How to Use QPython: A Guide for Beginners
Hello, this is Bing. I see that you are interested in learning how to use QPython, a script engine that runs Python on Android devices. QPython is a great tool for Python enthusiasts who want to develop and run Python scripts and projects on their mobile phones. In this article, I will show you how to download and install QPython, how to write and execute Python code, and how to use some of the features and libraries that QPython offers. I will also compare QPython with Python and some of its alternatives, and answer some frequently asked questions about QPython. Let's get started!
How to download and install QPython
The easiest way to get QPython is to install it from . You can search for "QPython" or "QPython3" depending on which version you want. The difference between them is that QPython uses Python 2.7 as the default interpreter, while QPython3 uses Python 3.6. You can also switch between them in the settings.
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If you don't have access to Google Play or prefer another source, you can also download the APK files from . There are different branches of QPython that have different permissions and features. For example, O means it supports both Python 2 and 3, L means it has limited permissions, S means it has sensitive permissions, etc. You can choose the one that suits your needs.
After downloading the APK file, you need to transfer it to your Android device and install it by tapping on it. You may need to enable the option "Allow installation of apps from unknown sources" in your device settings before doing so.
Once you have installed QPython successfully, you should see its icon in your app menu. Tap on it to launch it.
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How to write and execute Python code with QPython
QPython provides three main modes for writing and executing Python code: console mode, editor mode, and webapp mode.
<h3 Console mode
The console mode is the simplest way to interact with the Python interpreter. You can type Python commands and expressions in the console and see the results immediately. You can also use the console to test your code, debug errors, or explore Python features and libraries.
To enter the console mode, tap on the "Console" icon in the QPython main menu. You should see a prompt that looks like this:
>>>
This means you are ready to type Python code. For example, you can type:
>>> print("Hello, QPython!") Hello, QPython!
You can also use the console to perform calculations, assign variables, define functions, import modules, etc. For example, you can type:
>>> a = 10 >>> b = 20 >>> a + b 30 >>> def square(x): ... return x * x ... >>> square(5) 25 >>> import math >>> math.pi 3.141592653589793
To exit the console mode, you can press the back button on your device or type exit() in the console.
Editor mode
The editor mode is the way to create and run Python scripts with QPython. You can use the editor to write Python code, save it as a file, and execute it with a single tap. You can also edit existing Python files or open them from other sources.
To enter the editor mode, tap on the "Editor" icon in the QPython main menu. You should see a blank screen with a toolbar at the top. The toolbar has several buttons that allow you to create a new file, open an existing file, save your changes, run your code, etc.
To create a new file, tap on the "+" button and choose "New". You should see a dialog box that asks you to enter a file name and choose a location to save it. You can also choose a template for your file, such as "Hello World", "Web App", or "SL4A". For example, if you choose "Hello World", you will see a file that contains this code:
The first two lines are comments that tell QPython which version of Python and which mode to use for this file. The third line is the actual code that prints "Hello World" to the console.
You can edit this file or write your own code using the keyboard or the built-in code editor features. The code editor has syntax highlighting, auto-completion, indentation, etc. You can also use gestures to zoom in or out, undo or redo, copy or paste, etc.
To save your changes, tap on the "Save" button or press Ctrl+S on your keyboard. To run your code, tap on the "Run" button or press Ctrl+R on your keyboard. You should see the output of your code in the console below the editor.
To open an existing file, tap on the "Open" button and choose a file from your device storage or from other sources such as Dropbox, Google Drive, FTP, etc. You can also scan a QR code that contains a URL of a Python file and open it directly.
WebApp mode
The webapp mode is the way to create and run web applications with QPython. You can use the webapp mode to create dynamic web pages with Python code and HTML templates. You can also use web frameworks such as Flask or Django to build more complex web applications.
To enter the webapp mode, tap on the "WebApp" icon in the QPython main menu. You should see a list of web applications that are available on your device. You can also add more web applications by tapping on the "+" button and choosing a source.
