win32com Excel bug?

[cfriedalek]

I'm driving Excel from python, largely successfully. Now I'm trying to
add errorbars to XY scatter plots. Keep getting a com_error. Can't
track down the problem.

I modified a simple example to duplicate the problem. Thanks to Mathieu
Fenniak http://www.stompstompstomp.com/weblog/entries/67/ for the code.

The traceback is shown below. You can see that the Excel chart series
has a method called ErrorBar. But when I try to use it with any or all
of its allowed arguments, it fails. The traceback goes into the guts of
win32com but I don't really have a clue at that point. (Happy to learn
something new though).

The relevant Excel VBA language doc is here.
http://msdn.microsoft.com/library/de...HV03076818.asp

Hope someone can help. Losing hair .... fast!

In [16]: %run test.py
--Return--

c:\python23\lib\pdb.py(992)set_trace()->None -> Pdb().set_trace()
(Pdb) c
There's a method waiting
---------------------------------------------------------------------------
pywintypes.com_error Traceback (most
recent call
last)

c:\temp\mpival\test.py
79
80 # A simple example:
---> 81 plot( (1,2,3,4,5), (6,7,8,9,10) )
82
83 # Some more data:

c:\temp\mpival\test.py in plot(x, y, xAxisLog, yAxisLog)
35 if series.ErrorBar:
36 print "There's a method waiting"
---> 37 series.ErrorBar(Direction = constants.xlY)
38
39

C:\Python23\lib\site-packages\win32com\gen_py\00020813-0000-0000-C000-0000000000
46x0x1x4.py in ErrorBar(self, Direction, Include, Type, Amount,
MinusValues)
22722 , MinusValues=defaultNamedOptArg):
22723 return self._ApplyTypes_(152, 1, (12, 0), ((3,
1), (3, 1
), (3, 1), (12, 17), (12, 17)), 'ErrorBar', None,Direction 22724 , Include, Type, Amount, MinusValues)

22725
22726 def Paste(self):

C:\Python23\lib\site-packages\win32com\client\__init__.py in
_ApplyTypes_(self,
dispid, wFlags, retType, argTypes, user, resultCLSID, *args)
444 def _ApplyTypes_(self, dispid, wFlags, retType,
argTypes, user,
445 resultCLSID, *args):
--> 446 return self._get_good_object_(
447 self._oleobj_.InvokeTypes(
448 dispid, 0, wFlags, retType,
argTypes, *arg
s),

com_error: (-2147352567, 'Exception occurred.', (0, 'Microsoft Excel',
'ErrorBar
method of Series class failed', 'C:\\Program Files (x86)\\Microsoft
Office\\Off
ice10\\1033\\xlmain10.chm', 0, -2146827284), None)
WARNING: Failure executing file: <test.py>

[Roger Upole]

<cf********@gmail.com> wrote in message news:11**********************@g10g2000cwb.googlegr oups.com...

I'm driving Excel from python, largely successfully. Now I'm trying to
add errorbars to XY scatter plots. Keep getting a com_error. Can't
track down the problem.

I modified a simple example to duplicate the problem. Thanks to Mathieu
Fenniak http://www.stompstompstomp.com/weblog/entries/67/ for the code.

The traceback is shown below. You can see that the Excel chart series
has a method called ErrorBar. But when I try to use it with any or all
of its allowed arguments, it fails. The traceback goes into the guts of
win32com but I don't really have a clue at that point. (Happy to learn
something new though).

The relevant Excel VBA language doc is here.
http://msdn.microsoft.com/library/de...HV03076818.asp

Hope someone can help. Losing hair .... fast!

In [16]: %run test.py
--Return--

c:\python23\lib\pdb.py(992)set_trace()->None

-> Pdb().set_trace()
(Pdb) c
There's a method waiting
---------------------------------------------------------------------------
pywintypes.com_error Traceback (most
recent call
last)

c:\temp\mpival\test.py
79
80 # A simple example:
---> 81 plot( (1,2,3,4,5), (6,7,8,9,10) )
82
83 # Some more data:

c:\temp\mpival\test.py in plot(x, y, xAxisLog, yAxisLog)
35 if series.ErrorBar:
36 print "There's a method waiting"
---> 37 series.ErrorBar(Direction = constants.xlY)

According to the docs, the Include and Type arguments are
required, and they're not being passed to the method.

hth
Roger

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[cfriedalek]

yth (Yes That Helped).

You know how it goes, I thought I'd already tried to include all
arguments. Obviously I didn't, or stuffed it up in some other way.
Also some confusion about the meaning of "required" and "default". The
doc explains these arguments as required, but some have defaults. I
guess I thought if they had defaults then they didn't need to be
specified.

Anyway, problem solved. Thanks again.