在Julia中，将逗号插入整数以进行打印，例如Python 3.6+ [英] In Julia, insert commas into integers for printing like Python 3.6+

问题描述

我想将逗号插入大整数以进行打印.

I want to insert commas into large integers for printing.

julia> println(123456789)  # Some kind of flag/feature inserts commas.
"123,456,789"

在Python 3.6及更高版本中，这很容易做到:

In Python 3.6+ this is easy to do:

>>> print(f"{123456789:,d}")
123,456,789

但是，目前看来标准的Julia Julia print/println函数没有此功能.仅使用print/println函数可以做什么?

However, it does not appear that the standard Julia print/println functions have this feature at the present time. What can I do using just the print/println functions?

推荐答案

我想某些语言中最直接的方法是在printf中使用'格式修饰符.我茱莉亚，这看起来应该像这样:

I guess the most straightforward way in some languages would be to use the ' format modifier in printf. I Julia this WOULD look like so:

using Printf # a stdlib that ships with julia which defines @printf
@printf "%'d" 12345678

但是，不幸的是，此标志尚不支持，因为您会从错误中看到:

However, unfortunately, this flag is not yet supported as you can see from the error you'll get:

julia> @printf "%'d" 12345678
ERROR: LoadError: printf format flag ' not yet supported

如果您喜欢此功能，也许您应该考虑将其添加到

If you like this feature, maybe you should think about adding it to the Printf stdlib so that everyone would benefit from it. I don't know how difficult this would be though.

更新:请注意，尽管宏是在stdlib Printf中定义的，但以上错误却明确地在Base/printf.jl:48中引发.我还在此处

UPDATE: Note that although the macro is defined in stdlib Printf, the error above is explicitly thrown in Base/printf.jl:48. I also filed an issue here

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