Booleans represent one of two values: True or False. In Python you can evaluate any expression to determine whether it is True or False.

print(3 > 1) #returns True
print(3 == 1) #returns False
print(3 < 1) #returns False

a = 3
b = 1

if b > a:
    print("b is greater than a.")
else:
    print("b is not greater than a.")

Output

b is not greater than a.

Almost any value is evaluated to True if it has some sort of content.

• Any string is True, except empty strings
• Any number is True, except 0
• Any list, tuple, set, and dictionary are True, except empty ones

All of the following will return True.

bool("xyz")
bool(123)
bool(["Ferrari", "Maserati", "Alfa Romeo"])

There are not many values that evaluate to False, except empty values, such as (), [], {}, “”, the number 0, and the value None or False.

All of the following will return False.

bool(False)
bool(None)
bool(0)
bool("")
bool(())
bool([])
bool({})

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