Python decimal formatting results inconsistent

Asked May 04 '17 at 17:14

Active May 04 '17 at 18:37

Viewed 42 times

Problem is to find the equation of a circle given three points. Got the math part down, but I'm having trouble getting the answer in the right format:

(x-Cx)^2+(y-Cy)^2=r^2

Specs say two digits after the decimal, but drop trailing 0s and decimals when appropriate. Here's the string I'm returning:

"(x-{0:.3g})^2+(y-{1:.3g})^2={2:.3g}^2".format(Cx, Cy, r)"

Here is an example:

Cx: 6.0000000000000000002 Cy: 5.74999999... r: 3.25

Result: "(x-6.00)^2+(y-5.75)^2=3.25^2"

Expecting: "(x-6)^2+(y-5.75)^2=3.25^2"

Edit: The code in question

edited May 04 '17 at 18:37

asked May 04 '17 at 17:14

Stockdoodle Gish

switch to Python 3? Also if it actually is Python 2.X you are using, tag it please. – Ma0 May 04 '17 at 17:19
See this: http://stackoverflow.com/questions/2440692/formatting-floats-in-python-without-superfluous-zeros – Liran Funaro May 04 '17 at 17:19
Python3. Updated tag. – Stockdoodle Gish May 04 '17 at 17:22
This works for me in python 2.7 as well. Just use `"%.2g" % Cx` notation instead of `.format`. – Liran Funaro May 04 '17 at 17:22
Does this just boil down to `"{:.3g}".format(6.0000000000000000002)`? That prints `6` for me. – tdelaney May 04 '17 at 17:52

Python decimal formatting results inconsistent

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