To create a new web application, you need to have a folder that contains at least two files: main.py and index.html. The main.py file is where you write your Python code that handles the requests and responses of your web application. The index.html file is where you write your HTML template that defines the layout and content of your web page.
For example, you can create a folder named and put these two files in it:
# main.py from bottle import route, run, template @route('/') def index(): return template('index.html') run(host='localhost', port=8080)
<!-- index.html --> <html> <head> <title>Hello WebApp</title> </head> <body> <h1>Hello, QPython!</h1> <p>This is a simple web application made with QPython.</p> </body> </html>
The main.py file uses the web framework to create a route for the root URL (/) and return the index.html template as the response. The index.html file contains some basic HTML elements that display a greeting message.
To run your web application, you need to add it to the webapp list by tapping on the "+" button and choosing "Local". You should see a dialog box that asks you to enter a name and a path for your web application. For example, you can enter "Hello WebApp" as the name and "/sdcard/hello" as the path. Then tap on "OK" to add it.
To launch your web application, tap on its name in the webapp list. You should see a browser window that opens your web page. You can also access your web page from other devices by entering the IP address and port number of your Android device in their browsers. For example, if your Android device has the IP address 192.168.1.100, you can enter in another device's browser to see your web page.
How to use QPython features and libraries
QPython offers some features and libraries that make it more powerful and versatile than regular Python. You can use these features and libraries to access Android APIs, create SL4A applications, install third-party Python libraries, and use QR code tools.
Android APIs access
One of the most useful features of QPython is that it allows you to access Android APIs from Python code. This means you can use Python to control and interact with Android features such as SMS, GPS, Bluetooth, camera, sensors, etc.
To access Android APIs from Python code, you need to use the androidhelper module that QPython provides. This module is a wrapper for the , which is an open source project that enables scripting languages to access Android APIs.
To use the androidhelper module, you need to import it in your Python code and create an instance of the Android class. For example:
import androidhelper droid = androidhelper.Android()
The droid object has many methods that correspond to different Android APIs. You can use these methods to perform various tasks with your Android device. For example, you can use the droid.makeToast() method to display a toast message on your device screen:
droid.makeToast("Hello, Android!")
You can also use the droid.dialogCreateAlert(), droid.dialogSetPositiveButtonText(), droid.dialogShow(), and droid.dialogGetResponse() methods to create and show an alert dialog on your device screen:
droid.dialogCreateAlert("QPython", "Do you like QPython?") droid.dialogSetPositiveButtonText("Yes") droid.dialogSetNegativeButtonText("No") droid.dialogShow() response = droid.dialogGetResponse().result if response["which"] == "positive": droid.makeToast("Glad to hear that!") else: droid.makeToast("Sorry to hear that!")
You can find more methods and examples of the androidhelper module in the .
<h3 QSL4A library
Another feature of QPython is that it allows you to create SL4A applications with Python code. SL4A applications are scripts that run on the SL4A service, which is a background process that provides access to Android APIs and other features. SL4A applications can run in the background, interact with other applications, or use the SL4A user interface.
To create SL4A applications with Python code, you need to use the qsl4ahelper module that QPython provides. This module is a wrapper for the project, which is a fork of the SL4A project that adds some enhancements and fixes some bugs.
To use the qsl4ahelper module, you need to import it in your Python code and create an instance of the QSL4A class. For example:
import qsl4ahelper qsl = qsl4ahelper.QSL4A()
The qsl object has many methods that correspond to different SL4A features. You can use these methods to perform various tasks with your SL4A application. For example, you can use the qsl.notify() method to display a notification on your device status bar:
qsl.notify("QPython", "This is a QSL4A application")
You can also use the qsl.startActivity(), qsl.sendBroadcast(), and qsl.startService() methods to interact with other Android applications or services:
# Start an activity that opens a web page qsl.startActivity(action="android.intent.action.VIEW", uri=" # Send a broadcast that turns on the flashlight qsl.sendBroadcast(action="net.cactii.flash2.TOGGLE_FLASH") # Start a service that plays music qsl.startService(action="com.android.music.musicservicecommand", extras="command": "play")
You can find more methods and examples of the qsl4ahelper module in the .
