delete all keys except one in dictionary

Question

I have a dictionary

lang = {\'ar\':\'arabic\', \'ur\':\'urdu\',\'en\':\'english\'}

What I want to do is to delete all the keys except one key.

Answer 1

Iterate over keys() instead:

for k in lang.keys():
    if k != 'en':
        del lang_name[k]

If you're using Python 3 I believe you need to use list(lang.keys()) instead.