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Reference | textmetrics()

textmetrics(txt, width=None)

DescriptionReturns what would be the width and 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.
Returnsa tuple containing the width and height of the text block

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