rec2csv does not close filehandles passed in open

svn path=/trunk/matplotlib/; revision=4748

Author: astraw

CHANGELOG

@@ -1,3 +1,6 @@
+2007-12-16 rec2csv saves doubles without losing precision. Also, it
+           does not close filehandles passed in open. - JDH,ADS
+
 2007-12-13 Moved rec2gtk to matplotlib.toolkits.gtktools and rec2excel
            to matplotlib.toolkits.exceltools - JDH
 

lib/matplotlib/cbook.py

@@ -224,7 +224,7 @@ def is_numlike(obj):
     except TypeError: return False
     else: return True
 
-def to_filehandle(fname, flag='r'):
+def to_filehandle(fname, flag='r', return_opened=False):
     """
     fname can be a filename or a file handle.  Support for gzipped
     files is automatic, if the filename ends in .gz.  flag is a
@@ -236,10 +236,14 @@ def to_filehandle(fname, flag='r'):
             fh = gzip.open(fname, flag)
         else:
             fh = file(fname, flag)
+        opened = True
     elif hasattr(fname, 'seek'):
         fh = fname
+        opened = False
     else:
         raise ValueError('fname must be a string or file handle')
+    if return_opened:
+        return fh, opened
     return fh
 
 def flatten(seq, scalarp=is_scalar):

lib/matplotlib/mlab.py

@@ -2335,13 +2335,14 @@ def rec2csv(r, fname, delimiter=',', formatd=None):
     for i, name in enumerate(r.dtype.names):
         funcs.append(csvformat_factory(formatd[name]).tostr)
 
-    fh = cbook.to_filehandle(fname, 'w')
+    fh, opened = cbook.to_filehandle(fname, 'w', return_opened=True)
     writer = csv.writer(fh, delimiter=delimiter)
     header = r.dtype.names
     writer.writerow(header)
     for row in r:
         writer.writerow([func(val) for func, val in zip(funcs, row)])
-    fh.close()
+    if opened:
+        fh.close()