PYTHON CORE · LESSON 34

When the mistake happened.

try and except · about 13 minutes

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STEP 1

Try and do it.

In try put an action that can end in error. For example, a word cannot be turned into a number.

try:
    number = int("кот")

What happens when you make a mistake

trytryMistakenumberlessexceptexplanation

✦ Without processing there would be an error.

STEP 2

except ValueError will work if the text is not converted to a number.

try:
    number = int("кот")
except ValueError:
    print("Это не число")

✦ Now the program will explain the problem calmly.

IN-CLASS PRACTICE

Dial the error handling unit. Check the indentations.

try:
    number = int("abc")
except ValueError:
    print("Не число")

HOMEWORK

Try turning the word «кот» into a number inside try. In except ValueError, output «Не число». Name the variable number.

The answer is hidden. Use similar examples from the lesson notes.