Use == for comparison with string literals.

clawpack / riemann_book

An interactive book about the Riemann problem for hyperbolic PDEs, using Jupyter notebooks.

BSD 3-Clause "New" or "Revised" License

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Use == for comparison with string literals. #243

Closed ketch closed 2 years ago

ketch commented 2 years ago

In recent versions of Python, using "is" to compare with a string literal generates a warning. This patch avoids those warnings but does not change the behavior of the code.