Didn't work implicit concat strings

[wimglenn]

Thanks for making this really helpful tool! I did find one problem:

Input:

d = "dog"
msg = (
    "The quick brown fox jumps over the lazy dog "
    "The quick brown fox jumps over the lazy {}".format(d)
)

Expected output:

d = "dog"
msg = (
    "The quick brown fox jumps over the lazy dog "
    f"The quick brown fox jumps over the lazy {d}"
)

Actual output:

Same as input - unchanged. Adding -tc -tj -a makes no difference.

[ikamensh]

Thanks for the report!

So before AST module started including start charno of nodes (<3.8), it was impractically difficult to code, so currently it explicitly prefers not to touch such code, as far as I remember. This might be reasonably easy to implement now.

However, this begs for bigger refactoring - using only AST for .format / % calls (which currently use custom state machine).