How does PathLib Works

Question

I was using Pathlib on Python3.x and I found a piece of code that got me curious.

from pathlib import Path
BASE = Path('/mydir').resolve(strict=True).parent.parent
print( BASE / 'Sub-dir')

And that works perfectly, printing out:

/mydir/Sub-dir

I got curious to understand how that works, if someone could help me out. Regards

Start off by using it. Later on you can worry about how it works... — user32882, Aug 26 '20 at 19:56
I just got curious of how Python interprets the instance of Path class and adds the subdirectory. — Lucca Marques, Aug 26 '20 at 23:06

score 1 · Accepted Answer · answered Aug 26 '20 at 20:25

1

It implements the __truediv()__ method.

def __truediv__(self, key):
    try:
        return self._make_child((key,))
    except TypeError:
        return NotImplemented

__truediv()__ defines how the division operator / works with objects of the class. In this case, it makes a child path with the second operand

answered Aug 26 '20 at 20:25

Pranav Hosangadi

So basically this changes the original functionality of __truediv()__ method? – Lucca Marques Aug 26 '20 at 23:04
1

I just saw your comment @LuccaLemeMarques. There's no _original_ functionality. You give it that functionality (the ability to participate in an expression of the form `a / b`) by implementing the method. – Pranav Hosangadi Jun 25 '21 at 16:13

1 Answers1