Python Keywords

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Python has a set of keywords that are reserved words that cannot be used as variable names, function names, or any other identifiers:

Keyword	Description
and	A logical operator
as	To create an alias
assert	For debugging
break	To break out of a loop
class	To define a class
continue	To continue to the next iteration of a loop
def	To define a function
del	To delete an object
elif	Used in conditional statements, same as else if
else	Used in conditional statements
except	Used with exceptions, what to do when an exception occurs
False	Boolean value, result of comparison operations
finally	Used with exceptions, a block of code that will be executed no matter if there is an exception or not
for	To create a for loop
from	To import specific parts of a module
global	To declare a global variable
if	To make a conditional statement
import	To import a module
in	To check if a value is present in a list, tuple, etc.
is	To test if two variables are equal
lambda	To create an anonymous function
None	Represents a null value
nonlocal	To declare a non-local variable
not	A logical operator
or	A logical operator
pass	A null statement, a statement that will do nothing
raise	To raise an exception
return	To exit a function and return a value
True	Boolean value, result of comparison operations
try	To make a try...except statement
while	To create a while loop
with	Used to simplify exception handling
yield	To end a function, returns a generator Built-in Exceptions The table below shows built-in exceptions that are usually raised in Python: Exception Description ArithmeticError Raised when an error occurs in numeric calculations AssertionError Raised when an assert statement fails AttributeError Raised when attribute reference or assignment fails Exception Base class for all exceptions EOFError Raised when the input() method hits an "end of file" condition (EOF) FloatingPointError Raised when a floating point calculation fails GeneratorExit Raised when a generator is closed (with the close() method) ImportError Raised when an imported module does not exist IndentationError Raised when indendation is not correct IndexError Raised when an index of a sequence does not exist KeyError Raised when a key does not exist in a dictionary KeyboardInterrupt Raised when the user presses Ctrl+c, Ctrl+z or Delete LookupError Raised when errors raised cant be found MemoryError Raised when a program runs out of memory NameError Raised when a variable does not exist NotImplementedError Raised when an abstract method requires an inherited class to override the method OSError Raised when a system related operation causes an error OverflowError Raised when the result of a numeric calculation is too large ReferenceError Raised when a weak reference object does not exist RuntimeError Raised when an error occurs that do not belong to any specific expections StopIteration Raised when the next() method of an iterator has no further values SyntaxError Raised when a syntax error occurs TabError Raised when indentation consists of tabs or spaces SystemError Raised when a system error occurs SystemExit Raised when the sys.exit() function is called TypeError Raised when two different types are combined UnboundLocalError Raised when a local variable is referenced before assignment UnicodeError Raised when a unicode problem occurs UnicodeEncodeError Raised when a unicode encoding problem occurs UnicodeDecodeError Raised when a unicode decoding problem occurs UnicodeTranslateError Raised when a unicode translation problem occurs ValueError Raised when there is a wrong value in a specified data type ZeroDivisionError Raised when the second operator in a division is zero This is a list of all the features explained in the Python Tutorial. Feature Description Indentation Indentation refers to the spaces at the beginning of a code line Comments Comments are code lines that will not be executed Multi Line Comments How to insert comments on multiple lines Creating Variables Variables are containers for storing data values Variable Names How to name your variables Assign Values to Multiple Variables How to assign values to multiple variables Output Variables Use the print statement to output variables String Concatenation How to combine strings Global Variables Global variables are variables that belongs to the global scope Built-In Data Types Python has a set of built-in data types Getting Data Type How to get the data type of an object Setting Data Type How to set the data type of an object Numbers There are three numeric types in Python Int The integer number type Float The floating number type Complex The complex number type Type Conversion How to convert from one number type to another Random Number How to create a random number Specify a Variable Type How to specify a certain data type for a variable String Literals How to create string literals Assigning a String to a Variable How to assign a string value to a variable Multiline Strings How to create a multi line string Strings are Arrays Strings in Python are arrays of bytes representing Unicode characters Slicing a String How to slice a string Negative Indexing on a String How to use negative indexing when accessing a string String Length How to get the length of a string Check In String How to check if a string contains a specified phrase Format String How to combine two strings Escape Characters How to use escape characters Boolean Values True or False Evaluate Booleans Evaluate a value or statement and return either True or False Return Boolean Value Functions that return a Boolean value Operators Use operator to perform operations in Python Arithmetic Operators Arithmetic operator are used to perform common mathematical operations Assignment Operators Assignment operators are use to assign values to variables Comparison Operators Comparison operators are used to compare two values Logical Operators Logical operators are used to combine conditional statements Identity Operators Identity operators are used to see if two objects are in fact the same object Membership Operators Membership operators are used to test is a sequence is present in an object Bitwise Operators Bitwise operators are used to compare (binary) numbers Lists A list is an ordered, and changeable, collection Access List Items How to access items in a list Change List Item How to change the value of a list item Loop Through List Items How to loop through the items in a list Check if List Item Exists How to check if a specified item is present in a list List Length How to determine the length of a list Add List Items How to add items to a list Remove List Items How to remove list items Copy a List How to copy a list Join Two Lists How to join two lists Tuple A tuple is an ordered, and unchangeable, collection Access Tuple Items How to access items in a tuple