Slicing Task

Slicing can be enhanced with a step argument, which allows you to extract characters at specific intervals.

This is useful when you want to select every second character, skip letters, or extract patterns from structured data like invoice numbers, transaction codes, or reports.

python

start: the index where slicing begins (inclusive)
end: the index where slicing ends (exclusive)
step: the interval (e.g., 2 means every second character)

Example


              123
            
code = "TXN-2024-INV-0007"
sliced = code[0:13:5]
print(sliced)  # Output: T0N

We start at index 0
End at index 13 (exclusive)
Use a step of 5, which means: take every fifth character

Characters at indexes 0, 5, and 10 are 'T', '2', and 'I', so the output is 'T0N'.

This kind of slicing could be used to extract initials or control codes from structured strings in financial or document systems.

Task

Swipe to start coding

In an accounting system, filenames for financial reports are generated automatically. Each filename includes a prefix, the report type, and the year.

Your task is to use slicing with a step to extract the 1st and 3rd digits of the year (in this case, 2 and 2) from the filename. This result will serve as a simple year control code.

Solution

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Section 3. Chapter 7

Slicing Task

Slicing can be enhanced with a step argument, which allows you to extract characters at specific intervals.

This is useful when you want to select every second character, skip letters, or extract patterns from structured data like invoice numbers, transaction codes, or reports.

python

start: the index where slicing begins (inclusive)
end: the index where slicing ends (exclusive)
step: the interval (e.g., 2 means every second character)

Example


              123
            
code = "TXN-2024-INV-0007"
sliced = code[0:13:5]
print(sliced)  # Output: T0N

We start at index 0
End at index 13 (exclusive)
Use a step of 5, which means: take every fifth character

Characters at indexes 0, 5, and 10 are 'T', '2', and 'I', so the output is 'T0N'.

This kind of slicing could be used to extract initials or control codes from structured strings in financial or document systems.

Task

Swipe to start coding

In an accounting system, filenames for financial reports are generated automatically. Each filename includes a prefix, the report type, and the year.

Your task is to use slicing with a step to extract the 1st and 3rd digits of the year (in this case, 2 and 2) from the filename. This result will serve as a simple year control code.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 7

Switch to desktop for real-world practiceContinue from where you are using one of the options below