I see, however this well may be an error in the example code, given the comment
i.e.
Quote: # at this point, *numbers* still has 1_000_000 key/values, and
# *numbers_without_997_multiples* is a copy of *numbers* without
# values that are multiples of 997.
i.e.
copy
definitely has changed
If you can't explain it to a six year old, you don't understand it yourself, Albert Einstein
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs