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Combining conditions

Often we need to check if multiple conditions hold, and only then decide to continue or not. In boolean algebra, there are two common operators: OR and AND. What do they do?

Operator OR checks if at least one condition holds (i.e. is True) and returns True in that case; otherwise - False.
Operator AND checks if all the conditions hold and returns True in that case; otherwise - False.

For example, imagine that you decide whether go outside or not. If there is good weather AND today is Saturday/Sunday, then you can go; otherwise - not. Here we check if both conditions hold, and only in case when all are True, we will go outside.

In Python, you can use the same words but in lowercase, i.e. condition1 or condition2, condition1, and conditon2. Also, you can combine multiple ands and ors. Parentheses are common there.

For example, let's check the following conditions:

If 2 greater than 1 and "bbb" greater than "aaa"
If the second index symbol in the string "my string" equals "y" or "s"


              1234
            
# check the first two conditions
print(2 > 1 and "bbb" > "aaa")
# check the next two conditions
print("my string"[2] == "y" or "my string"[2] == "s")

Opgave

Swipe to start coding

Given variable t with some string assigned to it. Check the following conditions: if number of characters in this string is less than 15 and number of letter 'n' in this string greater than 2
Given numerical variable a. You need to check if this variable is greater than 9475/37 or the remainder of the division by 14 is less than 7.

Løsning

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Sektion 4. Kapitel 2

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Combining conditions

Often we need to check if multiple conditions hold, and only then decide to continue or not. In boolean algebra, there are two common operators: OR and AND. What do they do?

In Python, you can use the same words but in lowercase, i.e. condition1 or condition2, condition1, and conditon2. Also, you can combine multiple ands and ors. Parentheses are common there.

For example, let's check the following conditions:

If 2 greater than 1 and "bbb" greater than "aaa"
If the second index symbol in the string "my string" equals "y" or "s"


              1234
            
# check the first two conditions
print(2 > 1 and "bbb" > "aaa")
# check the next two conditions
print("my string"[2] == "y" or "my string"[2] == "s")

Opgave

Swipe to start coding

Given variable t with some string assigned to it. Check the following conditions: if number of characters in this string is less than 15 and number of letter 'n' in this string greater than 2
Given numerical variable a. You need to check if this variable is greater than 9475/37 or the remainder of the division by 14 is less than 7.

Løsning

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 4. Kapitel 2

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder