CI: Fixed linting on download_wheels (#21042)

Author: TomAugspurger

scripts/download_wheels.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 """Fetch wheels from wheels.scipy.org for a pandas version."""
 import argparse
 import pathlib
@@ -23,7 +24,7 @@ def fetch(version):
     dest.mkdir(exist_ok=True)
 
     files = [x for x in root.xpath("//a/text()")
-             if x.startswith(f'pandas-{version}')
+             if x.startswith('pandas-{}'.format(version))
              and not dest.joinpath(x).exists()]
 
     N = len(files)
@@ -32,7 +33,9 @@ def fetch(version):
         out = str(dest.joinpath(filename))
         link = urllib.request.urljoin(base, filename)
         urllib.request.urlretrieve(link, out)
-        print(f"Downloaded {link} to {out} [{i}/{N}]")
+        print("Downloaded {link} to {out} [{i}/{N}]".format(
+            link=link, out=out, i=i, N=N
+        ))
 
 
 def main(args=None):