Dear All,

I have just built revision 5775 on Windows, and the pyGraphMolWrap test fails.  
The relevant bit of the verbose output is below:

78: ERROR: testGithub498 (__main__.TestCase)
78: ----------------------------------------------------------------------
78: Traceback (most recent call last):
78:   File "C:/RDKit/Code/GraphMol/Wrap/rough_test.py", line 3033, in 
testGithub498
78:     outf = gzip.open(tempfile.mktemp(),'wt+')
78:   File "C:\Anaconda\lib\gzip.py", line 34, in open
78:     return GzipFile(filename, mode, compresslevel)
78:   File "C:\Anaconda\lib\gzip.py", line 94, in __init__
78:     fileobj = self.myfileobj = __builtin__.open(filename, mode or 'rb')
78: ValueError: Invalid mode ('wt+b')


This seems to be due to a difference in python/gzip behaviour on Windows vs. eg 
Linux:

On Ubuntu (Anaconda python):

In [1]: import tempfile, gzip
In [2]: outf = gzip.open(tempfile.mktemp(), 'wt+')
In [3]:


On Windows (again Anaconda python):

In [1]: import tempfile, gzip
In [2]: outf = gzip.open(tempfile.mktemp(), 'wt+')
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-2-6bee12287576> in <module>()
----> 1 outf = gzip.open(tempfile.mktemp(), 'wt+')

C:\Anaconda\lib\gzip.pyc in open(filename, mode, compresslevel)
     32
     33     """
---> 34     return GzipFile(filename, mode, compresslevel)
     35
     36 class GzipFile(io.BufferedIOBase):

C:\Anaconda\lib\gzip.pyc in __init__(self, filename, mode, compresslevel, 
fileobj, mtime)
     92             mode += 'b'
     93         if fileobj is None:
---> 94             fileobj = self.myfileobj = __builtin__.open(filename, mode 
or 'rb')
     95         if filename is None:
     96             # Issue #13781: os.fdopen() creates a fileobj with a bogus 
name

ValueError: Invalid mode ('wt+b')

In [3]:



Is this an easy one to fix?

Kind regards

James

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