2.10: Glossary
- Page ID
- 17032
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- dictionary:
- A mapping from a set of keys to their corresponding values.
- key-value pair:
- The representation of the mapping from a key to a value.
- item:
- Another name for a key-value pair.
- key:
- An object that appears in a dictionary as the first part of a key-value pair.
- value:
- An object that appears in a dictionary as the second part of a key-value pair. This is more specific than our previous use of the word “value.”
- implementation:
- A way of performing a computation.
- hashtable:
- The algorithm used to implement Python dictionaries.
- hash function:
- A function used by a hashtable to compute the location for a key.
- hashable:
- A type that has a hash function. Immutable types like integers, floats and strings are hashable; mutable types like lists and dictionaries are not.
- lookup:
- A dictionary operation that takes a key and finds the corresponding value.
- reverse lookup:
- A dictionary operation that takes a value and finds one or more keys that map to it.
- singleton:
- A list (or other sequence) with a single element.
- call graph:
- A diagram that shows every frame created during the execution of a program, with an arrow from each caller to each callee.
- histogram:
- A set of counters.
- memo:
- A computed value stored to avoid unnecessary future computation.
- global variable:
- A variable defined outside a function. Global variables can be accessed from any function.
- flag:
- A boolean variable used to indicate whether a condition is true.
- declaration:
- A statement like
global
that tells the interpreter something about a variable.