not None test in Python
106983
Python `if x is not None` or `if not x is None`?
85934
When should a Test Case be marked as "No Apply"?
84087
Difference between wouldn't and didn't
67586
Defining my own None-like Python constant
154074
Non-parametric test equivalent to mixed ANOVA?
123684
Test for non-zero length string in Bash: [ -n "$var" ] or [ "$var" ]
149035
Using "neither" without "nor"
130730
There is no or there was no
41529
Can "nor" be used without "neither"?
103065
Using the not equal operator for string comparison
22064
What's a standard way to do a no-op in python?
71704
Conjunctions in negation: "no/neither" and "and/or/nor"
145988
How do I capture SIGINT in Python?
16223
can "not" substitute a negative independent clause
108376
Best way to "negate" an instanceof
37706
Using "nor" in a list without "neither"
67703
Why does '.sort()' cause the list to be 'None' in Python?