Pip console
A useful feature of QPython is that it allows you to install third-party Python libraries with the pip package manager. Pip is a tool that lets you download and install Python packages from the Python Package Index (PyPI) or other sources.
To use pip with QPython, you need to run the pip_console.py script that QPython provides. This script is a modified version of pip that works with QPython's environment.
To run the pip_console.py script, you need to tap on the "Pip" icon in the QPython main menu. You should see a console window that looks like this:
Pip console for QPython >>>
This means you are ready to type pip commands. For example, you can type:
>>> pip install requests Collecting requests Downloading requests-2.26.0-py2.py3-none-any.whl (62 kB) Collecting urllib3<1.27,>=1.21.1 Downloading urllib3-1.26.7-py2.py3-none-any.whl (138 kB) Collecting idna<4,>=2.5; python_version < "3" Downloading idna-2.10-py2.py3-none-any.whl (58 kB) Collecting certifi>=2017.4.17 Downloading certifi-2021.10.8-py2.py3-none-any.whl (149 kB) Collecting charset-normalizer=2.0.0; python_version >= "3" Downloading charset_normalizer-2.0.9-py3-none-any.whl (39 kB) Installing collected packages: urllib3, idna, certifi, charset-normalizer, requests Successfully installed certifi-2021.10.8 charset-normalizer-2.0.9 idna-2.10 requests-2.26.0 urllib3-1.26.7
This command will install the requests library, which is a popular library for making HTTP requests in Python.
You can also use pip to uninstall, upgrade, list, or search Python packages with pip. For example, you can type: >>> pip uninstall requests Found existing installation: requests 2.26.0 Uninstalling requests-2.26.0: Would remove: /data/data/org.qpython.qpy/files/lib/python2.7/site-packages/requests-2.26.0.dist-info/* /data/data/org.qpython.qpy/files/lib/python2.7/site-packages/requests/* Proceed (y/n)? y Successfully uninstalled requests-2.26.0 >>> pip install --upgrade pip Collecting pip Downloading pip-21.3.1-py3-none-any.whl (1.7 MB) Installing collected packages: pip Attempting uninstall: pip Found existing installation: pip 20.3.4 Uninstalling pip-20.3.4: Successfully uninstalled pip-20.3.4 Successfully installed pip-21.3.1 >>> pip list Package Version ----------------- ------- certifi 2021.10.8 charset-normalizer 2.0.9 idna 2.10 pip 21.3.1 qsl4ahelper 1.0 setuptools 44.1.1 urllib3 1.26.7 >>> pip search numpy numpy (1.21.4) - NumPy is the fundamental package for array computing with Python. numpy-quaternion (2021.11.11) - Add built-in support for quaternions to numpy numpy-stl (2.16.0) - Library to make reading, writing and modifying both binary and ascii STL files easy. numpy-groupies (0.9.13) - Optimised tools for group-indexing operations: aggregated sum and more. numpy-financial (1.0.0) - Financial functions for NumPy
You can find more commands and options of the pip_console.py script in the . QR code reader and generator
A handy feature of QPython is that it allows you to use QR code tools to transfer and share Python code with other devices or users. QR codes are two-dimensional barcodes that can store text, URLs, or other data.
To use QR code tools with QPython, you need to tap on the "QR" icon in the QPython main menu. You should see a screen that has two tabs: "Reader" and "Generator".
The "Reader" tab allows you to scan a QR code that contains a URL of a Python file and open it in the editor mode automatically. You can use this feature to import Python code from other sources or devices easily.
