Terry J. Reedy added the comment:
"The precision is a decimal number indicating how many digits should be
displayed ... before and after the decimal point for a floating point value
formatted with 'g' or 'G'. It seems that str, repr, and '' are using precision
16, and the doc should be changed to match.
>>>str(.314159265358979323846264338327950288419)
'0.3141592653589793' # 16, not counting 0.
>>> '{}'.format(3.14159265358979323846264338327950288419)
'3.141592653589793'
>>> '{:.16g}'.format(3.14159265358979323846264338327950288419)
'3.141592653589793'
>>> str(3.14159265358979323846264338327950288419)
'3.141592653589793' # 16
But I discovered this 'anomaly' (bug?)
>>> str(31.4159265358979323846264338327950288419)
'31.41592653589793'
>>> str(33.14159265358979323846264338327950288419)
'33.1415926535898' # precision 15
I expected this last to be
'33.14159265358979'
as 32... rounds down, not up.
repr and '{}'.format act the same.
----------
nosy: +terry.reedy
stage: -> needs patch
type: -> behavior
versions: +Python 3.4, Python 3.5 -Python 3.3
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22546>
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