Posted by - Dictionary
- Dictionary Operations
- Dictionary Functions
- Dictionary Methods
1.Dictionary
Creating a dictionary is as simple as placing items inside curly braces {} separated by commas.An item has a key and a corresponding value that is expressed as a pair (key: value).While the values can be of any data type and can repeat, keys must be of immutable type (string, number or tuple with immutable elements) and must be unique.
- Keys
- Unique – No dup..
- Immutable data type
- Strings
- Numbers
- Tuples
- One entry per key
- For multiple assignments last assignment wins
- On multiple occurrence of Key Python removes old Key by default
- Values
- May be unique
- Any type
- {.:.,.:.,.:.}
- {‘Key’:’Value’}
2.Dictionary Operations
- D = {.,Key_x:Value_y,.}
- D[K] : ← V(K)
- D[K] = V : D ← D[K:V]
- del D[K] : D ← rmv_D[K:V]
- D.clear() : D ← clr_D
- del D : ← del_D
3.Dictionary Functions
- len(D) : D_len
4.Dictionary Methods
- D.copy()
- D.fromkeys(K, /v)
- D.get(k, /s)
- D.items()
- D.keys()
- D.values()
- D.setdefault(kx, /s)
- D.update(F)
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