To use the "Reader" tab, you need to tap on the "Scan" button and point your device camera at the QR code that you want to scan. You should see a message that says "Scanning..." and then "Success!" if the QR code is valid and contains a URL of a Python file.
The "Generator" tab allows you to generate a QR code that contains the URL of a Python file that you have created or edited in the editor mode. You can use this feature to export or share Python code with other devices or users conveniently.
To use the "Generator" tab, you need to tap on the "Generate" button and choose a Python file from your device storage or from other sources such as Dropbox, Google Drive, FTP, etc.
You should see a QR code that contains the URL of your chosen Python file on the screen.
QPython vs Python and alternatives
QPython is a powerful and versatile tool that allows you to run Python on Android devices, but how does it compare with regular Python and some of its alternatives? Let's take a look at some of the differences and similarities between them.
QPython vs Python
QPython is based on Python, which means it uses the same syntax, grammar, data types, operators, control structures, etc., as regular Python.
However, QPython is not exactly the same as regular Python, because it has some limitations and differences due to its nature as a script engine that runs on Android devices.
Some of the limitations and differences are:
QPython does not support all the standard Python libraries or modules, such as os, sys, socket, etc., because they are not compatible with Android's environment or security policies. QPython provides some alternative modules or features to compensate for these limitations, such as androidhelper, qsl4ahelper, pip_console.py, etc.
QPython does not support all the Python versions or features, because it depends on the Python interpreters that are embedded in its APK files. QPython supports Python 2.7 and 3.6 as the default interpreters, but you can also switch to other versions such as 2.6, 3.2, or 3.4 in the settings. However, some newer features of Python, such as f-strings, async/await, type hints, etc., are not available in QPython.
QPython does not have the same performance or efficiency as regular Python, because it runs on a virtual machine that is slower and consumes more resources than a native machine. QPython also has some overheads due to its interaction with Android's environment or security policies. QPython may run slower or crash more often than regular Python, especially when dealing with large or complex data or code.
Despite these limitations and differences, QPython is still a powerful and versatile tool that allows you to run Python on Android devices, which is something that regular Python cannot do. QPython also offers some features and libraries that make it more suitable and convenient for Android development and scripting.
QPython vs QPython3
QPython and QPython3 are two branches of QPython that have different versions, permissions, features, etc.
The main difference between them is that QPython uses Python 2.7 as the default interpreter, while QPython3 uses Python 3.6. This means they have different syntax, grammar, data types, operators, control structures, etc., as well as different standard libraries and modules.
Some of the differences between Python 2 and Python 3 are:
Python 2 uses print as a statement, while Python 3 uses print as a function. For example:
# Python 2 print "Hello, QPython!" # Python 3 print("Hello, QPython!")
Python 2 uses raw_input() to get user input as a string, while Python 3 uses input(). For example:
# Python 2 name = raw_input("What is your name? ") # Python 3 name = input("What is your name? ")
Python 2 uses / to perform integer division if both operands are integers, while Python 3 uses //. For example:
# Python 2 10 / 3 # returns 3 # Python 3 10 / 3 # returns 3.3333333333333335 10 // 3 # returns 3
Python 2 uses str to represent text and unicode to represent Unicode text, while Python 3 uses str to represent Unicode text and bytes to represent binary data. For example:
# Python 2 s = "Hello" # s is a str object u = u"Hello" # u is a unicode object # Python 3 s = "Hello" # s is a str object that contains Unicode text b = b"Hello" # b is a bytes object that contains binary data
You can find more differences between Python 2 and Python 3 in the .
The other difference between QPython and QPython3 is that they have different permissions and features. QPython has more permissions and features than QPython3, such as access to SMS, GPS, Bluetooth, camera, sensors, etc., but it also requires more resources and may cause more security issues. QPython3 has fewer permissions and features than QPython, but it also consumes less resources and may be more stable and secure.
You can choose between QPython and QPython3 depending on your needs and preferences. You can also install both of them on your device and switch between them in the settings.
