This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
Operations on Dictionaries
Dictionaries provide a mapping between names and objects. You can apply the following operations to dictionaries:
|
Operation |
Description |
|
x = d[k] |
Indexing by key |
|
d[k] = x |
Assignment by key |
|
del d[k] |
Deletes an item by key |
|
len(d) |
Number of items in the dictionary |
Key values can be any immutable object, such as strings, numbers, and tuples. In addition, dictionary keys can be specified as a comma-separated list of values, like this:
d = { }
d[1,2,3] = "foo"
d[1,0,3] = "bar"
In this case, the key values represent a tuple, making the preceding assignments identical to the following:
d[(1,2,3)] = "foo" d[(1,0,3)] = "bar"