Home|About|Gaming cabinet|Archives|How it works|Starter sites

GeezerVison is showing www.w3schools.com — Python warnings Module

Search field

×

W3Schools app iOS & Android Start the adventure

Sign In

★ +1 Spaces Upgrade Paid Courses Spaces Upgrade Paid Courses

❮

❯

HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP C C++ C# AWS W3.CSS HOW TO BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS DSA TYPESCRIPT ANGULAR ANGULARJS GIT POSTGRESQL MONGODB ASP AI R GO KOTLIN SWIFT SASS VUE GEN AI SCIPY CYBERSECURITY DATA SCIENCE INTRO TO PROGRAMMING INTRO TO HTML & CSS BASH RUST TOOLS

Python Tutorial

Python HOME Python Intro Python Get Started Python Syntax

Syntax Statements Code Challenge

Print Text Print Numbers Code Challenge

Python Comments

Comments Code Challenge

Python Variables

Python Variables Variable Names Assign Multiple Values Output Variables Global Variables Variable Exercises Code Challenge

Python Data Types

Data Types Code Challenge

Numbers Code Challenge

Casting Code Challenge

Python Strings Slicing Strings Modify Strings Concatenate Strings Format Strings Escape Characters String Methods String Exercises Code Challenge

Python Booleans

Booleans Code Challenge

Python Operators

Python Operators Arithmetic Operators Assignment Operators Ternary Operator Comparison Operators Logical Operators Identity Operators Membership Operators Bitwise Operators Operator Precedence Code Challenge

Python Lists Access List Items Change List Items Add List Items Remove List Items Loop Lists List Comprehension Sort Lists Copy Lists Join Lists List Methods List Exercises Code Challenge

Python Tuples Access Tuples Update Tuples Unpack Tuples Loop Tuples Join Tuples Tuple Methods Tuple Exercises Code Challenge

Python Sets Access Set Items Add Set Items Remove Set Items Loop Sets Join Sets Frozenset Set Methods Set Exercises Code Challenge

Python Dictionaries

Python Dictionaries Access Items Change Items Add Items Remove Items Loop Dictionaries Copy Dictionaries Nested Dictionaries Dictionary Methods Dictionary Exercises Code Challenge

Python If...Else

Python If Python Elif Python Else Shorthand If Logical Operators Nested If Pass Statement Code Challenge

Match Code Challenge

Python While Loops

While Loops Code Challenge

Python For Loops

For Loops Code Challenge

Python Functions

Python Functions Python Arguments Python *args / **kwargs Python Scope Python Decorators Python Lambda Python Recursion Python Generators Code Challenge

Range Code Challenge

Arrays Code Challenge

Python Iterators

Iterators Code Challenge

Modules Code Challenge

Dates Code Challenge

Math Code Challenge

JSON Code Challenge

RegEx Code Challenge

Python PIP Python Try...Except

Try...Except Code Challenge

Python String Formatting

String Formatting Code Challenge

None Code Challenge

Python User Input Python VirtualEnv

Python Classes

Python OOP Python Classes/Objects

Classes/Objects Code Challenge

Python __init__ Method

__init__ Method Code Challenge

Python self Parameter

self Parameter Code Challenge

Python Class Properties

Class Properties Code Challenge

Python Class Methods

Class Methods Code Challenge

Python Magic Methods

Magic Methods __str__ __repr__ __eq__ __add__ __len__ __lt__ __contains__ __call__ Code Challenge

Python Inheritance

Inheritance Code Challenge

Python Polymorphism

Polymorphism Code Challenge

Python Encapsulation

Encapsulation Code Challenge

Python Inner Classes

File Handling

Python File Handling Python Read Files Python Write/Create Files Python Delete Files

Python Modules

NumPy Tutorial Pandas Tutorial SciPy Tutorial Django Tutorial

Python Matplotlib

Matplotlib Intro Matplotlib Get Started Matplotlib Pyplot Matplotlib Plotting Matplotlib Markers Matplotlib Line Matplotlib Labels Matplotlib Grid Matplotlib Subplot Matplotlib Scatter Matplotlib Bars Matplotlib Histograms Matplotlib Pie Charts

Machine Learning

Getting Started Mean Median Mode Standard Deviation Percentile Data Distribution Normal Data Distribution Scatter Plot Linear Regression Polynomial Regression Multiple Regression Scale Train/Test Decision Tree Confusion Matrix Hierarchical Clustering Logistic Regression Grid Search Categorical Data K-means Bootstrap Aggregation Cross Validation AUC - ROC Curve K-nearest neighbors

Python DSA

Python DSA Lists and Arrays Stacks Queues Linked Lists Hash Tables Trees Binary Trees Binary Search Trees AVL Trees Graphs Linear Search Binary Search Bubble Sort Selection Sort Insertion Sort Quick Sort Counting Sort Radix Sort Merge Sort

