Change is/is not to ==/!= for literal comparisons #264
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petrasovaa
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This PR fixes
SyntaxWarning: "is" with a literal. Did you mean "=="?warnings (new in Python 3.8?)https://trac.osgeo.org/grass/ticket/4011
https://bugs.python.org/issue34850 (Python dev discussions)
Maybe, also
== None=>is Noneand!= None=>is not Nonefor better semantics?