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Variables
Python Variables and Assignments
| Term | Definition |
|---|---|
| variable assignment | <variable> = <expression> <expression> right of the = assignment operator is evaluated resulting value is stored in an object of the appropriate type object is assigned to <variable> variable refers to object or is bound to the object |
| reassignment of variable | Subsequent assignments to a, such as >>> a = 6 will reuse the existing name a. The result of this assignment is that variable 'a' will refer to another object, integer object 6. |
| immutable | a = 6 does not change integer object 3. New integer object 6 is created, and variable 'a' now refers to it. Cannot change value of 3. All Python number types (bool, int, float, and complex) and strings cannot be changed |
| mutable | list object can change. For example: >>> d = [2, 3, 5, 8, 11] >>> d[3] = 7 >>> d [2, 3, 5, 7, 11] |
| swapping | >>> a = 6 >>> b = 3 >>> a, b = b, a >>> a 3 >>> b 6 |
| passing reference to immutable object in parameter call | a = 3 def g(x): x=5 g(a) a=5 a = 3 in the context of g(a), a = 5 in the larger program interactive shell a=3 function cannot reassign a to int object 5 |
| passing reference to mutable object in parameter call | Functions can modify mutable arguments. like lists |
Created by:
kbaldwin
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