use pathlib in docs/autogen_shortcuts.py + minor refactor

docs/autogen_shortcuts.py

@@ -1,4 +1,4 b''
-from os.path import abspath, dirname, join
+from pathlib import Path
 
 from IPython.terminal.shortcuts import create_ipython_shortcuts
 
@@ -75,16 +75,10 b' for kb in ipy_bindings:'
 
 
 if __name__ == '__main__':
+    here = Path(__file__).parent
+    dest = here / 'source' / 'config' / 'shortcuts'
 
-    sort_key = lambda k:(str(k[0][1]),str(k[0][0]))
-
-    here = abspath(dirname(__file__))
-    dest = join(here, 'source', 'config', 'shortcuts')
-
-    with open(join(dest, 'single_filtered.csv'), 'w') as csv:
-        for k, v in sorted(single_filter.items(), key=sort_key):
-            csv.write(':kbd:`{}`\t{}\t{}\n'.format(k[0], k[1], v))
-
-    with open(join(dest, 'multi_filtered.csv'), 'w') as csv:
-        for k, v in sorted(multi_filter.items(), key=sort_key):
-            csv.write(':kbd:`{}`\t{}\t{}\n'.format(k[0], k[1], v))
+    for filters, output_filename in [(single_filter, 'single_filtered'), (multi_filter, 'multi_filtered')]:
+        with (dest / '{}.csv'.format(output_filename)).open('w') as csv:
+            for (shortcut, flt), v in sorted(filters.items(), key=lambda ((shortcut, flt), v): (str(shortcut), str(flt))):
+                csv.write(':kbd:`{}`\t{}\t{}\n'.format(shortcut, flt, v))