These format specifications work on strings ( str) and most other types (any type that doesn't specify its own custom format specifications): Fill CharĪll the above options were about the format specifications (the part after a : within a format string replacement field).įormat specifications are object-specific ( str, int, float, datetime all support a different syntax). These format specifications work only on integers ( int): AltĪn empty type is synonymous with d for integers. There's also g, G, e, E, n, and F types for floating point numbers and c, o, and n types for integers which I haven't shown but which are documented in the format specification mini-language documentation. These string formatting techniques work an all numbers (both int and float): Fill
Here's a summary of the various options within the format specification field for generic number formatting. Or use the fstring.help/cheat to quickly find these reference tables. You can use the below tables as cheat sheets to help you during your string formatting adventures. 😅 Cheat sheetsĮxamples are great, but it's hard to hold many examples in your head at once. It sounded pretty good to me, so I'm using it as if it's an official term. I've been calling it a self-documenting expression but that term is only used a single time in the documentation within a header. The = syntax also doesn't seem to have an official name. You can see some examples in What's new in Python 3.8, but the only other mention of = is in the Lexical Analysis page, which is a very dense page (with few code examples) that describes Python's syntax at a very low level. Python's various format specifiers are documented in an odd and very dense format specification mini-language section within the string module documentation (the string module, not the str class).īut using = to make a self-documenting expression isn't mentioned anywhere on that page. Unfortunately this isn't very well documented. name = "Trey" > print ( f " " ) sum(costs) = 3.80
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