Python – Changing Items in a Dictionary
Items in a Python dictionary can be changed by referring to its key name or using the update() method.
Python – Adding Items to a Dictionary
Adding an item to a Python dictionary is done by using a new index key and assigning a value to it.
Python – Removing Items from a Dictionary
There are multiple ways to remove items from a Python dictionary: the pop(), popitem(), and clear() methods, as well as the del keyword.
Python – Looping Through a Dictionary
Python dictionary items can be accessed by looping through them using a for loop.
Python – Copying a Dictionary
Python dictionaries can be copied using the copy() method or the dict() function.
Python – Working with Nested Dictionaries
A Python dictionary that contains other dictionaries as items is called a nested dictionary, and can be accessed just like a regular dictionary.
Python – Using Conditions and If Statements
Python supports the usual logical conditions which can be used in several ways, most commonly in various “if statement” types and loops.
Python – Using While Loops
Python uses the while loop to execute a set of statements as long as a condition is true.
Python – Using For Loops
In Python, a for loop is used for iterating over a sequence (list, tuple, dictionary, set, or string).
Python – Functions
A Python function is a block of code that only runs when called. Data, known as parameters, can be passed to a function, and a result can be returned.
Python – Lambda Functions
A Python lambda function is a small anonymous function that can take any number of arguments, but can only have one expression.
Python – Working with Arrays
An array is a special variable, which can hold more than one value at a time. Python does not support actual arrays, but lists can be used as arrays.
Python – Working with Classes and Objects
Since Python is an object-oriented, programming language, almost everything is an object with properties and methods.
Python – Working with Iterators
An iterator is an object that contains a countable number of values and can be iterated upon, meaning that all the values can be traversed through.
Python – Inheritance Between Classes
Python inheritance allows a class (child class) to inherit all the methods and properties from another class (parent class).
Python – Polymorphism
In Python, polymorphism refers to methods/functions/operators with the same name that can be executed on many objects or classes.
Python – Local vs. Global Scope
Scope refers to the availability of a variable. Typically, a variable created inside a function is only available from within that function.