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Reference | textheight()

textheight(txt, width=None)

DescriptionReturns what would be the height of a text block drawn with the text() command, in the current font(), fontsize() and lineheight(). The first parameter sets the text string to measure, the second parameter sets the width of a line of text in block.
Returnsthe height of the text block, as a floating point number

font("Courier New")
h = textheight("hello", 30)
print h