Device instantiation fails on OS X Mavericks
The following is consistent and representative of the failure mode. Note this is similar to the issue which previously required an unload of the FTDI serial driver (e.g. as installed by Arduino), but this appears to be different, as that driver isn't (apparently) loaded.
MacBook-Air:~ ben$ sudo python Python 2.7.5 (default, Aug 25 2013, 00:04:04) [GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from pylibftdi import * >>> Driver().list_devices() [('FTDI', 'UB232R', 'FTAS1UN5')] >>> Driver().libftdi_version() (1, 0, 0, '1.0', 'unknown') >>> d = Device() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Library/Python/2.7/site-packages/pylibftdi/driver.py", line 236, in __init__ self.open() File "/Library/Python/2.7/site-packages/pylibftdi/driver.py", line 291, in open raise FtdiError(msg) pylibftdi._base.FtdiError: device not found (-3) >>>