#Use "f" to convert a number into a fixed point number, default with 6 decimals, but use a period followed by a number to specify the number of decimals:

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txt = "The price is {:.2f} dollars."

print(txt.format(45))

​

#without the ".2" inside the placeholder, this number will be displayed like this:

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txt = "The price is {:f} dollars."

print(txt.format(45))

​