CODEWITHSUNDEEP
pythonpython-3.xmathfloating-point
MShakeG
MShakeG

Reputation: 613

How to remove last decimal digit from float in python?

Say I have an arbitrary float x = 123.123456 and want to remove the last n decimal digits from the float i.e. n = 1 then x = 123.12345, n = 2 then x = 123.1234 and so on. How can this be achieved in python?

Upvotes: 1

Views: 2699

Answers (1)

ljmc
ljmc

Reputation: 5264

This will do the trick you are asking, but be mindful of the issues with floating point numbers.

# let's cut 2 digits
n = 2

# naively we can do this
f = 123.123456
short_f = float(str(f)[:-n])

# but watch out for floating point error
f = 1.2 - 1.0  # f should be 0.2 but is actually 0.19999999999999996
short_f = float(str(f)[:-n])  # so this gives 0.199999999999999

This sounds like an XY problem, maybe you are looking for round or string formatting.

Upvotes: 2

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