How to remove quotes from '156.70' in Python?

Question

I'm trying to make a rounding function in Python to make proper significant figures but I don't know how to remove the quotes from the answer, an ex. is '156.70', I want to have the number with 2 decimal place precision, and round(156.70,2) returns 156.7.

I have tried this: format(round(156.70,2),'.2f'), but it places the answer in single quotes like I stated above. Is there a way to round directly with the floating point zero, or is there a way to remove the quotes?

I have also tried the strip command which does not remove the quotes.

I also tried converting the answer (156.70) to a numpy array to remove the quotes the following way:

ares1 = np.array(format(round(ans,2),".2f"))
values = ares1.item().split(' ')
ares = np.asarray(values, dtype='float')

Where 'ans' is the value 156.7 I want to round to two precision points. Thanks for any help.

Answer 1

Precision doesn't work in programming as it works in real life. By default, numbers have infinite precision, and any decimal places after the defined decimal places will be zeroes. So, your number 156.7 is the same as 156.70 and 156.7000, as they will all be stored identically in memory.

Now with that out of the way, you can definitely "format" the number when outputting it. That will not edit the actual stored value, but will give you a String representation of the number for display purposes only. For that, I'll refer you to this StackOverflow question.