Chapter 002 / 132 · Level 0 · Computer and logic foundations

Files folders and paths

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Chapter 2 of 132 · Level 0 · Computer and logic foundations · Python demonstrations with recorded outputs. Learn through reading, predicting and testing real Python code.

Code + real outputPractice + explanationsOffline Python exercises

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01 · Why this concept matters

A path names a location in a filesystem. The slash operator combines path components without manually inserting separators. PurePath works without creating any folders.

Learning goal: Files folders and paths. Start by reading what the program does, then inspect its exact output. Where an example illustrates only a prerequisite, study the named advanced feature separately before using it in production.

02 · The important subtopics

Study these connected ideas as you work through the demonstration:

File extensions and hidden files
Relative and absolute paths
Reading folders and moving files safely
Backups naming and versioned work

03 · Pinpoint: read the code line by line

Line 1from pathlib import PurePathDefine or import. Notice what values enter this statement and which names it affects.
Line 2path = PurePath('courses') / 'python' / 'lesson01.py'Create, update, or use a value. Notice what values enter this statement and which names it affects.
Line 3print(path.parts)Display a result. Notice what values enter this statement and which names it affects.
Line 4print(path.suffix)Display a result. Notice what values enter this statement and which names it affects.

Input → operation → output

Find the literal input values and arguments, follow each operation in execution order, and verify the result below. This habit turns a code listing into a testable explanation.

04 · Runnable Python example and verified output

Files folders and paths: working demonstration

Python · runnable

PYTHON CODE

from pathlib import PurePath
path = PurePath('courses') / 'python' / 'lesson01.py'
print(path.parts)
print(path.suffix)

Verified execution ▼

('courses', 'python', 'lesson01.py')
.py

Why it works: A path names a location in a filesystem. The slash operator combines path components without manually inserting separators. PurePath works without creating any folders.

Worked example 2 · Files Folders And Paths in practice

Python · executed and checked

PYTHON CODE

from pathlib import PurePath
p = PurePath('courses') / 'python' / 'ch-1.html'
print('Name:', p.name)
print('Parent:', p.parent)

Verified execution output

Name: ch-1.html
Parent: courses/python

Pinpoint learning: This practical files folders and paths demonstration uses a small input you can inspect. Run it exactly as shown, compare the displayed result, then change one value and predict how the result will change.

Understand the code line by line

1: from pathlib import PurePath — Load a standard-library feature needed by the example.
2: p = PurePath('courses') / 'python' / 'ch-1.html' — Store or update the value on the left using the expression on the right.
3: print('Name:', p.name) — Display the value so you can compare it with the verified output.
4: print('Parent:', p.parent) — Display the value so you can compare it with the verified output.

Worked example 3 · Change one input and compare

Python · executed and checked

PYTHON CODE

from pathlib import PurePath
p = PurePath('courses!') / 'python' / 'ch-1.html'
print('Name:', p.name)
print('Parent:', p.parent)

Verified execution output

Name: ch-1.html
Parent: courses!/python

Pinpoint learning: Exactly one literal input was changed from the preceding demonstration. Compare the outputs: identify the modified value, trace the operation, and explain which result changed. The displayed output was produced by executing this variant.

Understand the code line by line

1: from pathlib import PurePath — Load a standard-library feature needed by the example.
2: p = PurePath('courses!') / 'python' / 'ch-1.html' — Store or update the value on the left using the expression on the right.
3: print('Name:', p.name) — Display the value so you can compare it with the verified output.
4: print('Parent:', p.parent) — Display the value so you can compare it with the verified output.

05 · Independent practice and answer guidance

Exercise A · Adapt the code

Sketch a directory with projects, notes, and a practice.py file; identify its relative path.

Exercise B · Predict

Before pressing Run, predict the first displayed line. Next, change one literal value and record the new observed output. Explain the difference in one clear sentence.

Exercise C · Debug

Make a temporary invalid change, read the exception or failed assertion if one occurs, restore the working code, and explain the repair.

Worked explanation for the original example

A path names a location in a filesystem. The slash operator combines path components without manually inserting separators. PurePath works without creating any folders.

('courses', 'python', 'lesson01.py')
.py

06 · Build, verify and advance

Real-world task: Create a clean study directory with a project folder and backup copy.

Mastery checklist

Run the original code; explain the important lines; change one input and verify the new outcome; use a test or recorded result to justify your conclusion.