python 2.7 - Whats means the : operator in str.format()? -

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take {:.2f}.format(x) example. gives me output fixed-point number precision 2 output. : means? have question: why upper function doesn't work when give input x = 7.5643915285818e+210+4.6951592215e+280j?

colon (:) used instead of % in formatting.

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