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I decided recently that I want to start learning to code. I chose python as my first language because of it's versatility and Open Source connections. Now, of course to learn any programming language, first you have to be able to practice with it by writing code and running it.
I have Python beginner tutorials I am using but as soon as I got to the point where I wanted to run a simple Hello World message, I couldn't figure out how to get my document to actually RUN. I downloaded LiClipse with the hopes of using PyDev. I read that you can run a code directly from PyDev.
Wow, what a confusing mess! I downloaded the instant install version of LiClipse and I had to manually update the pip because it was out of date and that took an hour of research all on it's own to figure out how to do it.
Now that I have the interpreter set up correctly with the most recent pip...(I THINK), when I try to run any code I write, it doesn't let me. It wants me to save it first, which of course is quite logical. But when I try to save it, it says there is no folders to save to. How can there be no folders? I have been reading the install help, but it doesn't say anything about this issue. Or maybe it did explain how to fix this issue and I simply didn't understand all the jargon included in the configuration documentation. It kept instructing me to do technical things I couldn't understand.
Can anyone tell me what is going on? Shouldn't this all be ready to go when I used the "instant install" ?? I am just a beginner here, I don't know all this technical installation jargon. If anyone can help me get this setup, please let me know.
I really want to start learning. But I can't if I don't have the right tools.
Yeah, the technical jargon can be really confusing in the beginning. I've never heard of LiClipse but I can give you a few tips to get started:
Use a good IDE or Editor. For beginning VsCode with the Python PlugIn is quite good. You can also use PyCharm (the free version is enough) but that IDE is quite confusing.
Get comfortable with the commandline. On Windows you can invoke Python by running py on Linux with python3. You open the commandline on Windows by opening the startmenu, entering cmd and hitting enter.
You will have to make sure Python is in your "PATH" enviroment variable. That is a variable telling the Operating System where to find your programms. It should have asked you whether you want to add Python to your PATH during the install.
You run your python programm by saving it as a .py file and running py <filename.py> or python3 <filename.py> on Windows or linux respectively. You have to be in the directory where you saved your file of course.
I hope I could help you. Please mark this answer as accepted if it did answer your question or helped you with your issue.
I want to start by saying I'm mainly experienced in C & C++, not Python, but with programming in general many of the concepts carry over. I also don't have enough rep to comment, or I'd ask for some clarification on how familiar you are with the commandline.
I'm going to assume you're on Windows since you didn't mention the platform.
I wrote this like a tutorial, because I found those to be very helpful when I first started programming.
I can't recommend this enough, start off by using the commandline!
I think you complicated things more by searching for a text editor that can also run code. In order to get something like that working for your setup you need to know what's happening behind-the-scenes first.
Once you have a grasp of how to write & execute Python code, then you can move on to an IDE or advanced text editor like Visual Studio Code or LiClipse with confidence.
R+Click on the Start Menu, then click on Windows PowerShell to open a terminal.
Take a moment to note the filepath shown before the blinking cursor.
This is known as the Working Directory, which works similar to how the file explorer only allows you to "view" one directory at any given time; You can open multiple explorer windows side-by-side, but you can't view multiple directories at the same time in a single window.
You can run commands by typing them and pressing Enter.
You can also use the Tab key to autocomplete things like directory/file names, commands, etc. after typing a few characters.
Now let's create a workspace directory for your first project.
This can be anywhere that you choose, but for the sake of simplicity I'll be using my User directory which is usually where PowerShell will start by default.
To create a new directory named _workspace, use the mkdir (Make Directory) command like so:
mkdir _workspace
Now let's change our working directory to _workspace by using the cd (Change Directory) command like so:
cd _workspace
This directory is empty, but if you want to view the contents of a directory you can use the ls (List Directory) command:
ls
Since this is an empty directory, nothing will happen.
Next, we'll create a Python script file using the touch command, which creates empty files:
touch HelloWorld.py
Now that we have a script file, open HelloWorld.py in Notepad by running this command:
notepad HelloWorld.py
If you use a dark desktop theme, now is the time when your retinas may be seared out by the intensity of Notepad's white color scheme.
Now, let's add the code to print "Hello World!" in Python:
print("Hello World!")
