Boolean operators

Intermediate Python for Finance

Kennedy Behrman

Data Engineer, Author, Founder

Boolean logic

What are Boolean operations?

1. and
2. or
3. not

Object evaluation

Evaluates as False

• Constants:

  • False
  • None

• Numeric zero:

  • 0
  • 0.0

• Length of zero

  • ""
  • []
  • {}

Evaluates as True

• Almost everything else

The AND operator

True and True

True

True and False

False

The OR operator

False or True

True

True or True

True

False or False

False

Short circuit.

is_current() and is_investment()

False

is_current() or is_investment()

True

The NOT operator

not True

False

not False

True

Order of operations with NOT

True == False

False

not True == False

True

Object evaluation

"CUSIP" and True

True

Object evaluation

[] or False

False

Object evaluation

not {}

True

Returning objects

"Federal" and "State"

"State"

[] and "State"

[]

Returning objects.

13 or "account number"

13

0.0 or {"balance": 2200}

{"balance": 2200}

Let's practice!

Intermediate Python for Finance