Here's an updated PKGBUILD that also removes the need for python-dephell

pkgname=python-wikitextparser
pkgver=0.52.1
pkgrel=1
pkgdesc="simple parsing tool for MediaWiki's wikitext markup"
arch=('any')
url="https://github.com/5j9/wikitextparser"
license=('MIT')
depends=(python)
makedepends=(python-build python-installer python-setuptools python-wheel)
source=("$pkgname-$pkgver.tar.gz::https://github.com/5j9/wikitextparser/archive/v$pkgver.tar.gz")
sha256sums=('caa0d6c1572ee9dc63a9c08872f32bf78a774f6a9c8babcb9216b2212a9cbc2b')

build() {
  cd "$srcdir"/wikitextparser-$pkgver
  python -m build --wheel --no-isolation
}

package() {
  cd "$srcdir"/wikitextparser-$pkgver
  python -m installer --destdir="$pkgdir" dist/*.whl
  install -Dm644 LICENSE.md -t "$pkgdir"/usr/share/licenses/$pkgname
}

@mortzu Could you update the package?