add DosFile class for writing DOS files

edbob/files.py

@@ -36,6 +36,15 @@ import tempfile
 __all__ = ['change_newlines', 'count_lines', 'temp_path']
 
 
+class DosFile(file):
+    """
+    Subclass of ``file`` which uses DOS line endings when writing the file.
+    """
+
+    def write(self, string):
+        super(DosFile, self).write(string.replace(os.linesep, '\r\n'))
+
+
 def change_newlines(path, newline):
     """
     Rewrites the file at ``path``, changing its newline character(s) to that of