Booleans If Loops Lambda Functions
Booleans
If
Loops
Lambda
Functions
Logical and Function Constructions
K. Cooper1
1Department of Mathematics Washington State University
2021
Cooper Logic/Functions
Washington State University
Booleans
If
Loops
Lambda
Functions
Boolean Values
Many languages (including) Python use Boolean values: True/False.
The invocation of Boole's name always carries an identification of "True" with 1, False with 0. This is binary ? computers are good at that. Thus, computers can carry out actions based on simple decisions.
In most computer languages, 0 represents "False"; any other number is actually interpreted as "True" ? not just 1.
Cooper Logic/Functions
Washington State University
Booleans
If
Loops
Lambda
Functions
Logical Operators
x=2 print(x==2) results in True.
Remember that = denotes assignment: evaluate the expression on the right and put that value in the variable named on the left. The symbol == is a binary test: it asks the for the truth value of the statement, "the thing on the left is the same as the thing on the right."
dog = 'cat' print(dog=='cat') produces True.
Cooper Logic/Functions
Washington State University
Booleans
If
Loops
Lambda
Functions
Logical Operators
The test for equality is just one of many possibilities.
Symbol == != < > =
Test equal to not equal to less than greater than less than or equal to greater than or equal to
There are also the usual conjunctions, and and or. Use lots of parentheses when you use and or or.
Cooper Logic/Functions
Washington State University
Booleans
If
Loops
Lambda
Functions
Bitwise Logicals
and and or test whether numbers are zero or nonzero. There are other operators that look familiar that actually do Boolean logic on binary representations of integers.
Symbol & | ^
Test bitwise and bitwise or bitwise xor
6
&
7
0110 0111
6
8
&
7
1000 0111
0
6
|
7
0110 0111
7
8
|
7
1000 0111
15
Cooper Logic/Functions
Washington State University
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