QPython vs other alternatives
QPython is not the only language or tool that can run on Android devices. There are some other alternatives that you may want to consider or compare with QPython.
Some of the alternatives are:
: Java is the official language for Android development, which means it has the most support and compatibility with Android's environment and features. Java is a compiled, object-oriented, and high-level language that runs on the Java Virtual Machine (JVM). Java is a powerful and versatile language that can create complex and robust applications, but it also has some drawbacks, such as verbosity, boilerplate code, memory management, etc.
: R is a language and environment for statistical computing and graphics. R is an interpreted, functional, and dynamic language that runs on the R interpreter. R is a popular and widely used language for data analysis, visualization, machine learning, etc., but it also has some limitations, such as performance, memory usage, syntax, etc.
: JavaScript is a language for creating dynamic and interactive web pages. JavaScript is an interpreted, prototype-based, and scripting language that runs on the JavaScript engine. JavaScript is a flexible and expressive language that can create rich and engaging web applications, but it also has some challenges, such as compatibility, security, debugging, etc.
: Scala is a language that combines object-oriented and functional programming paradigms. Scala is a compiled, hybrid, and concise language that runs on the JVM. Scala is a modern and elegant language that can create scalable and reliable applications, but it also has some complexities, such as learning curve, syntax, libraries, etc.
: Anaconda is a distribution of Python that comes with many packages and tools for data science and machine learning. Anaconda is an integrated, cross-platform, and easy-to-use environment that runs on the Python interpreter. Anaconda is a comprehensive and convenient solution for data science and machine learning projects, but it also has some drawbacks, such as size, updates, compatibility, etc.
You can find more alternatives and comparisons with QPython in the .
Conclusion
In this article, I have shown you how to use QPython, a script engine that runs Python on Android devices. I have explained how to download and install QPython, how to write and execute Python code with QPython, how to use QPython features and libraries, and how to compare QPython with Python and some of its alternatives.
I hope you have found this article helpful and informative. If you want to learn more about QPython or Python in general, you can check out some of these resources:
: The official documentation of QPython that covers its features, libraries, modes, commands, etc.
: The official forum of QPython where you can ask questions, share ideas, report bugs, or request features.
: The official GitHub repository of QPython where you can find its source code, releases, issues, or contributions.
: The official documentation of Python that covers its syntax, grammar, data types, operators, control structures, etc.
: The official tutorial of Python that teaches you the basics and some advanced topics of Python.
: A website that provides free Python tutorials, exercises, quizzes, and projects for beginners.
Thank you for reading this article. I hope you have enjoyed it and learned something new. If you have any questions or feedback, please feel free to leave a comment below. I would love to hear from you. Happy coding!
FAQs
Here are some frequently asked questions about QPython:
What is QPython?
QPython is a script engine that runs Python on Android devices. It allows you to write and execute Python code, access Android APIs, create SL4A applications, install third-party Python libraries, and use QR code tools.
How do I install QPython?
You can install QPython from Google Play or from other sources such as GitHub or the official website. You can also choose between different branches of QPython that have different versions, permissions, features, etc.
How do I write and execute Python code with QPython?
You can write and execute Python code with QPython using three main modes: console mode, editor mode, and webapp mode. You can also use the QR code tools to transfer and share Python code with other devices or users.
What are some features and libraries that QPython offers?
QPython offers some features and libraries that make it more powerful and versatile than regular Python. You can use these features and libraries to access Android APIs, create SL4A applications, install third-party Python libraries, and use QR code tools.
How does QPython compare with Python and some of its alternatives?
QPython is based on Python, which means it uses the same syntax, grammar, data types, operators, control structures, etc., as regular Python. However, QPython also has some limitations and differences due to its nature as a script engine that runs on Android devices. QPython also has some features and libraries that make it more suitable and convenient for Android development and scripting. QPython also has some alternatives that you may want to consider or compare with QPython.
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