fix when numbers are passed

git-svn-id: http://svn.code.sf.net/p/pyserial/code/trunk/pyserial@303 f19166aa-fa4f-0410-85c2-fa1106f25c8a

1 files changed, 12 insertions, 4 deletions

diff --git a/serial/__init__.py b/serial/__init__.py
index 6874843..d7d968f 100644
--- a/serial/__init__.py
+++ b/serial/__init__.py
@@ -32,12 +32,20 @@ def serial_for_url(url, *args, **kwargs):
     # check remove extra parameter to not confuse the Serial class
     do_open = 'do_not_open' not in kwargs or not kwargs['do_not_open']
     if 'do_not_open' in kwargs: del kwargs['do_not_open']
+    # the default is to use the native version
+    klass = Serial   # 'native' implementation
     # check port type and get class
-    if url.lower().startswith('rfc2217://'):
-        import rfc2217  # late import, so that users that don't use it don't have to load it
-        klass = rfc2217.Serial # RFC2217 implementation
+    try:
+        url_nocase = url.lower()
+    except AttributeError:
+        # its not a string, use default
+        pass
     else:
-        klass = Serial   # 'native' implementation
+        if url_nocase.startswith('rfc2217://'):
+            import rfc2217  # late import, so that users that don't use it don't have to load it
+            klass = rfc2217.Serial # RFC2217 implementation
+        else:
+            klass = Serial   # 'native' implementation
     # instantiate and open when desired
     instance = klass(None, *args, **kwargs)
     instance.port = url