When it prints It is not possible to upload a file without a summary/description., it should imperatively ask a description instead of ask Do you want to change this description? which is empty.
python pwb.py upload -family:commons -lang:commons test Invalid input filename given. Try again. URL, file or directory where files are now: https://farm3.staticflickr.com/2895/33707537950_fc233821a0_o_d.jpg The filename on the target wiki will default to: 33707537950_fc233821a0_o_d.jpg Enter a better name, or press enter to accept: Dafodills_33707537950_fc233821a0_o_d.jpg The suggested description is: It is not possible to upload a file without a summary/description. Do you want to change this description? ([Y]es, [n]o, [q]uit): y Uploading file to commons:commons via API... Reading file https://farm3.staticflickr.com/2895/33707537950_fc233821a0_o_d.jpg Upload of Dafodills_33707537950_fc233821a0_o_d.jpg successful.