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Variables

Python Variables and Assignments

TermDefinition
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