By converting it into a string, Dynamo adds me some extra digits.
Can I remove them in Dynamo or in Revit?
You can use the split node to split the string by , for example. Or you can use the string remove node
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How does that look like?
There’s a node in the Data-Shapes package names “Number to Rounded String”
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Where is the Solution without Digits?
0 for incoming for Crumple String.rounding node at digits level
and 6 instead of 4 in the code block for the remove solution
Cordially
christian.stan
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explanation.
You can use the Number.ToString node from Springs or do it in a Python node in different ways(I prefer the one below):
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Use some magic with regex, if 1,23545 is input or 1,323443dadwa 
input = IN[0]
import re
OUT = re.sub(r',.*', '', input)
With input is 1.3565 or 1.4343dadawdwa
input = IN[0]
import re
re.sub(r'\..*', '', input)
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For information, rstrip method can accept multiple characters as argument
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You can also fix this by just converting the number to an integer. Math.Floor (or Ceiling) will work. This happens when the number is a double and the string includes the trailing zeroes.
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Love the options everyone 
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I didn’t know that, but it would still make a 20.000 into a 2, wouldn’t it?
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Correct, thats why i would just use python’s round() function and turn that into a string.
good catch, I didn’t consider this case, so it doesn’t work
Thank you!!!