png2sprite produces lowercase hex that doesn't copy-paste into BASIC

[Robert-Lloyd3]

Line 113:
if args.f == 'acme' or args.f == 'basic': file.write("$%02x" % best)

Writes to file:
10007 DATA $00,$00,$00,__$bc__,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00

Pastes to BASIC:
10007 DATA $00,$00,$00,__$|-__,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00

LIST outputs:
10007 DATA $00,$00,$00,__$__,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00

Changing the string formatting to use capital-letter-X HEX formatting will fix output for BASIC, but I don't know if this will fix or break ACME:
if args.f == 'acme' or args.f == 'basic': file.write("$%02X" % best)

I don't use ACME. Can someone verify and submit the best fix to keep this DRY?

Thanks.