Booleans

Description

Programs often rely on conditional logic, such as if statements. To control these functions, there is a special data type, called boolean (abbreviated to bool in Python) which may have only one of two values, true or false. A basic boolean is generated by comparing two values or objects using one of 8 comparators:

  • $>$ is >
  • $<$ is <
  • $\geq$ is >=
  • $\leq$ is <=
  • $=$ is ==
  • $\neq$ is !=
  • is tests if two items reference the same object
  • is not does the same, but is inverted, similar to == and !=

The is and is not comparators are not often used in the basic Python programming usually seen in Sage, but are included just in case.

Sage Cell

Code

print 5 > 3
print 5 < 3
print 5 >= 3
print 5 <= 3
print 5 == 3
print 5 != 3

Boolean Operators

If we want a single boolean value based on multiple conditions, we use one or more of the 3 boolean operators. These operators are

  • and: the statement is true if all components are true
  • or: the statement is true if one or more components are true
  • not: this inverts a statement or component. For example, if a is false, not a is true.

The operators are listed in ascending priority, meaning Sage will evaluate all or operations, then all and operations, then all not operations. All 3 operators have lower priority than the 8 comparators listed above.

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Date: 31 Mar 2019 00:14

Submitted by: Zane Corbiere

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