Official Documentation
- Dictionaries associates keys with values
- Keys must be immutable (e.g. no lists, but tuples are ok)
# Literal
d = { key1 => value1, key2 => value2 }
# From list of pairs
d = dict([ (key1, value1), (key2, value2) ])
| Syntax |
Semantics |
xs[k] |
Read value associated with k |
xs[k] = v |
Add/overwrite value associated with k |
len(d) |
Number of key/value pairs in d |
d.keys() |
List of keys |
d.values() |
List of values |
d.items() |
Sequence of key/value pairs |
del(d[k]) |
Removes key/value pair whose key is k |
d.clear() |
Empty dictionary |
d.copy() |
Make a copy |
k in d |
Checks if k is a key in d |