Reference library
Python code samples
Copy-ready Python snippets by topic and difficulty — short, focused, and runnable in the browser editor.
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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")
2
0
Open
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.")
3
0
Open
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)
3
1
Open
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