problem displaying sympy rendered svg in python

Question

I have the following program which uses sympy and svgmath to render a user\'s algebraic expression. It nearly works but there are a few issues:

1. The svg is not

Answer 1

You should close the file handles, because otherwise the data written may not yet have been flushed to the filesystem.

parser.parse()
output.close()

Alternatively, use a with expression.

with open("test.svg", "w") as output:
    ...
    parser.parse()
load()

Does an actual svg file need to be produced?

I think QSvgWidget offers a load slot, which takes a byte string with the file contents.