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I suggest you to add expr = string.replace(expr,",",".")in the beginnig to handle users, who use "," instead of ".", because it is common to write 3,14 instead od 3.14 in several European countries.
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I suggest you to add
expr = string.replace(expr,",",".")
in the beginnig to handle users, who use "," instead of ".", because it is common to write 3,14 instead od 3.14 in several European countries.