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ur newsletter and get access to exclusive content every month emojis reference check out our refererence page with all the emojis supported in html code game w3schools coding game help the lynx collect pine cones utf 8 reference check out our full utf 8 character reference community chat learn and connect with us on discord academy contact us about w3schools academy for educational institutions for businesses contact us about w3schools academy for your organization contact us about sales sales w3schools com about errors help w3schools com 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 python output 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 python numbers numbers code challenge python casting casting code challenge python strings 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 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 python tuples access tuples update tuples unpack tuples loop tuples join tuples tuple methods tuple exercises code challenge python sets 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 python match 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 python range range code challenge python arrays arrays code challenge python iterators iterators code challenge python modules modules code challenge python dates dates code challenge python math math code challenge python json json code challenge python regex regex code challenge python pip python try except try except code challenge python string formatting string formatting code challenge python none 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 reference python overview python built in functions python string methods python list methods python dictionary methods python tuple methods python set methods python file methods python keywords python exceptions python glossary module reference built in modules random module requests module statistics module math module cmath module python how to remove list duplicates reverse a string add two numbers python examples python examples 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 examples previous next share link copied python syntax print hello world comments in python docstrings syntax explained python variables create a variable output both text and a variable add a variable to another variable variables explained python numbers verify the type of an object create integers create floating point numbers create scientific numbers with an e to indicate the power of 10 create complex numbers numbers explained python casting casting integers casting floats casting strings casting explained python strings get the character at position 1 of a string substring get the characters from position 2 to position 5 not included remove whitespace from the beginning or at the end of a string return the length of a string convert a string to lower case convert a string to upper case replace a string with another string split a string into substrings strings explained python operators addition operator subtraction operator multiplication operator division operator modulus operator assignment operator operators explained python lists create a list access list items change the value of a list item loop through a list check if a list item exists get the length of a list add an item to the end of a list add an item at a specified index remove an item remove the last item remove an item at a specified index empty a list using the list constructor to make a list lists explained python tuples create a tuple access tuple items change tuple values loop through a tuple check if a tuple item exists get the length of a tuple delete a tuple using the tuple constructor to create a tuple tuples explained python sets create a set loop through a set check if an item exists add an item to a set add multiple items to a set get the length of a set remove an item in a set remove an item in a set by using the discard method remove the last item in a set by using the pop method empty a set delete a set using the set constructor to create a set sets explained python dictionaries create a dictionary access the items of a dictionary change the value of a specific item in a dictionary print all key names in a dictionary one by one print all values in a dictionary one by one using the values function to return values of a dictionary loop through both keys an values by using the items function check if a key exists get the length of a dictionary add an item to a dictionary remove an item from a dictionary empty a dictionary using the dict constructor to create a dictionary dictionaries explained python if else the if statement the elif statement the else statement short hand if short hand if else the and keyword the or keyword if else explained python while loop the while loop using the break statement in a while loop using the continue statement in a while loop while loop explained python for loop the for loop loop through a string using the break statement in a for loop using the continue statement in a for loop using the range function in a for loop else in for loop nested for loop for loop explained python functions create and call a function function parameters default parameter value let a function return a value recursion functions explained python lambda a lambda function that adds 10 to the number passed in as an argument a lambda function that multiplies argument a with argument b a lambda function that sums argument a b and c lambda explained python arrays create an array access the elements of an array change the value of an array element get the length of an array loop through all elements of an array add an element to an array remove an element from an array arrays explained python classes and objects create a class create an object the __init__ function create object methods the self parameter modify object properties delete object properties delete an object classes objects explained python iterators return an iterator from a tuple return an iterator from a string loop through an iterator create an iterator stop iteration iterators explained python modules use a module variables in module re naming a module built in modules using the dir function import from module modules explained python dates import the datetime module and display the current date return the year and name of weekday create a date object the strftime method dates explained python math find the lowest and highest value in an iterable return the absolute value of a number return the value of x to the power of y x y return the square root of a number round a number upwards and downwards to its nearest integer return the value of pi math explained python json convert from json to python convert from python to json convert python objects into json strings convert a python object containing all the legal data types use the indent parameter to define the numbers of indents use the separators parameter to change the default separator use the sort_keys parameter to specify if the result should be sorted or not json explained python regex search a string to see if it starts with the and ends with spain using the findall function using the search function using the split function using the sub function regex explained python pip using a package pip explained python try except when an error occurs print a message many exceptions use the else keyword to define a block of code to be executed if no errors were raised use the finally block to execute code regardless if the try block raises an error or not try except explained python file handling read a file read only parts of a file read one line of a file loop through the lines of a file to read the whole file line by line file handling explained python mysql create a connection to a database create a database in mysql check if a database exist create a table check if a table exist create primary key when creating a table insert a record in a table insert multiple rows get inserted id select all records from a table select only some of the columns in a table use the fetchone method to fetch only one row in a table select with a filter wildcards characters prevent sql injection sort the result of a table alphabetically sort the result in a descending order reverse alphabetically delete records from an existing table prevent sql injection delete an existing table delete a table if it exist update existing records in a table prevent sql injection limit the number of records returned from a query combine rows from two or more tables based on a related column between them left join right join mysql explained python mongodb create a database check if a database exist create a collection check if a collection exist insert into collection return the id field insert multiple documents insert multiple documents with specified ids find the first document in the selection find all documents in the selection find only some fields filter the result advanced query filter with regular expressions sort the result alphabetically sort the result descending reverse alphabetically delete document delete many documents delete all documents in a collection delete a collection update a document update many all documents limit the result mongodb explained previous next 1 sign in to track progress remove ads 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 download on the app store get it on google play try now in browser plus spaces get certified for teachers practice contact us contact sales if you want to use w3schools services as an educational institution team or enterprise send us an e mail sales w3schools com report error if you want to report an error or if you want to make a suggestion send us an e mail help w3schools com top tutorials html tutorial css tutorial javascript tutorial how to tutorial sql tutorial python tutorial w3 css 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