Python MySQL

MySQL Get Started MySQL Create Database MySQL Create Table MySQL Insert MySQL Select MySQL Where MySQL Order By MySQL Delete MySQL Drop Table MySQL Update MySQL Limit MySQL Join

Python MongoDB

MongoDB Get Started MongoDB Create DB MongoDB Collection MongoDB Insert MongoDB Find MongoDB Query MongoDB Sort MongoDB Delete MongoDB Drop Collection MongoDB Update MongoDB Limit

Python Cert

Python Certificate

Python How To

Remove List Duplicates Reverse a String Add Two Numbers

Python Examples

Python Examples Python Videos Python Compiler Python Exercises Python Quiz Python Challenges Python Practice Problems Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Training

Python Reference

Python Overview Python Built-in Functions

abs() all() any() ascii() bin() bool() bytearray() bytes() callable() chr() compile() complex() delattr() dict() dir() divmod() enumerate() eval() exec() filter() float() format() frozenset() getattr() globals() hasattr() hex() id() input() int() isinstance() issubclass() iter() len() list() locals() map() max() memoryview() min() next() object() oct() open() ord() pow() print() range() reversed() round() set() setattr() slice() sorted() str() sum() super() tuple() type() vars() zip()

Python String Methods

capitalize() casefold() center() count() encode() endswith() expandtabs() find() format() format_map() index() isalnum() isalpha() isascii() isdecimal() isdigit() isidentifier() islower() isnumeric() isprintable() isspace() istitle() isupper() join() ljust() lower() lstrip() maketrans() partition() replace() rfind() rindex() rjust() rpartition() rsplit() rstrip() split() splitlines() startswith() strip() swapcase() title() translate() upper() zfill()

Python List Methods

append() clear() copy() count() extend() index() insert() pop() remove() reverse() sort()

Python Dictionary Methods

clear() copy() fromkeys() get() items() keys() pop() popitem() setdefault() update() values()

Python Tuple Methods

count() index()

Python Set Methods

add() clear() copy() difference() difference_update() discard() intersection() intersection_update() isdisjoint() issubset() < issuperset() > pop() remove() symmetric_difference() symmetric_difference_update() union() update()

Python File Methods

close() fileno() flush() isatty() read() readable() readline() readlines() seek() seekable() tell() truncate() writable() write() writelines()

Python Keywords

and as assert async await break case class continue def del elif else except False finally for from global if import in is lambda match None nonlocal not or pass raise return True try while with yield

Python Exceptions

ArithmeticError AssertionError AttributeError Exception EOFError FloatingPointError GeneratorExit ImportError IndentationError IndexError KeyError KeyboardInterrupt LookupError MemoryError NameError NotImplementedError OSError OverflowError ReferenceError RuntimeError StopIteration SyntaxError TabError SystemError SystemExit TypeError UnboundLocalError UnicodeError UnicodeEncodeError UnicodeDecodeError UnicodeTranslateError ValueError ZeroDivisionError

Python Glossary

Module Reference

Built-in Modules

abc aifc argparse array ast asyncio atexit base64 bdb binascii bisect builtins bz2 calendar cgi cgitb cmd code codecs codeop collections colorsys concurrent configparser contextlib contextvars copy copyreg csv ctypes curses dataclasses datetime dbm decimal difflib dis doctest email encodings ensurepip enum errno faulthandler filecmp fileinput fnmatch fractions ftplib functools gc getopt getpass gettext glob graphlib gzip hashlib heapq hmac html http idlelib imaplib imghdr imp importlib inspect io json keyword linecache locale logging lzma mailbox mailcap marshal math mimetypes mmap modulefinder msilib msvcrt multiprocessing netrc nntplib numbers nis ntpath operator optparse os pathlib pdb pickle pickletools pipes pkgutil platform plistlib poplib posix pprint profile pstats pty pyclbr pydoc py_compile queue quopri random re reprlib resource rlcompleter runpy sched secrets select selectors shelve shlex shutil signal site smtplib socket socketserver sqlite3 ssl stat statistics string stringprep struct subprocess sunau symtable sys sysconfig tabnanny tarfile telnetlib tempfile termios test textwrap threading time timeit tkinter token tokenize tomllib trace traceback tracemalloc tty turtle types typing unicodedata unittest urllib uuid venv warnings wave weakref webbrowser wsgiref xdrlib xml xmlrpc zipapp zipfile zipimport zlib zoneinfo

seed() getstate() setstate() getrandbits() randrange() randint() choice() choices() shuffle() sample() random() uniform() triangular()

Requests Module

delete(url, args) get(url, params, args) head(url, args) post(url, data, json, args)

