How to easily manually raise an AssertionError in Python.
Option 1 (The long way), useful if you then want to do something else if the condition is not met:
x = 10
if x != 10:
raise AssertionError("ERROR: x is not 10")
else:
print("OK: x is 10")
Option 2 (The stricter easy way), good for checking 1 condition:
assert x == 10, "ERROR: x is not 10"