A context manager that creates savepoints, avoiding recalculating expensive parts of the code. Useful if you're running a script several times while developing it.
from savepoint import SavePoint a = 10 b = 20 # do some expensive calculation here with SavePoint("stuff.p"): print "doing stuff" a += 10 c = 30 print a, b, c
We now run the script twice:
$ python script.py doing stuff 20 20 30 $ python script.py 20 20 30
The first time the code is ran the
with block is executed, and the modifed scope is pickled to
stuff.p. Subsequent runs will update the global scope from the pickle file, and skip the block completely.
Note that only changes in the scope are stored, but not file modifications and other side effects of the block. Also, if the original input is different the code will fail; this will be fixed in the future, so that the savepoint is only used if the initial scope is unchanged.