[Python-Dev] PEP 515: Underscores in Numeric Literals (original) (raw)

Steven D'Aprano steve at pearwood.info
Thu Feb 11 05:29:48 EST 2016

On Thu, Feb 11, 2016 at 08:07:56PM +1000, Nick Coghlan wrote:

Given that str.format supports a thousands separator:

>>> "{:,d}".format(100000000) '100,000,000' it might be reasonable to permit "" in place of "," in the format specifier.

+1

However, I'm not sure when you'd use it aside from code generation, and you can already insert the thousands separator and then replace "," with "".

It's not always easy or convenient to call .replace(",", "_") on the output of format:

"With my help, the {} caught {:,d} ants.".format("aardvark", 100000000)

would need to be re-written as something like:

py> "With my help, the {} caught {} ants.".format("aardvark", "{:,d}".format(100000000).replace(",", "_")) 'With my help, the aardvark caught 100_000_000 ants.'

-- Steve

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