Python is a powerful programming language renowned for its readability, versatility, and ease of use. It has become one of the most popular coding languages among developers worldwide due to its amazing range of applications. To help you learn this versatile language more quickly, we’ve compiled a helpful Python cheat sheet. This cheat sheet concisely summarizes syntax rules, data types, control structures, and other built-in functions essential for any programmer.
Table of Contents
What is Python?
Python is an easy-to-learn, high-level programming language noted for its straightforward syntax, readability, and versatility. Its dynamic typing capabilities allow developers to write concise code that can be used on multiple platforms, such as Windows, Linux, Macintosh, and Solaris.
This wide range of access makes Python popular among programmers for web development, data analysis, artificial intelligence research, scientific computing Python projects, automation needs, and a variety of other applications. You can take this Python programming course to learn more about Python.
What is a Python Cheat Sheet?
A Python cheat sheet is a handy reference guide that provides essential information about the Python programming language in an easily digestible and concise format. It usually describes key syntax rules, data types, control structures (e.g., loops and conditional statements), frequently used built-in functions, and other fundamental concepts needed to effectively use this coding language.
These cheat sheets are beneficial for coders who need quick access to look up certain features of python or syntax while working on their projects.
Python Data Types
In Python, data types are represented as classes, and variables are defined as instances of these classes. The language supports multiple data types, including essential ones, such as:
- integers, for example (a = 2)
- floats (e.g., b = 2.0)
- complex numbers (c = 1 + 2j)
- lists ([1,2,3, ‘Word’] )
- tuples ((1:2:4))
- strings (‘New String’)
- sets ({2 3 4 5})
- dictionaries {‘a’:[1,2], ‘b’: [4 6]}
Python Operators
Python operators have numerous built-in operators that handle multiple types of data. For example, the following operators are available for lists:
- initialization with an empty list ([ ])
- assigning a value to ith index (list[i] = a)
- retrieving elements from ith to j-1th position (list [i:j])
- adding items at the end of the list (append(val))
- deleting items by their indexes using pop([I])
Flow Control Method
Python programming language offers various flow control methods, such as looping and conditional statements, which give programmers the ability to create intricate execution paths. These techniques are key for performing repetitive tasks.
If-Else (Conditional Statement)
age = 25if age >= 18: print("You are an adult.")else: print("You are a minor.")If the value stored in the variable ‘age’ is greater than or equal to 18, then “You are an adult.” will be printed; otherwise, if it’s less than 18, “You are a minor.” will be displayed.
For Loop (Iterative Loop Statement)
numbers = [1, 2, 3, 4, 5]sum_numbers = 0for num in numbers: sum_numbers += numprint("Sum of numbers:", sum_numbers)In this example, the for loop goes through each item in the ‘numbers’ list and adds it to a running total. After going over all elements of the list, it prints out that final sum.
While Loop (Conditional Loop Statement)
countdown = 5while countdown > 0: print("Countdown:", countdown) countdown -= 1print("Liftoff!")This while loop begins with a ‘countdown’ value of 5. It will print the countdown number in each iteration until it reaches 0, at which point “Liftoff!” is printed.
Loop Control: Break, Pass, and Continue
Loop control consists of these three additional statements.
- The ‘Break’ statement stops the loop before it is finished if a certain condition has been met.
- ‘Pass’ indicates that no action needs to be taken at this point in time within the iteration cycle of the program.
- Finally, ‘Continue’ skips any remaining code for its current round and starts a new looping sequence.
Python Functions
A function is a piece of code that will only execute after it has been called. Arguments can be passed to the function and once executed, the outcome or output of the operation is returned as a result. For example,
def new_function(): print("Hello World") # Prints out "Hello Word" when called new_function()Generic Operators
There are many built-in functions in Python that can be used for various tasks. Given below are some of them.
- range(5): The range(5) function returns a list of numbers from 0 to 4 (including both).
- Len(a): Len(a) gives us the number of elements contained within an object ‘a’.
- min(a): The min(a) function finds and returns the minimum value stored inside an object ‘a’.
- max(a): max(a) returns the maximum value within a given set.
- sum(a): The function sum(a) adds up items of an iterable and returns the total.
Python Cheat Sheet for Developers
Let’s explore the highest-rated Python cheat sheet used by coders worldwide. Each has its own pros and cons, but these are held in high regard among programmers to master Python development. With them, you can take your coding skills up to the next level.
