Mailman 3 May 2019 - Python-ideas

Custom converters in str.format() and f-strings
by Serhiy Storchaka May 4, 2019

May 4, 2019

Currently str.format() and f-strings support three converters. Converting is specified by the "!" character followed by a letter which denotes the converter. s: str() r: repr() a: ascii() In some cases it would be useful to apply other converters. One obvious example is escaping special characters ("&", "<", ">", "'" and '"') for XML and HTML. Other applications may need other converters, for example escaping special characters (like \xff) for Telnet, or escaping non-BMP … [View More]

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add an additional dataclasses.asdict option for non-dataclasses
by Ricky Teachey May 3, 2019

May 3, 2019

I just joined the ideas list today so I do not know if this has been discussed. Using dataclasses has been great for me, but a challenge is what to do when you don't *know* if the object you are using is a dataclass, and could be a variety of other classes. This could easily occur when you don't want to assume the data type being used by the user to represent their data, but wish to turn it into a dict (if an API exists to do so). Currently, you have to do something like this when you don't … [View More]

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f-string "debug" conversion
by Eric V. Smith May 3, 2019

May 3, 2019

This idea was proposed to me at the core sprints last month by Larry Hastings. I've discussed it with a few people, who seem generally positive about it, and we've tweaked it a little bit. I've spent some time implementing it, and I think it's doable. I thought I'd post it here for any additional feedback. Here’s the idea: for f-strings, we add a !d conversion operator, which is superficially similar to !s, !r, and !a. The meaning of !d is: produce the text of the expression (not its … [View More]

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Populating a timetable with subjects
by Britto . May 1, 2019

May 1, 2019

Hi All, We have to populate a timetable with subjects. What would be the best approach? In our sample timetable there are 25 hours (keys), all the FH value should be replaced with random subjects as many as their corresponding hour. timetable = [{'A1': "FH", 'B1': "FH", 'C1': "FH", 'D1': "FH", 'E1': "FH"}, {'A2': "FH", 'B2': "FH", 'C2': "FH", 'D2': "FH", 'E2': "FH"}, {'A3': "FH", 'B3': "FH", 'C3': "FH", 'D3': "FH", 'E3': "FH"}, {'A4'… [View More]

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