that snippet is python, not C. Are you using python or C? More on reddit.com

You can't cast floats directly into Decimals, however (the floats are imprecise, and Python can't guess how you want them rounded,) so I will almost always convert them to a rounded string representation first (that's the "%.2f" % float_val -- %.2f means to display only two decimals, and then ... More on stackoverflow.com

Note: If you are using Python 3.6+ you can also use an f-string: ... Although this works, you're not explaining how the format function works, which is what was requested 2019-09-30T16:45:21.217Z+00:00 ... Leo V. Over a year ago · @lmiguelvargasf thank you for you clarification ill keep that in mind when using the format command. 2019-09-30T17:40:06.7Z+00:00 ... Save this answer. ... Show activity on this post. ... When you use a .2f ... More on stackoverflow.com

A couple of things (bug) nlist.append(i:.2f) is not legal syntax. What you're probably trying to do is nlist.append("i:%.2f" % i). This is one of python's many forms of string parameter expansion. I might suggest the use of the 3.6+ f-stringprefix feature, which would look like nlist.append(f"i:{i:.2f}"). If this looks confusing, consider how it compares to: nlist.append(f"the value of i is:{i:.2f}"). Avoid renaming builtins, such as list. Call the arg vals or something else that isn't a builtin type. You should be documenting and annotating your code. This would look like def formatted(vals: list[float]) -> list[str]:. While type annotations have no runtime annotations, you can use tools (such as pytype) to type-analyze your code. Any time you find yourself iterating over something, only to append to a list (or add to a set, etc..), consider the use of a comprehension. In practice, that would look like: return [f"i:{val:.2f}" for val in vals] (apropos of #1 and #2 above). Putting all of that together, I would probably rewrite that function as: def formatted(vals: list[float]) -> list[str]: """Translate vals to a string representation.""" return [f"i:{val:.2f}" for val in vals] Note that I've used 3.9+ features here. Also, that docstr is maybe a bit 'iffy (e.g. "how" is it translated?), but you get the idea. It's not my intention to cast shade on your work, I understand you're just learning. These are just some tips to help steer you in the right direction for later :) (sneaky edit) I misspoke about rounding vs. truncation, ignore that bit :p More on reddit.com