How to change the message in a Python AssertionError?

Question

I\'m writing per the following, in which I try to produce a decent error message when comparing two multiline blocks of Unicode text. The interior method that does the compa

Answer 1

assert expression, info

For instance,

>>> assert False, "Oopsie"
Traceback (most recent call last):
  File "", line 1, in 
AssertionError: Oopsie

---

From the docs:

Assert statements are a convenient way to insert debugging assertions into a program:

assert_stmt ::=  "assert" expression
["," expression] 

The simple form, assert expression, is equivalent to

if __debug__:
    if not expression:
        raise AssertionError 

The extended form

assert expression1, expression2

is equivalent to

if __debug__:
    if not expression1:
        raise AssertionError(expression2)

These equivalences assume that __debug__ and AssertionError refer to the built-in variables with those names. In the current implementation, the built-in variable __debug__ is True under normal circumstances, False when optimization is requested (command line option -O). The current code generator emits no code for an assert statement when optimization is requested at compile time. Note that it is unnecessary to include the source code for the expression that failed in the error message; it will be displayed as part of the stack trace.