KwickClips Python · 39 sec · free
What does the lambda do in filter()?
Short answer. It returns True or False, and only True items are kept.
Do map and filter give lists?
No, wrap them in list(). sorted gives a new list.
Three best friends
| Function | lambda gives | Example |
|---|---|---|
| sorted(key=) | sort-by value | lambda s: s[1] |
| map() | new value | lambda m: m+5 |
| filter() | True or False | lambda m:m>=33 |
Remember
| Wrap map and filter in list() |
| sorted gives a new list |
Where are tiny lambdas useful? With sorted, the lambda picks the sort value. With map, it gives each mark m a new value. With filter, True keeps marks of thirty three or more. Wrap map and filter in list. Sorted gives a new list.
This clip is from the full lesson: Lambda Functions — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: Programming All levels Python, Programming All levels C++
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