gh-123363: Show string value of CONTAINS_OP oparg in dis

[Alexandr153]

Result:

>>> echo 'a not in  b' | ./python.exe -m dis
  0           RESUME                   0

  1           LOAD_NAME                0 (a)
              LOAD_NAME                1 (b)
              CONTAINS_OP              1 (not in)
              RETURN_VALUE

>>> echo 'a in  b' | ./python.exe -m dis
  0           RESUME                   0

  1           LOAD_NAME                0 (a)
              LOAD_NAME                1 (b)
              CONTAINS_OP              0 (in)
              RETURN_VALUE

• Issue: CONTAINS_OP can provide the operation name #123363

[ghost]

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[bedevere-app]

Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

[Eclips4]

Thanks!

[sobolevn]

Thank you!