precision in formatting float

[Skaperen]

The precision is a decimal number indicating how many digits should be displayed after the decimal point for a floating point value formatted with 'f' and 'F', or before and after the decimal point for a floating point value formatted with 'g' or 'G'.

the library reference for 3.7.2 says the above, specifically "after the decimal point". yet, what i find resulting from format() is that the precision value includes the decimal point itself. by setting the precision to 6, i get 5 decimal digits after the decimal point.

has anyone else observed this? i don't know whether this is a bug or a documentation error.

i am using 3.6.9 and reading docs for 3.7.2 because PDF was messed up for 3.6. i wonder if any of this has changed in later versions.

[snippsat]

yet, what i find resulting from format() is that the precision value includes the decimal point itself. by setting the precision to 6, i get 5 decimal digits after the decimal point.

>>> n = 1.1122334455
>>> print(f"The numbers after decimal place {n:.6f}")
The numbers after decimal place 1.112233
>>> print(f"The numbers after decimal place {n:.12f}")
The numbers after decimal place 1.112233445500
>>> 
>>> print("The numbers after decimal place {:.6f}".format(n))
The numbers after decimal place 1.112233
>>> print("The numbers after decimal place {:.12f}".format(n))
The numbers after decimal place 1.112233445500

So work as expected,make no difference if use Python 3.6 or as i use here newest Python 3.10.4.
The rule is:

f'{value:{width}.{precision}}'

width specifies the number of characters total to display.

[Skaperen]

i get the same results you do with your examples. these are what i expect from reading the docs. i need to go find what i did to get the apparently non-compliant results.