desiconda normpath and fix 'is not' SyntaxWarning #150
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This PR makes desiInstall more robust to a non-standard
$DESICONDA
by filtering it throughos.path.normpath
before parsing it. In particular the previous version interpreted/global/common/software/desi/cori/desiconda/20200801-1.4.0-spec//conda
as version '' (blank) instead of '20200801-1.4.0-spec' due to the double slash.It also fixes a py3.8 SyntaxWarning about using
is not
instead!=
when comparing a variable to a literal (prior syntax happens to work with cpython, but isn't guaranteed by the language syntax).blat is not None
is still ok, butblat is not ""
raises a SyntaxWarning in py3.8.