Gto76
GitHub’s Gto76 is an extensive Python cheat sheet that provides a comprehensive guide to developers and data scientists of all levels. It covers topics such as enumerates, dictionaries, generators, ranges, iterators, and tuples in detail.
In addition, it contains sections on data types, data images, introspection, scraping, NumPy, metaprogramming, games, logging, operators, audio threading, etc. This makes it the perfect resource for any project involving the Python programming language.
Python for Data Science
This Python cheat sheet has been designed specifically for data science, as opposed to others intended primarily for software development. It includes many fundamentals of using Python that are also beneficial in applications like programming.
This single-page guide is tailored toward providing helpful answers regarding data types and conversions, operators, methods, NumPy, arrays, lists, libraries, variables, and calculations with strings and function methods. It also includes Python installation instructions.
Real Python
Real Python is an in-depth yet straightforward cheat sheet designed to help developers with their programming tasks related to Python. It provides syntax and examples from which you can learn the basics of this language, as well as more complex topics such as Booleans, numbers, functions, strings, control statements, and loops.
Additionally, it’s a great resource for data scientists because it offers tips on tuples, advanced list comprehensions, and numerical lists, most of what would be necessary when working with Python in the field of data science.
Cheatography
Cheatography is a free, two-page cheat sheet for Python that helps you quickly find answers to your programming challenges. It covers topics such as sys variables (sys.argv), file methods, list methods, DateTime methods, and os variables. You can download this Python cheat sheet PDF or PNG format without charge from their website or just read it online.
Basic and Intermediate Cheat Sheet for Data Science
This DATAQUEST cheat sheet offers both basic and intermediate levels of detailed knowledge for those looking to learn more about data science. To get the most out of this resource, it is important to be knowledgeable in topics such as range, lists, logging, scraping, and NumPy before delving into its intermediate-level information.
The basics provide a thorough overview of fundamental Python concepts while the intermediate section targets experienced developers with an established knowledge base.
Pythoncheatsheet.org
Pythoncheatsheet.org has been highly ranked for many years and provides comprehensive coverage of various aspects of the Python language, including basic concepts, advanced features (e.g., exception handling, virtual environments, functions), data structures (lists, JSON objects), etc.
It is regularly updated with bug fixes as well as new additions in the language, making it suitable both for beginners and experienced developers. Additionally, the website comprises an active community where users can benefit from each other’s input.
Programming With Mosh
Mosh Hamedani, a software engineer and the creator of the “Programming With Mosh” YouTube channel put together this comprehensive cheat sheet that stands out from other sheets. It covers everything you’ll find on Pythoncheatsheet.org but goes one step further to include additional topics. These topics include operators, packages, and PyPI libraries for those already familiar with programming basics.
Python Crash Course
Python crash course is a multi-page reference guide designed for both beginners and experienced Python developers. It covers topics such as lists, variables, classes, dictionaries, functions, and more. The main focus of the course is on creating and manipulating lists, accessing elements in a list, understanding numerical lists, and using advanced list comprehensions and tuples effectively. This cheat sheet provides an essential overview for users to rapidly gain proficiency with operators related to Python lists.
BOKEH Cheat Sheet
This cheat sheet offers an invaluable resource for data science professionals who want to make the most of Bokeh’s capabilities. It guides users through the steps needed to create interactive plots, dashboards, and other data visualizations with Python. It provides instructions on prepping datasets, adding renderers for custom visuals, as well as outputting and displaying/saving figures all in one document. Therefore, eliminating the need for multiple documents.
Website Setup
Website setup is a comprehensive Python cheat sheet that follows the same structure as Pythoncheatsheet.org in ranking its topics. All of the primary and intermediate concepts related to programming with Python are discussed, such as defining functions, data types, loops, lists, dealing with exceptions, tuples, math operators, conditional statements, and dictionaries among many other areas. It also provides guidance on how to use these elements effectively for creating strings and troubleshooting errors encountered while coding.
Conclusion
A Python cheat sheet is an invaluable resource for coders of all levels. It offers essential information about the language in a concise format and provides quick access to syntax rules, data types, control structures, built-in functions, and other fundamentals that facilitate effective coding. Therefore, no matter what type of project is being worked on, having easy access to this reference material can dramatically boost efficiency and proficiency when programming with Python.
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