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Practice

Which values are always considered False?

Certain values like 0 and empty strings ("") are automatically considered False in conditional statements.

These values can be used to control program flow—for example, when the result of an arithmetic operation is 0.

Examples of values evaluated as False
a = 2
b = 3

if a - b:
    print("a - b is not 0.")
else:
    print("a - b is 0.")

What values are always evaluated as False?​

  • Numeric 0 (integer 0, float 0.0)

  • Empty string ""

  • Empty list [], empty tuple (), empty dictionary {}

  • None


Using conditionals​

When these values are passed to an if statement, the condition is evaluated as False and the block of code does not execute.

Examples of values evaluated as False
if 0:
    print("This will not execute.")
else:
    print("0 is evaluated as False.")


if "":
    print("This will not execute.")
else:
    print("An empty string is evaluated as False.")

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