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, works with Decimal() against the doc of **Format Specification Mini-Language** #136636

@hyperkai

Description

@hyperkai

Bug report

Bug description:

The doc of Format Specification Mini-Language doesn't say that , works with Decimal() as shown below:

',': Inserts a comma every 3 digits for integer presentation type 'd' and floating-point presentation types, excluding 'n'. For other presentation types, this option is not supported.

But , works with Decimal() against the doc as shown below:

from decimal import Decimal

v = Decimal(value='1234.5555555555')

print('"{:,.20f}"'.format(v))
print('"{:,.20F}"'.format(v))
# "1,234.55555555550000000000"
#        |        20        |

print('"{:,f}"'.format(v))
print('"{:,F}"'.format(v))
# "1,234.5555555555"
#        |   10   |
from decimal import Decimal

v = Decimal('123456.78912')

print('"{:,.20g}"'.format(v))
print('"{:,.20G}"'.format(v))
print('"{:,.20}"'.format(v))
print('"{:,g}"'.format(v))
print('"{:,G}"'.format(v))
print('"{:,}"'.format(v))
# "123,456.78912"
#  |    11     |

In addition, the doc doesn't say that _ works with Decimal() as shown below:

'_': Inserts an underscore every 3 digits for integer presentation type 'd' and floating-point presentation types, excluding 'n'. For integer presentation types 'b', 'o', 'x', and 'X', underscores are inserted every 4 digits. For other presentation types, this option is not supported.

So, _ doesn't work with Decimal() as the doc doesn't say so as shown below:

from decimal import Decimal

v = Decimal(value='1234.5555555555')

print('"{:_.20f}"'.format(v))
print('"{:_.20F}"'.format(v))
print('"{:_f}"'.format(v))
print('"{:_F}"'.format(v))
# ValueError: invalid format string
from decimal import Decimal

v = Decimal('123456.78912')

print('"{:_.20g}"'.format(v))
print('"{:_.20G}"'.format(v))
print('"{:_.20}"'.format(v))
print('"{:_g}"'.format(v))
print('"{:_G}"'.format(v))
print('"{:_}"'.format(v))
# ValueError: invalid format string

CPython versions tested on:

3.12

Operating systems tested on:

Windows

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    3.13bugs and security fixesextension-modulesC modules in the Modules dirstdlibPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or error

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