如果 Julia 中提供类似 f 字符串的字符串格式？

Question

So I am new to Julia and learned various ways of string formatting. Mainly from websites similar to this .

So I use f-strings a lot in Python, not a big fan of.format(). So I was wondering since someone created Formatting.jl Package to bring.format() like feature in Julia, is there any ongoing or useful package which does same for f-strings? Now I googled a bit about it too but didn't find anything.

What my main issue is that I want to replicate this behaviour:

a = 10
b = 20
print(f'The multiplication is = {a * b}')

In case anyone wondering what are f-strings, refer to this .

Answer 1

Yes, it is possible with standard Julia strings:

x = "World!"
y = 42
greeting = "Hello $x, $(y^2) !" # gives "Hello World!, 1764 !"

See also here:

https://docs.julialang.org/en/v1/manual/strings/#string-interpolation

Edit: The example in the comment above is

j = 10; b = 20
println("The numbers and their square are $j, $b and $(j^2), $(b^2)")

Answer 2

If you want more control over numeric formatting than the default string interpolation, you can use the Formatting.jl package in Julia, which provides Python f-string functionality.

Answer 3

There is PyFormattedStrings.jl , which is fast and in my experience replicates the Python behaviour most closely out of all the options.

Package	Syntax
PyFormattedStrings.jl	f"result = {do(something):.3g}"
Fmt.jl	f"result = {$(do(something)):.3g}"
Formatting.jl	fmt("result = {:.3f}", do(something))

Note that Formatting has no g support. PyFormattedStrings does not support centering, while Fmt does. Neither supports the Python 3.8 f"{4+4=}" syntax.