Python · Theory

Assert

Theory

91/268

Assert

assert condition, "msg" checks a belief while developing. If False, AssertionError. Good for internal checks, not for user input validation in production (can be disabled with python -O).

Example — assert marks >= 0. If marks is -5, the script stops with a clear message.

Output — ok 72. If marks were -5, AssertionError. python -O can skip asserts.

Exam tip

What assert does + python -O warning.

Example

# Assert
marks = 72
assert marks >= 0, "marks cannot be negative"
print("ok", marks)

Output: ok 72. If marks were -5, AssertionError. python -O can skip asserts.

Short notes

Defassert checks a condition.
RuleFalse → AssertionError.
TrapDon’t use assert as the only user-input check in production.

Python · Theory

Assert

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Theory

91/268

Assert

assert condition, "msg" checks a belief while developing. If False, AssertionError. Good for internal checks, not for user input validation in production (can be disabled with python -O).

Example — assert marks >= 0. If marks is -5, the script stops with a clear message.

Output — ok 72. If marks were -5, AssertionError. python -O can skip asserts.

Exam tip

What assert does + python -O warning.

Example

# Assert
marks = 72
assert marks >= 0, "marks cannot be negative"
print("ok", marks)

Output: ok 72. If marks were -5, AssertionError. python -O can skip asserts.

Short notes

Defassert checks a condition.
RuleFalse → AssertionError.
TrapDon’t use assert as the only user-input check in production.

Assert

Example

Short notes

Questions

Assert

Example

Short notes

Questions