ArcMap adds decimal to string conversion

Question

ArcMap dropped the leading zero from the census block ID for California. When I added a new text field, GEOID, in the field calculator with the formula,
GEOID = "0" + str(!BLOCK_2020!)

ArcMap created the text field but populated it with one decimal place -- for example, 060014001001001.0.
Any idea what I'm doing wrong?

Vince · Answer

Always use str.format() to control formatting (vice a str cast), then you can do something like:
geoid = "{:015d}".format(long(!block_2020!))

Under Python3 (ArcGIS Pro) that "long" becomes "int":
geoid = "{:015d}".format(int(!block_2020!))

ArcMap adds decimal to string conversion

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