Negative Indexation

You can access characters in a string using negative indexing, which starts from the end of the string.

This is especially useful when you want to get the last character or work backwards, without manually counting the total length of the string.

Syntax

python

Negative indexing starts at -1. string[-1] returns the last character, string[-2] returns the second-to-last, and so on. string[-0] is the same as string[0] (first character), so it's rarely used.

Example


              123
            
document = "Invoice #34567"
last_char = document[-1]
print(last_char)  # Output: 7

In this case, we don't need to count the total number of characters to find the last one. We simply use -1 to get the final digit of the invoice number.

Opgave

Swipe to start coding

You are working with a financial record string. Use negative indexing to extract:

The last character of the string;
The second-to-last character.

Assign them to the variables last_char and second_last_char, respectively.

Løsning

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Var alt klart?

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Sektion 3. Kapitel 5

Negative Indexation

You can access characters in a string using negative indexing, which starts from the end of the string.

This is especially useful when you want to get the last character or work backwards, without manually counting the total length of the string.

Syntax

python

Example


              123
            
document = "Invoice #34567"
last_char = document[-1]
print(last_char)  # Output: 7

In this case, we don't need to count the total number of characters to find the last one. We simply use -1 to get the final digit of the invoice number.

Opgave

Swipe to start coding

You are working with a financial record string. Use negative indexing to extract:

The last character of the string;
The second-to-last character.

Assign them to the variables last_char and second_last_char, respectively.

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 3. Kapitel 5

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