Installing Python 3 on Mac OS X

Installing Python 3 on Linux

Getting Started With Python IDLE

Installing PyCharm

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A Python variable is a reserved memory location to store values. In other words, a variable in a python program gives data to the computer for processing. Every value in Python has a datatype. Different data types in Python are Numbers, List, Tuple, Strings, Dictionary, etc.

In programming, data type is an important concept. Python Data Types

Python Arithmetic Operators

Assignment Operators in Python.

Comparison Operators in Python

Logical Operators in Python

String Special Operators in Python

The order Python operators are executed in is governed by the operator precedence, and follow the same rules. Operators with higher precedence are executed before those with lower precedence, but operators have matching precedence when they are in the same group.

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In Python, Strings are arrays of bytes representing Unicode characters. However, Python does not have a character data type, a single character is simply a string with a length of 1. Square brackets can be used to access elements of the string.

Python has a set of built-in methods that you can use on strings.

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Conditional Statement in Python perform different computations or actions depending on whether a specific Boolean constraint evaluates to true or false.

Conditional statements are handled by IF statements in Python.

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Python - Loops

Introduction to loops in python

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Python Loops. Python has two primitive loop commands: while loops; for loops. The while Loop.

Python Loops. Python has two primitive loop commands: while loops; for loops. The for Loop.

The break statement in Python terminates the current loop and resumes execution at the next statement, just like the traditional break found in C.

The continue statement in Python returns the control to the beginning of the while loop. The continue statement rejects all the remaining statements in the current iteration of the loop and moves the control back to the top of the loop.

The pass statement in Python is used when a statement is required syntactically but you do not want any command or code to execute.

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Python program. The name of the Python file becomes the module name. The module contains

1) definitions and implementation of classes

2) variables and

3) functions that can be used inside another program.

A function call is an expression that passes control and arguments (if any) to a function and has the form: expression (expression-listopt) where expression is a function name or evaluates to a function address and expression-list is a list of expressions (separated by commas).

The four steps to defining a function in Python are the following:

1. Use the keyword def to declare the function and follow this up with the function name.

2. Add parameters to the function: they should be within the parentheses of the function. End your line with a colon.

3. Add statements that the functions should execute.

4. End your function with a return statement if the function should output something. Without the return statement, your function will return an object None.

The terms parameter and argument can be used for the same thing: information that are passed into a function. From a function's perspective: A parameter is the variable listed inside the parentheses in the function definition. An argument is the value that are sent to the function when it is called.

Syntax. Simply put, a lambda function is just like any normal python function, except that it has no name when defining it, and it is contained in one line of code.

Python Global, Local and Nonlocal variables

A recursive function is a function defined in terms of itself via self-referential expressions. This means that the function will continue to call itself and repeat its behavior until some condition is met to return a result.

A module is a file containing Python definitions and statements. A module can define functions, classes, and variables. A module can also include runnable code. Grouping related code into a module makes the code easier to understand and use. It also makes the code logically organized.

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Find, install and publish Python packages with the Python Package Index

Python Keywords: An Introduction

Iterate over a list in Python

Append()

Insert()

Remove()

Pop()

Python has a set of built-in methods that you can use on lists/arrays.

List comprehension offers a shorter syntax when you want to create a new list based on the values of an existing list.

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Tuple is one of 4 built-in data types in Python used to store collections of data, the other 3 are List, Set, and Dictionary, all with different qualities and usage.

A tuple is a collection which is ordered and unchangeable.

Python Loop Through a Tuple

There are three standard sequence operations ( + , * , [] ) that can be performed with tuple s as well as list s and string s.

Python has two built-in methods that you can use on tuples. Method, Description. count(), Returns the number of times a specified value occurs in a tuple.

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Dictionaries are used to store data values in key:value pairs. A dictionary is a collection which is ordered*, changeable and does not allow duplicates.

filter() is another built-in function that you can use to iterate through a dictionary in Python and filter out some of its items.

Learn more about dictionaries in our Python Dictionaries Tutorial.

Python has a set of built-in methods that you can use on dictionaries. Method, Description. clear(), Removes all the elements from the dictionary.

Dictionary comprehensions allow for generating keys of tuples by implemented nested loops. Each pair of items in the lists is a key in the dictionary. The value is the product of the items in keys.

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Sets are used to store multiple items in a single variable.

In Python, Set is an unordered collection of data type that is iterable, mutable and has no duplicate elements.

Many of the operations that can be used for Python's other composite data types don't make sense for sets.

Python has a set of built-in methods that you can use on sets. Method, Description.

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A directory or folder is a collection of files and subdirectories.