So we've seen the list of callers, the location of the assertion of the program, and the failing assertion itself.

The assertion cannot fail.

There is identification the built in assertion typically tells you which assertion failed.

Therefore, the assertion would fail.

Therefore, the assertion would hold.

The assertion in the end passes.

This is coming from the assertion.

So here's the anti traceback we get the assertion error, we get the assertion that failed.

Such a functionality of assertion is available in all programming languages.

Certainly you have made an abominable assertion

At the end, we have an assertion.

Why does the assertion above it failed.

So now here we have the correct assertion.

Generally speaking, if anything in your assertion has side effects such as this one, don't put it into the assertion.

The location of the assertion in the program. In our case, line 1.

The assertion has failed, and the assertion fails precisely on our buggy input, double quote followed by a less than sign.

What you do instead is you put the functionality into code that is outside of the assertion and then use the assertion only for checking the result.

Nobody will believe his assertion that he is innocent.

Do you feel the boredom contained in this assertion?

Here as well, a simple assertion would have sufficed to catch the error, mainly an assertion that checks for the non existence of HTML tags in the output.

Here's our program, the assertion included, with our input as before and if tag should be set somewhere during the execution of this program, then the assertion should fail.

It is important to note that his assertion is groundless.

That is, the opening tag was probably stripped, and of course, the assertion didn't fire.

But, then again, if your program crashes because of a failing assertion, what's the alternative?

I'm sure of the fact.

As a matter of fact...

As a matter of fact,

This is the input which should cause the assertion to fail, press and run, and as you can see down here, the assertion actually failed.

If the condition is false, then we raise an assertion error.

Indeed, with this fix applied, the assertion can no longer fail.

Since the markup characters are being added, the assertion finally fails.

So which information does one get from a failing Python assertion.

But how many of you would be able to make a confident assertion about a piece of classical music?

This fact is of little consequence.

He was ignorant of the fact.

He professes ignorance of the fact.

I am aware of the fact.

I was aware of that fact.

In fact, hundreds of years ago,

In fact, most of my career,

Well, all of them, in fact.

Yes, as a matter of fact.

One of the first, in fact.

As a matter of fact, yes.

That... on top of the fact,