fix #3: more descriptive exception text when iostream instance does n…

…ot match
pyexcel · Sep 8, 2015 · 8408f79 · 8408f79
1 parent 901e899
commit 8408f79
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/pyexcel_io/__init__.py b/pyexcel_io/__init__.py
@@ -28,6 +28,7 @@
     MESSAGE_LOADING_FORMATTER,
     MESSAGE_ERROR_02,
     MESSAGE_ERROR_03,
+    MESSAGE_WRONG_IO_INSTANCE,
     MESSAGE_CANNOT_WRITE_STREAM_FORMATTER,
     MESSAGE_CANNOT_READ_STREAM_FORMATTER,
     MESSAGE_CANNOT_WRITE_FILE_TYPE_FORMATTER,
@@ -138,7 +139,7 @@ def load_data(filename,
                     if validate_io(file_type, filename):
                         content = filename
                     else:
-                        raise IOError(MESSAGE_ERROR_03)
+                        raise IOError(MESSAGE_WRONG_IO_INSTANCE)
                 else:
                     io = get_io(file_type)
                     if not PY2:
@@ -195,7 +196,7 @@ def get_writer(filename, file_type=None, **keywords):
                 extension = file_type
                 to_memory = True
                 if not validate_io(file_type, filename):
-                    raise IOError(MESSAGE_ERROR_03)
+                    raise IOError(MESSAGE_WRONG_IO_INSTANCE)
             else:
                 raise IOError(MESSAGE_ERROR_03)
         elif is_string(type(filename)):

diff --git a/pyexcel_io/constants.py b/pyexcel_io/constants.py
@@ -14,6 +14,7 @@
 MESSAGE_INVALID_PARAMETERS = "Invalid parameters"
 MESSAGE_ERROR_02 = "No content, file name. Nothing is given"
 MESSAGE_ERROR_03 = "cannot handle unknown content"
+MESSAGE_WRONG_IO_INSTANCE = "Wrong io instance is passed for your file format."
 MESSAGE_CANNOT_WRITE_STREAM_FORMATTER = "Cannot write content of file type %s to stream"
 MESSAGE_CANNOT_READ_STREAM_FORMATTER = "Cannot read content of file type %s from stream"
 MESSAGE_CANNOT_WRITE_FILE_TYPE_FORMATTER = "Cannot write content of file type %s to file %s"