KwickClips Python · 45 sec · free
Why can't you use == to find NaN?
Short answer. Because NaN is not equal to anything, not even itself.
What does notnull() mark as True?
Every cell where a value is present.
Remember
| isnull(): True where missing |
| notnull(): True where present |
You checked for N a N with double equals. It found nothing. Why? N a N never equals itself. Use is null to find gaps. Not null finds real values. Here two are present. Two rules. Is null finds gaps. Not null finds values.
This clip is from the full lesson: Handling Missing Values in Pandas — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 12 Artificial Intelligence (843)
More KwickClips from this lesson
What does NaN stand for?41 sec
What does dropna() remove?43 sec
When should you drop a whole column?43 secVoice-over is AI-generated; the script is written and checked by Kajal Ma'am. Confirm anything you plan around against your official board document. We never ask for a password or an OTP.