fix comments

Author: wkliao

examples/get_vara.py

@@ -95,8 +95,8 @@ def pnetcdf_io(filename, file_format):
     if rank == 0 and verbose:
         print("variable attribute \"str_att_name\" of type text =", str_att)
 
-    # Get the length of the variable's attribute named "float_att_name"
-    float_att =  v.get_att("float_att_name")
+    # Get the variable's attribute named "float_att_name"
+    float_att = v.get_att("float_att_name")
 
     # set access pattern for reading subarray
     local_ny = global_ny

src/pnetcdf/_File.pyx

@@ -499,12 +499,11 @@ cdef class File:
 
         Operational mode: This method must be called while the file is in define mode.
         """
-
-
         cdef nc_type xtype
         xtype=-99
         _set_att(self, NC_GLOBAL, name, value, xtype=xtype)
 
+
     def get_att(self,name,encoding='utf-8'):
         """
         get_att(self,name,encoding='utf-8')
@@ -519,14 +518,14 @@ cdef class File:
         :param name: Name of the attribute.
         :type name: str
 
-        :rtype: str
+        :rtype: str or numpy.ndarray
 
-        Operational mode: This method must be called while the file is in define mode.
+        Operational mode: This method can be called while the file is in either
+            define or data mode (collective or independent).
         """
-
-
         return _get_att(self, NC_GLOBAL, name, encoding=encoding)
 
+
     def __delattr__(self,name):
         # if it's a netCDF attribute, remove it
         if name not in _private_atts:

src/pnetcdf/_utils.pyx

@@ -296,7 +296,7 @@ cdef _get_att(file, int varid, name, encoding='utf-8'):
 
 
 cdef _get_att_names(int file_id, int varid):
-    # Private function to get all the attribute names in a group
+    # Private function to get all the attribute names of a variable
     cdef int ierr, numatts, n
     cdef char namstring[NC_MAX_NAME+1]
     if varid == NC_GLOBAL: