Highlight improvement about `%d` in the datetime format

[liangshan]

• Editor name and version: VSCode 1.19
• Platform: MacOS
• Color scheme: Dark+
• MagicPython version: Default
• A sreenshot:
  

When %d is part of datetime format string, i think it should not be highlighted.

[vpetrovykh]

As has been mentioned in similar issues already, it is not possible to always correctly infer that a particular string is a "datetime format" string. E.g.:

dt_format = 'The date is: %Y%m%d'
# format output
dt_out = datetime.strftime(datetime.now(), dt_format)

# parse input
my_datetime = datetime.strptime('The date is: 20180719', dt_format)

If the code is yours, you can choose to use r'%Y%m%d' or R'%Y%m%d' to avoid format highlighting. Note that r'...' will be highlighted as if it were a regex string, while R'...' is a raw string with no frills.

Additionally, the issue #106 has a proposal that would allow configuring the color scheme to hide %-formatting completely (implemented and being reviewed as of this writing).

[vpetrovykh]

Python 3.6 introduced f-strings, which are the preferred way to format strings now.

E.g.

# format output directly
dt_out = f'The date is: {datetime.now():%Y%m%d}'

# format output via variable
dt_format = r'%Y%m%d'
dt_out = f'The date is: {datetime.now():{dt_format}}'

[1st1]

Python 3.6 introduced f-strings, which are the preferred way to format strings now.

In fact we should consider dropping support for %s formatting.