Syntax error dimorphite_dl.py, line #744

[Norwid Behrnd]

Dear Professor Durrant,
Dear maintainer of Dimorphite-DL,

I would like to suggest substitution of a line in script dimorphite_dl.py, line #744. Currently (2021-03-03), the file states

if line is not "":

which causes, running the script in Linux Debian 11 / bullseye (branch testing) with Python 3.9.1 the brief note

SyntaxWarning: "is not" with a literal. Did you mean "!="?
if line is not "":

The warning may be muted if the line in question reads

if line is not None:

instead. Replying to an issue about OpenBabel on GitHub

https://github.com/openbabel/openbabel/issues/2330

your program was one of the first programs seen a couple of moments ago, possibly complementary to the one your colleague, Geoff Hutchison , curates.

With best regards,

Norwid Behrnd

[Author]

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