quantopian / zipline / 10507

87%

master: 88%

Pull #2554

travis-ci

PERF: Avoid slow exception repr in blaze.

The error raised by blaze when you do a field lookup with a nonexistent key on
an expression shows the repr of the expression, which contains the expression's
entire dshape. For exprs that are part of a very large tree, rendering the
dshape can take a significant amount of time.

Band-aid fix this for now by checking if the field exists before doing the
lookup. This saves 30-40 seconds (!) of startup time on Quantopian research.

5 of 5 new or added lines in 1 file covered. (100.0%)

28046 of 32160 relevant lines covered (87.21%)

2.62 hits per line