[   32s] xml2po --expand-all-entities -o po/slideshow.pot slideshow.xml
[   33s] Traceback (most recent call last):
[   33s]   File "/usr/bin/xml2po", line 191, in <module>
[   33s]     main(sys.argv[1:])
[   33s]   File "/usr/bin/xml2po", line 160, in main
[   33s]     xml2po_main = Main(default_mode, operation, output, options)
[   33s]   File "/usr/lib/python3.8/site-packages/xml2po/__init__.py", line
559, in __init__
[   33s]     self.out = file(output, 'w')
[   33s] NameError: name 'file' is not defined

I assume it should be open(output, 'w') instead?