Python Code Samples · PythonSkillset

Strings & text

Format, split, join, and clean Python strings — the bread and butter of everyday scripts.

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F-string formatting

Embed variables and expressions inside readable f-strings.

name = "Ada"
score = 97.5
label = f"{name} scored {score:.1f}%"
print(label)
print(f"Next year: {2026 + 1}")

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Strings & text easy

Split and join words

Turn a sentence into tokens, then rebuild it with a custom separator.

strings split join

Python

raw = "python split join example"
words = raw.split()
print(words)

joined = "-".join(words)
print(joined)

csv_line = "red,green,blue"
colors = csv_line.split(",")
print(" | ".join(colors))

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Strings & text easy

Strip and normalize text

Remove stray whitespace and compare user input reliably.

strings strip input

Python

messy = "  Hello, Python!  \n"
clean = messy.strip()
print(repr(clean))

user = "  YES  "
if user.strip().lower() == "yes":
    print("Confirmed")

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Lists & loops

Iterate, transform, and combine sequences with readable Python patterns.

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Lists & loops medium

List comprehension filter

Build a new list in one line by filtering and transforming items.

lists comprehension filter

Python

numbers = [1, 2, 3, 4, 5, 6, 7, 8]
doubled_evens = [n * 2 for n in numbers if n % 2 == 0]
print(doubled_evens)

names = ["ada", "linus", "guido"]
title_case = [name.title() for name in names if name]
print(title_case)

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Lists & loops easy

Enumerate with index

Loop with both index and value — cleaner than manual counters.

loops enumerate lists

Python

tasks = ["read docs", "write code", "run tests"]

for i, task in enumerate(tasks, start=1):
    print(f"{i}. {task}")

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Lists & loops easy

Zip two lists

Pair items from parallel lists and iterate them together.

lists zip loops

Python

names = ["Ada", "Grace", "Katherine"]
scores = [98, 95, 100]

for name, score in zip(names, scores):
    print(f"{name}: {score}")

print(list(zip(names, scores)))

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Functions & basics

Small reusable building blocks — parameters, returns, and clear function design.

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Functions & basics easy

Function with default argument

Define a reusable greet helper with an optional prefix parameter.

functions defaults basics

Python

def greet(name, prefix="Hello"):
    return f"{prefix}, {name}!"


print(greet("Python"))
print(greet("World", prefix="Hi"))

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Functions & basics medium

Return multiple values

Return a tuple of results and unpack them at the call site.

functions return tuple

Python

def min_max(values):
    if not values:
        return None, None
    return min(values), max(values)


data = [3, 9, 1, 7]
lo, hi = min_max(data)
print(f"range: {lo} .. {hi}")

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Files & data

Read files safely and parse common data formats without extra dependencies.

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Files & data medium

Read a text file with pathlib

Open and read UTF-8 text using pathlib.Path — modern and portable.

files pathlib io

Python

from pathlib import Path

path = Path("notes.txt")
if path.is_file():
    text = path.read_text(encoding="utf-8")
    print(text[:200])
else:
    print("File not found — create notes.txt to try this sample.")

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Files & data medium

Parse JSON safely

Load JSON from a string and handle decode errors without crashing.

json parsing stdlib

Python

import json

payload = '{"name": "Ada", "skills": ["Python", "math"]}'

try:
    data = json.loads(payload)
    print(data["name"])
    print(", ".join(data["skills"]))
except json.JSONDecodeError as exc:
    print(f"Invalid JSON: {exc}")

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Errors & debugging

Handle failures gracefully and write clearer error messages for future you.

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Errors & debugging easy

Try/except ValueError

Convert user input to int inside try/except and show a friendly message.

errors try-except input

Python

raw = "42"

try:
    value = int(raw)
    print(f"Parsed: {value}")
except ValueError:
    print(f"Could not parse {raw!r} as an integer.")

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Errors & debugging medium

Raise a clear custom error

Validate input early and raise ValueError with a helpful message.

errors raise validation

Python

def positive_only(n):
    """Return n if it is strictly positive."""
    if n <= 0:
        raise ValueError(f"Expected a positive number, got {n}")
    return n


print(positive_only(5))
try:
    positive_only(-1)
except ValueError as exc:
    print(exc)

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