Change Tuple Item How to change the value of a tuple item Loop List Items How to loop through the items in a tuple Check if Tuple Item Exists How to check if a specified item is present in a tuple Tuple Length How to determine the length of a tuple Tuple With One Item How to create a tuple with only one item Remove Tuple Items How to remove tuple items Join Two Tuples How to join two tuples Set A set is an unordered, and unchangeable, collection Access Set Items How to access items in a set Add Set Items How to add items to a set Loop Set Items DETTE KAPITTELET MANGLER Check if Set Item Exists DETTE KAPITTELET MANGLER Set Length How to determine the length of a set Remove Set Items How to remove set items Join Two Sets How to join two sets Dictionary A dictionary is an unordered, and changeable, collection Access Dictionary Items How to access items in a dictionary Change Dictionary Item How to change the value of a dictionary item Loop Dictionary Items How to loop through the items in a tuple Check if Dictionary Item Exists How to check if a specified item is present in a dictionary Dictionary Length How to determine the length of a dictionary Add Dictionary Item How to add an item to a dictionary Remove Dictionary Items How to remove dictionary items Copy Dictionary How to copy a dictionary Nested Dictionaries A dictionary within a dictionary If Statement How to write an if statement If Indentation If statemnts in Python relies on indentation (whitespace at the beginning of a line) Elif elif is the same as "else if" in other programming languages Else How to write an if...else statement Shorthand If How to write an if statement in one line Shorthand If Else How to write an if...else statement in one line If AND Use the and keyword to combine if statements If OR Use the or keyword to combine if statements Nested If How to write an if statement inside an if statement The pass Keyword in If Use the pass keyword inside empty if statements While How to write a while loop While Break How to break a while loop While Continue How to stop the current iteration and continue wit the next While Else How to use an else statement in a while loop For How to write a for loop Loop Through a String How to loop through a string For Break How to break a for loop For Continue How to stop the current iteration and continue wit the next Looping Through a rangee How to loop through a range of values For Else How to use an else statement in a for loop Nested Loops How to write a loop inside a loop For pass Use the pass keyword inside empty for loops Function How to create a function in Python Call a Function How to call a function in Python Function Arguments How to use arguments in a function *args To deal with an unknown number of arguments in a function, use the * symbol before the parameter name Keyword Arguments How to use keyword arguments in a function *kwargs To deal with an unknown number of keyword arguments in a function, use the * symbol before the parameter name Default Parameter Value How to use a default parameter value Passing a List as an Argument How to pass a list as an argument Function Return Value How to return a value from a function The pass Statement i Functions Use the pass statement in empty functions Function Recursion Functions that can call itself is called recursive functions Lambda Function How to create anonymous functions in Python Why Use Lambda Functions Learn when to use a lambda function or not Array Lists can be used as Arrays What is an Array Arrays are variables that can hold more than one value Access Arrays How to access array items Array Length How to get the length of an array Looping Array Elements How to loop through array elements Add Array Element How to add elements from an array Remove Array Element How to remove elements from an array Array Methods Python has a set of Array/Lists methods Class A class is like an object constructor Create Class How to create a class The Class __init__() Function The __init__() function is executed when the class is initiated Object Methods Methods in objects are functions that belongs to the object self The self parameter refers to the current instance of the class Modify Object Properties How to modify properties of an object Delete Object Properties How to modify properties of an object Delete Object How to delete an object Class pass Statement Use the pass statement in empty classes Create Parent Class How to create a parent class Create Child Class How to create a child class Create the __init__() Function How to create the __init__() function super Function The super() function make the child class inherit the parent class Add Class Properties How to add a property to a class Add Class Methods How to add a method to a class Iterators An iterator is an object that contains a countable number of values Iterator vs Iterable What is the difference between an iterator and an iterable Loop Through an Iterator How to loop through the elements of an iterator Create an Iterator How to create an iterator StopIteration How to stop an iterator Global Scope When does a variable belong to the global scope? Global Keyword The global keyword makes the variable global Create a Module How to create a module Variables in Modules How to use variables in a module Renaming a Module How to rename a module Built-in Modules How to import built-in modules Using the dir() Function List all variable names and function names in a module Import From Module How to import only parts from a module Datetime Module How to work with dates in Python Date Output How to output a date Create a Date Object How to create a date object The strftime Method How to format a date object into a readable string Date Format Codes The datetime module has a set of legal format codes JSON How to work with JSON in Python Parse JSON How to parse JSON code in Python Convert into JSON How to convert a Python object in to JSON Format JSON How to format JSON output with indentations and line breaks Sort JSON How to sort JSON RegEx Module How to import the regex module RegEx Functions The re module has a set of functions Metacharacters in RegEx Metacharacters are characters with a special meaning RegEx Special Sequences A backslash followed by a a character has a special meaning RegEx Sets A set is a set of characters inside a pair of square brackets with a special meaning RegEx Match Object The Match Object is an object containing information about the search and the result Install PIP How to install PIP PIP Packages How to download and install a package with PIP PIP Remove Package How to remove a package with PIP Error Handling How to handle errors in Python Handle Many Exceptions How to handle more than one exception Try Else How to use the else keyword in a try statement Try Finally How to use the finally keyword in a try statement raise How to raise an exception in Python