Improve docstring on helper method

Author: Hugo Osvaldo Barrera

barcode/__init__.py

@@ -43,13 +43,26 @@
 
 
 def get(name, code=None, writer=None, options=None):
+    """Helper method for getting a generator or even a generated code.
+
+    :param str name: The name of the type of barcode desired.
+    :param str code: The actual information to encode. If this parameter is
+        provided, a generated barcode is returned. Otherwise, the barcode class
+        is returned.
+    :param Writer writer: An alternative writer to use when generating the
+        barcode.
+    :param dict options: Aditional options to be passed on to the barcode when
+        generating.
+    """
+
     options = options or {}
     try:
         barcode = __BARCODE_MAP[name.lower()]
     except KeyError:
         raise BarcodeNotFoundError(
             'The barcode {0!r} you requested is not known.'.format(name)
         )
+
     if code is not None:
         return barcode(code, writer, **options)
     else: