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python - How can I format a float using matplotlib's LaTeX formatter?

I have a number in my python script that I want to use as part of the title of a plot in matplotlib. Is there a function that converts a float to a formatted TeX string?

Basically,

str(myFloat)

returns

3.5e+20

but I want

$3.5 imes 10^{20}$

or at least for matplotlib to format the float like the second string would be formatted. I'm also stuck using python 2.4, so code that runs in old versions is especially appreciated.

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With old stype formatting:

print r'$%s imes 10^{%s}$' % tuple('3.5e+20'.split('e+'))

with new format:

print r'${} imes 10^{{{}}}$'.format(*'3.5e+20'.split('e+'))

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