String Indexing in Python

String indexing allows you to access individual characters of a string using their position, or index.

Indexing in Python starts from 0. That means the first character of any string has index 0, the second character has index 1, and so on.

For example, in the word "codefinity":

To access a character by index, use square brackets [] with the index number inside:


              12345
            
string = "codefinity"

print("Print the c symbol:", string[0])  # First character
print("Print the o symbol:", string[1])  # Second character
print("Print the y symbol:", string[9])  # Last character

Index Out of Range

If you try to access a character at an index that does not exist, Python will raise an error:


              12
            
# This will raise an IndexError
print(string[10])

This is called an "index out of range" error. In the word "codefinity", valid indexes are from 0 to 9, because it has 10 characters in total.

Opgave

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In accounting systems, initials are often used instead of full names when generating reports or signatures.

You are given the variables first_name and last_name, which store a person’s name.

Use string indexing only to extract the first letters from each name and display them in the format: M.J.

Løsning

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Sektion 3. Kapitel 3

String Indexing in Python

String indexing allows you to access individual characters of a string using their position, or index.

Indexing in Python starts from 0. That means the first character of any string has index 0, the second character has index 1, and so on.

For example, in the word "codefinity":

To access a character by index, use square brackets [] with the index number inside:


              12345
            
string = "codefinity"

print("Print the c symbol:", string[0])  # First character
print("Print the o symbol:", string[1])  # Second character
print("Print the y symbol:", string[9])  # Last character

Index Out of Range

If you try to access a character at an index that does not exist, Python will raise an error:


              12
            
# This will raise an IndexError
print(string[10])

This is called an "index out of range" error. In the word "codefinity", valid indexes are from 0 to 9, because it has 10 characters in total.

Opgave

Swipe to start coding

In accounting systems, initials are often used instead of full names when generating reports or signatures.

You are given the variables first_name and last_name, which store a person’s name.

Use string indexing only to extract the first letters from each name and display them in the format: M.J.

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 3

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