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POWeird bug in python project
 

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  1. POWeird bug in python project
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    <p>I'm working on a big project in Python, and I've run into a bizarre error I can't explain. In one of my classes, I have a private method being called during instantiation:</p> <pre><code>def _convertIndex(self, dimInd, dimName): '''Private function that converts numbers to numbers and non-integers using the subclass\'s convertIndex.''' print dimInd, ' is dimInd' try: return int(dimName) except: if dimName == '*': return 0 else: print self.param.sets, ' is self.param.sets' print type(self.param.sets), ' is the type of self.param.sets' print self.param.sets[dimInd], ' is the param at dimind' return self.param.sets[dimInd].value(dimName) </code></pre> <p>What it's printing out:</p> <pre><code>0 is dimInd [&lt;coremcs.SymbolicSet.SymbolicSet object at 0x10618ad90&gt;] is self.param.sets &lt;type 'list'&gt; is the type of self.param.sets &lt;SymbolicSet BAZ=['baz1', 'baz2', 'baz3', 'baz4']&gt; is the param at dimind ====================================================================== ERROR: testParameterSet (GtapTest.TestGtapParameter) ---------------------------------------------------------------------- Traceback (most recent call last): File "/Users/myuser/Documents/workspace/ilucmc/gtapmcs/test/GtapTest.py", line 116, in testParameterSet pset = ParameterSet(prmFile, dstFile, GtapParameter) File "/Users/myuser/Documents/workspace/ilucmc/coremcs/ParameterSet.py", line 103, in __init__ self.distroDict, corrDefs = AbsBaseDistro.readFile(distFile, self.paramDict) File "/Users/myuser/Documents/workspace/ilucmc/coremcs/Distro.py", line 359, in readFile distro = cls.parseDistro(param, target, distroType, args) File "/Users/myuser/Documents/workspace/ilucmc/coremcs/Distro.py", line 301, in parseDistro return cls(param, target, distro, dim_names, argDict) File "/Users/myuser/Documents/workspace/ilucmc/coremcs/Distro.py", line 150, in __init__ self.dim_indxs = list(starmap(self._convertIndex, enumerate(dim_names))) # convert to numeric values and save in dim_indxs File "/Users/myuser/Documents/workspace/ilucmc/coremcs/Distro.py", line 194, in _convertIndex print self.param.sets[dimInd], ' is the param at dimind' IndexError: list index out of range </code></pre> <p>Obviously this isn't the code for the whole class, but it represents something that I don't understand. The error is coming when I index into self.param.sets. Apparently, dimInd is out of range. the problem is, dimInd is 0, and self.param.sets is a list of length 1 (as shown from the print statements), so why can't I index into it? </p> <p>EDIT: For what it's worth, the <code>__init__</code> method looks like this:</p> <pre><code>''' Stores a definitions of a distribution to be applied to a header variable. See the file setup/gtap/DistroDoc.txt for the details. ''' def __init__(self, param, target, distType, dim_names, argDict): self.name = param.name self.dim_names = dim_names self.dim_indxs = [] self.target = target.lower() if target else None self.distType = distType.lower() if distType else None self.rv = None self.argDict = {} self.modifier = defaultdict(lambda: None) self.param = param # Separate args into modifiers and distribution arguments for k, v in argDict.iteritems(): if k[0] == '_': # modifiers start with underscore self.modifier[k] = v else: self.argDict[k] = v # distribution arguments do not have underscore if self.target == 'index': print dim_names self.dim_indxs = list(starmap(self._convertIndex, enumerate(dim_names))) # convert to numeric values and save in dim_indxs if distType == 'discrete': entries = self.modifier['_entries'] if not entries: raise DistributionSpecError("Not enough arguments given to discrete distribution.") modDict = {k[1:]: float(v) for k, v in self.modifier.iteritems() if k[1:] in getOptionalArgs(DiscreteDist.__init__)} self.rv = DiscreteDist(entries, **modDict) return sig = DistroGen.signature(distType, self.argDict.keys()) gen = DistroGen.generator(sig) if gen is None: raise DistributionSpecError("Unknown distribution signature %s" % str(sig)) self.rv = gen.makeRV(self.argDict) # generate a frozen RV with the specified arguments self.isFactor = gen.isFactor </code></pre>
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    1. PTQuestion
    1. USsfendell
    1. USsfendell
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    1. COYou'll have to show at least the `__init__` code to know what's going on.
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      1. POWeird bug in python project
      1. USNed Batchelder
    2. COThe reason that I didn't show the __init__ code is that there's a bunch of irrelevant stuff in there that I think confuses the issue. The point is that __init__ calls this method with the arguments 0 and 'baz1', for dimInd and dimName respectively. The code throws an error on the last print statement, but still manages to print it out. Does that make a little more sense? I'd really like to avoid putting the whole massive class in here. I could put some print statements in _convertIndex to show that it's really getting the arguments I think it is.
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      1. POWeird bug in python project
      1. USsfendell
    3. COCouldn't it be executing the print statements and throwing the error in different tests? I can't see any other reason.
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      1. POWeird bug in python project
      1. USA. Rodas
 

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