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Simplest/Idiomatic way to count files in a directory (using pathlib)

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  Simplest/Idiomatic way to count files in a directory (using pathlib) Travis Griggs <travisgriggs@gmail.com> - 2015-06-22 15:31 -0700
    Re: Simplest/Idiomatic way to count files in a directory (using pathlib) Paul Rubin <no.email@nospam.invalid> - 2015-06-22 18:32 -0700
      Re: Simplest/Idiomatic way to count files in a directory (using pathlib) Terry Reedy <tjreedy@udel.edu> - 2015-06-23 12:17 -0400

#93019 — Simplest/Idiomatic way to count files in a directory (using pathlib)

Subject nearly says it all.

If i’m using pathlib, what’s the simplest/idiomatic way to simply count how many files are in a given directory?

I was surprised (at first) when

    len(self.path.iterdir())

I don’t say anything on the in the .stat() object that helps me.

I could of course do the 4 liner:

    count = 0
    for _ in self.path.iterdir():
        count += 1
    return count

The following seems to obtuse/clever for its own good:

    return sum(1 for _ in self.path.iterdir())

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#93025

Travis Griggs <travisgriggs@gmail.com> writes:
> The following seems to obtuse/clever for its own good:
>     return sum(1 for _ in self.path.iterdir())

I've generally done something like that.  I suppose it could be added to
itertools.

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#93041

On 6/22/2015 9:32 PM, Paul Rubin wrote:
> Travis Griggs <travisgriggs@gmail.com> writes:
>> The following seems to obtuse/clever for its own good:
>>      return sum(1 for _ in self.path.iterdir())

I disagree.  For one who understands counting and Python, this is a 
direct way to define the count of a finite iterable.  A functionalist 
would prefer it to the obvious 3-line version with a for statement.

> I've generally done something like that.  I suppose it could be added to
> itertools.

itertools callables all produce iterators.  The above only consumes an 
iterable.

-- 
Terry Jan Reedy

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