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:

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


              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:

# This will raise an IndexError

string = "codefinity"

print(string[10])


              123
            
# This will raise an IndexError
string = "codefinity"
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.

Aufgabe

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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.

Lösung

first_name = "Michael"

last_name = "Johnson"

# Get the first letters of each name

initial1 = first_name[0]

initial2 = last_name[0]

dot = "."

# Print the result

print("Expected: M.J.")

print("Result :", f"{initial1}{dot}{initial2}{dot}")

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Abschnitt 3. Kapitel 3

first_name = "Michael"

last_name = "Johnson"

# Get the first letters of each name

initial1 = ___[___]

initial2 = ___[___]

dot = ___

# Print the result

print("Expected: M.J.")

print("Result :", f"{initial1}{dot}{initial2}{dot}")

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