8. Boolean Variables

• We can store true and false

• Variables of this type are called logical or boolean

• In Python, we can initialize variables of this type with True or False

• Note that the T and F are capitalized, any other form generates a syntax error

8.1. Relational Operators

Relational Operators

Operator	Operation	Mathematical equivalent symbol
==	equal	=
>	greater than	>
<	less than	<
!=	not equal	<>
>=	greater or equal	>=
<=	less or equal	<=

• Note that the equality operator is two equals (==)

8.2. Examples:

1 a = 1 2 b = 5 3 c = 2 4 d = 1 5 print(a == b) 6 print(b > a) 7 print(a < b) 8 print(a == d) 9 print(b >= a) 10 print(c <= b) 11 print(d != a) 12 print(d != b) Edit this code line that just executed next line to execute << First < Prev Next > Last >> Step 1 of 12 Submit Python Tutor by Philip Guo Customize visualization (NEW!)

Print output (drag lower right corner to resize) Frames Global frame Objects

Activity: CodeLens 8.2.1 (cl_l05_8a_en)

8.3. Important Example

• >= or <= for equal values

1 print(5 >= 5) 2 print(5 <= 5) Edit this code line that just executed next line to execute << First < Prev Next > Last >> Step 1 of 2 Submit Python Tutor by Philip Guo Customize visualization (NEW!)

Print output (drag lower right corner to resize) Frames Global frame Objects

Activity: CodeLens 8.3.1 (cl_l05_8b_en)

8.4. Example

• We can use relational operators to initialize logical variables

1 grade = 8 2 average = 6 3 passed = grade > average 4 print(passed) Edit this code line that just executed next line to execute << First < Prev Next > Last >> Step 1 of 4 Submit Python Tutor by Philip Guo Customize visualization (NEW!)

Print output (drag lower right corner to resize) Frames Global frame Objects

Activity: CodeLens 8.4.1 (cl_l05_8c_en)

You have attempted 1 of 2 activities on this page