KwickClips Python · 44 sec · free
How does Python know whether to add or change?
Short answer. It checks the key. An existing key changes; a new key adds a pair.
How do you delete a pair?
del menu[key].
Remember
| menu[key] reads a value |
| Old key: value changes |
| New key: pair is added |
| del removes a pair |
Add and change use one line. How? It checks the key. Tea exists, so its value changes. Idli is new, so a pair is added. Del removes poha. Brackets read a value. An old key changes. A new key adds a pair. Del removes one.
This clip is from the full lesson: Dictionaries: Key-Value Pairs, Methods and Programs — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 10 Artificial Intelligence (417), CBSE Class 11 Computer Science (083), CBSE Class 11 Computer Science (083), CBSE Class 11 Computer Science Essentials (083)
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![Code with menu = {tea: 10, poha: 25} printing menu[poha] as 25.](/images/learn/clips/PY17-R1.webp)
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