yard is yet another Python module for drawing ROC curves. It also lets you draw precision-recall, accumulation and concentrated ROC (CROC) curves and calculate the AUC (area under curve) statistics. The significance of differences between AUC scores can also be tested using paired permutation tests.
You may also be interested in CROC, a similar package on the Python Package Index that implements ROC curves. yard was developed independently from CROC, but several features of CROC have inspired similar ones in yard.