Python小数位值固定

Question

I'm trying to have always 2 decimal places in a float number, eg:

3.28329482394283104923804 -> 3.28
3.0 -> 3.00
3 -> 3.00

with round(x,2) , but the problem is that the second case (3.0 -> 3.00) is returning 3.0 instead of 3.00 . What can I do?

I have the values and I'm creating a string like this:

final = "The number is " + str(number)

Answer 1

If you just want to round off the number to obtain a string to display, you can do,

Try this:

print("{:.2f}".format(3.28329482394283104923804)) outputs 3.28

print("{:.2f}".format(3.0)) outputs 3.00

print("{:.2f}".format(3)) outputs 3.00

OR using the fstrings in python,

print(f'{3.28329482394283104923804:.2f}') outputs 3.28

print(f'{3.0:.2f}') outputs 3.00

print(f'{3:.2f}') outputs 3.00

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UPDATE (as you asked in comments):

final = f"The number is {number:.2f}"