MRAB wrote: > Sheldon wrote: > > MRAB wrote: > > > Sheldon wrote: > > > > Hi. > > > > > > > > Does anyone know if one can resume a python script at the error point > > > > after the error is corrected? > > > > I have a large program that take forever if I have to restart from > > > > scratch everytime. The error was the data writing a file so it seemed > > > > such a waste if all the data was lost and must be recalculated again. > > > > > > > You could modify the program while you're debugging it so that instead > > > of, say: > > > > > > calculate data > > > write data > > > > > > you have: > > > > > > if saved data exists: > > > load data > > > else: > > > calculate data > > > save data > > > write data > > > > > > The pickle module would be useful here. > > > > > > Matthew > > > > I like your idea Matthew but I don't know how to pickle the many > > variables in one file. Do I need to pickle each and every variable into > > a seperate file? > > var1,var2 > > pickle.dump(var1,f) > > pickle.dump(var2,f2) > > > Using the 'pickle' module: > > # To store: > f = open(file_path, "wb") > pickle.dump(var1, f) > pickle.dump(var2, f) > f.close() > > # To load > f = open(file_path, "rb") > var1 = pickle.load(f) > var2 = pickle.load(f) > f.close() > > A more flexible alternative is to use the 'shelve' module. This behaves > like a dict: > > # To store > s = shelve.open(file_path) > s["var1"] = "first" > s["var2"] = [2, 3] > s.close() > > # To load > s = shelve.open(file_path) > print s["var1"] # This prints "first" > print s["var2"] # This prints [2, 3] > s.close() > > Hope that helps > Matthew
Perfect Matthew! Much obliged! /Sheldon -- http://mail.python.org/mailman/listinfo/python-list
