FORMAT_VALUE packs the information about conversion flags and boolean flag that denotes whether format specifier is passed on the stack in one integer argument. It is not easy to decode this information in disassemble output. Proposed patch makes disassembler producing human readable representation of FORMAT_VALUE argument.
$ echo 'f"{a} {b:4} {c!r} {d!r:4}"' | ./python -m dis
1 0 LOAD_NAME 0 (a)
2 FORMAT_VALUE 0
4 LOAD_CONST 0 (' ')
6 LOAD_NAME 1 (b)
8 LOAD_CONST 1 ('4')
10 FORMAT_VALUE 4 (with format)
12 LOAD_CONST 0 (' ')
14 LOAD_NAME 2 (c)
16 FORMAT_VALUE 2 (repr)
18 LOAD_CONST 0 (' ')
20 LOAD_NAME 3 (d)
22 LOAD_CONST 1 ('4')
24 FORMAT_VALUE 6 (repr, with format)
26 BUILD_STRING 7
28 POP_TOP
30 LOAD_CONST 2 (None)
32 RETURN_VALUE
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