Lernen Introduction to if-elif-else Statement | Python if-elif-else Statement

Let's begin by examining an example that will aid in a better understanding of the if-elif-else statement.

Here is an example where we check the age for several conditions.

Example 1:


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age = 10

if age < 0:
    print('Age cannot be negative')
if age >= 18:
    print('Adult')
if age < 18 and age >= 10:
    print('Teenager')
if age < 10 and age >= 1:
    print('Child')
if age < 1 and age > 0:
    print('Baby')

If you need to execute one command from several options based on a condition, you can utilize the elif construct.

You can also include an else statement at the end, which will be executed if none of the preceding conditions are satisfied.

Let's consider the following illustration:

So let's rewrite the example above with the new elif statement.

Example 2:


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age = 10

if age < 0:
    print('Age cannot be negative')
elif age >= 18:
    print('Adult')
elif age >= 10:
    print('Teenager')
elif age >= 1:
    print('Child')
else:
    print('Baby')

Clearly, the new operator works smoothly as intended.

Aufgabe

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Now you can write the program which can determine the shape of the figure on the number of angles. Use the if-elif-else construction to solve this task.

We have the following classification:

0 angles -> Circle or ellipse;
3 angles -> Triangle;
4 angles -> Square, rectangle, or rhombus;
more than 4 angles -> Polygon;
in other cases -> It is not a geometric figure.

Please, fill in the gaps.

Lösung

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