i.e. the second minor release
with still no major releases. Implicit in this is "patch level 0",
i.e. no patch-level versions yet; the version could be called 0.2.0
and have the same meaning.

Each dot-separated integer is interpreted as a distinct level,
subordinate to the preceding one:

* Two versions with different major numbers can be expected to be
incompatible.

* If two versions have the same major number, one can expect only
minor feature differences.

* If two versions have the same major and minor number, one can
expect that they differ only in bug fixes or the like.

* Subsequent integers would imply even smaller differences at that
same level if all preceding numbers were the same.

Within a level, subsequent integers imply subsequent release times:
version 0.4.1 can only be released before 0.4.2. However, this is not
true across levels: a hypothetical version 0.2.7 could be released
before *or* after 0.4.2, if the author decides a patch to the (equally
hypothetical) version 0.2.6 is warranted.

As for a putative version 1.0, that will not be released until I
determine the package is functionally complete and warrants a first
major release. Depending on how much changes between now and then, it
may have most, some, or none of the code you see presently in version
0.4.2.

--
\ "That's all very good in practice, but how does it work in |
`\ *theory*?" —Anonymous |
_o__) |
Ben Finney

[J. Cliff Dyer]

Re: Enum class with ToString functionality

Zara wrote:

On Mon, 10 Sep 2007 02:28:57 -0700, bg_ie@yahoo.com wrote:
>
>

>Hi,
>>
>I have the following class -
>>
>class TestOutcomes:
> PASSED = 0
> FAILED = 1
> ABORTED = 2
>>
>plus the following code -
>>
>testResult = TestOutcomes.PA SSED
>>
>testResultAsSt ring
>if testResult == TestOutcomes.PA SSED:
> testResultAsStr ing = "Passed"
>elif testResult == TestOutcomes.FA ILED :
> testResultAsStr ing = "Failed"
>else:
> testResultAsStr ing = "Aborted"
>>
>But it would be much nicer if I had a function to covert to string as
>part of the TestOutcomes class. How would I implement this?
>>
>>

You should implement __str__ (or __repr__) method in your class,
>
class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2
>
def __str__(self):
textResultAsStr ing="Unknown"
if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
else:
testResultAsStr ing = "Aborted"
return testResultAsStr ing
>
Regards,
>
Zara
>
>

This code cannot output "Unknown," because you use an else: at the end
of your if-chain to represent a specific (non-catch-all) case.

s/else:/elif testResult == TestOutcomes.AB ORTED:/

Cheers,
Cliff

[Scott David Daniels]

Re: Enum class with ToString functionality

bg_ie@yahoo.com wrote:

Hi,
>
I have the following class -
>
class TestOutcomes:
PASSED = 0
FAILED = 1
ABORTED = 2
>
plus the following code -
>
testResult = TestOutcomes.PA SSED
>
testResultAsStr ing
if testResult == TestOutcomes.PA SSED:
testResultAsStr ing = "Passed"
elif testResult == TestOutcomes.FA ILED :
testResultAsStr ing = "Failed"
else:
testResultAsStr ing = "Aborted"
>
But it would be much nicer if I had a function to covert to string as
part of the TestOutcomes class. How would I implement this?
>
Thanks,
>
Barry
>

class Outcome(object) :
PASSED, FAILED, ABORTED = range(3)

@classmethod
def named(class_, value):
for name in dir(class_):
if name[0] != '_' and getattr(class_, name) == value:
return name
raise ValueError('Unk nown value %r' % value)

Outcome.named(2 )


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