Statistics Module

statistics.harmonic_mean() statistics.mean() statistics.median() statistics.median_grouped() statistics.median_high() statistics.median_low() statistics.mode() statistics.pstdev() statistics.stdev() statistics.pvariance() statistics.variance()

math.acos() math.acosh() math.asin() math.asinh() math.atan() math.atan2() math.atanh() math.ceil() math.comb() math.copysign() math.cos() math.cosh() math.degrees() math.dist() math.erf() math.erfc() math.exp() math.expm1() math.fabs() math.factorial() math.floor() math.fmod() math.frexp() math.fsum() math.gamma() math.gcd() math.hypot() math.isclose() math.isfinite() math.isinf() math.isnan() math.isqrt() math.ldexp() math.lgamma() math.log() math.log10() math.log1p() math.log2() math.perm() math.pow() math.prod() math.radians() math.remainder() math.sin() math.sinh() math.sqrt() math.tan() math.tanh() math.trunc() math.e math.inf math.nan math.pi math.tau

cmath.acos(x) cmath.acosh(x) cmath.asin(x) cmath.asinh(x) cmath.atan(x) cmath.atanh(x) cmath.cos(x) cmath.cosh(x) cmath.exp(x) cmath.isclose() cmath.isfinite(x) cmath.isinf(x) cmath.isnan(x) cmath.log(x[, base]) cmath.log10(x) cmath.phase() cmath.polar() cmath.rect() cmath.sin(x) cmath.sinh(x) cmath.sqrt(x) cmath.tan(x) cmath.tanh(x) cmath.e cmath.inf cmath.infj cmath.nan cmath.nanj cmath.pi cmath.tau

Python warnings Module

❮ Previous Python Module Reference Next ❯

Example

Issue a simple warning message:

import warnings

warnings.warn('This is a warning message')
print('Program continues...')

Try it Yourself »

Share

Definition and Usage

The warnings module allows you to issue warning messages to users and control how warnings are displayed, filtered, or turned into exceptions.

Use it to alert users about deprecated features, potential issues, or non-fatal problems without stopping program execution.

Note: Warnings are typically issued for situations that don't warrant raising an exception but should be brought to the user's attention.

Members

Member	Description
BytesWarning	Warning type shown when mixing bytes and text incorrectly.
catch_warnings()	Context manager to temporarily control warning filters and actions.
DeprecationWarning	Warning type for features that will be removed in future Python versions.
EncodingWarning	Warning type for encoding-related issues (Python 3.10+).
filterwarnings()	Add a rule to decide whether to show, ignore, or raise certain warnings.
formatwarning()	Turn a warning into a text string for display.
FutureWarning	Warning type for code that will behave differently in the future.
ImportWarning	Warning type for suspicious module import operations.
PendingDeprecationWarning	Warning type for features planned for deprecation later.
resetwarnings()	Clear all custom warning filters back to default behavior.
ResourceWarning	Warning type for resource usage problems (unclosed files, etc.).
RuntimeWarning	Warning type for questionable runtime behavior.
showwarning()	The function that actually prints warnings (you can replace it).
simplefilter()	Add a simple filter rule without needing regular expressions.
SyntaxWarning	Warning type for suspicious Python syntax.
UnicodeWarning	Warning type for Unicode encoding and decoding issues.
UserWarning	The default warning type used by warn().
warn()	Show a warning message to the user.
warn_explicit()	Show a warning with complete manual control over all details.
Warning	The base class that all warning types inherit from.
WarningMessage	Holds details about a warning (message, category, filename, etc.).

❮ Previous Python Module Reference Next ❯

Sign in to track progress

W3Schools Full Access - your next career move

This way to the W3Schools Adventure app

Learn more about Adventure Mode›

Free account

Track your progress

XP earned 0 Day streak 0 Spaces 0 League —

Sign in to track progress

New

Learn in Adventure Mode W3Schools Adventure App

Coding fundamentals as bite-sized lessons and challenges.

CONTACT US

×

Contact Sales

If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail:
[email protected]

Report Error

If you want to report an error, or if you want to make a suggestion, send us an e-mail:
[email protected]

Top Tutorials

HTML Tutorial
CSS Tutorial
JavaScript Tutorial
How To Tutorial
SQL Tutorial
Python Tutorial
W3.CSS Tutorial
Bootstrap Tutorial
PHP Tutorial
Java Tutorial
C++ Tutorial
jQuery Tutorial

Top References

HTML Reference
CSS Reference
JavaScript Reference
SQL Reference
Python Reference
W3.CSS Reference
Bootstrap Reference
PHP Reference
HTML Colors
Java Reference
AngularJS Reference
jQuery Reference

Top Examples

HTML Examples
CSS Examples
JavaScript Examples
How To Examples
SQL Examples
Python Examples
W3.CSS Examples
Bootstrap Examples
PHP Examples
Java Examples
XML Examples
jQuery Examples

Get Certified

HTML Certificate
CSS Certificate
JavaScript Certificate
Front End Certificate
SQL Certificate
Python Certificate
PHP Certificate
jQuery Certificate
Java Certificate
C++ Certificate
C# Certificate
XML Certificate

   

FORUM ABOUT CAMPUS

W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness
of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookies and privacy policy.

Copyright 1999-2026 by Refsnes Data. All Rights Reserved. W3Schools is Powered by W3.CSS.