Once you're done, you can save & close Notepad to save your retinas.
Now it's time to run the program! In the PowerShell window, enter this command:
py HelloWorld.py
which will show:
Hello World!
If you see an error saying this:
The term 'py' is not recognized as the name of a cmdlet, function, script file, or operable program.
You should re-install Python and make sure you check this box in the installer:
After re-installing Python and checking the Add to PATH box, close and reopen the PowerShell window, enter the cd _workspace command again, followed by py HelloWorld.py, which should be successful this time.
I hope I could be of some help, if so, I'd greatly appreciate marking this answer as accepted so I can write comments. Happy coding!
If you are using Linux following will work.
Install python3 first (Its better to stuck on python3 now. Once you get use-to then you can code in python2.7 also.)
Open a terminal, go the folder contains your code. If your source code is in hello.py then type python3 hello.py on terminal. It will execute and print the output on terminal.
The suggestions given by both #radj and #C. Dautermann are excellent.
Like others here, I will be assuming that you are on Windows.
Before jumping into LiClipse and PyDev, I highly recommend making sure that Python and packages (such as pip) are functioning on their own first. Command line is a great tool for this.
Windows Command Line can be accessed in a variety of ways, one of which is to go to your start menu and search "cmd." Command Prompt should return. In the command prompt, run the following:
python
This should return the version of Python installed on your machine if it is configured properly. For example, you may see the following:
Python 3.10.1 (...)[...] on win32
If this does not appear, I recommend uninstalling Python and reinstalling. In the installer, you will want to check the "Add Python ... to PATH" option. This will configure your environment variables on your machine. If you plan on running multiple versions of Python down the road, don't worry; you can use batch files to set the PATH variable to another version.
Once you have Python working, your command prompt will lead with the following:
>>>
Notice that there is no longer a file path followed by >>. This is because you are now in the Python interpreter. Congratulations!
To exit the Python interpreter, enter Ctrl+Z. It should appear as the following:
^Z
After we know Python works, we will check to see that pip works. Ensure you have pip installed by entering the following:
python -m pip --version
You should then be able to see the pip version. For example:
pip 22.0.3 from C:\...
If pip is not working, you can consult this documentation on pip to make sure pip gets installed properly.
Once pip is working, again, congratulations! You've gotten over some of the biggest hurdles. At this point, you can open up any text editor, type in:
print('Hello World!')
save the file with the extension .py, then run the script through command prompt. To run a script through the command line, you have to cd to the file location, then run the script with python, like so:
cd filepath
python filename.py
Where filepath is the path to the Python file and filename is the name of the file. For example:
cd C:\Users\name\Documents\PythonPractice
python helloworld.py
Usually, command line is all that is needed when starting out with Python outside of a text editor. Notepad comes standard on Windows computers, but there are plenty of other editors out there. Sublime text and Notepad++ are some of my favorites, personally.
Now, if you're able to run everything prior, the good news is that your Python and pip are both working, and you have everything you need to get started learning Python. If Python and/or pip are not functioning, there's thankfully a huge body of troubleshooting tips out there.
Unfortunately, from what I get of your initial post, you might be struggling with configuring LiClipse. I personally do not use LiClipse, nor do I use PyDev, so my help at this point may be limited. You may want to uninstall and reinstall after confirming your Python and pip work as a first step. After that, perhaps check that you are following the practices outlined in the LiClipse manual. Worst case scenario, you can try a different version of Python (I believe it has some Python3 incompatibilities), try running PyDev independent of LiClipse, or look at a different tool. If you believe the problem lies with file locations/existence, I would look at radj's post or play around in File Explorer to see what is going on for yourself.
Again, to get familiar with Python, you don't even need these extra tools. All you need is a text editor and the command line to get started.
Some other tools to help you get started:
PyPI
A venv virtual environment tutorial
PyDev
A comparison of LiClipse alternatives in case you continue to struggle
Hope this helps. Happy Coding!
I am trying to run Pharo on my system (Ubuntu 17.10 64bit).I followed the exact procedure as given in the book Pharo By Example.
I Went into the Pharo6.1-64 directory and ran the following command in the terminal
./pharo shared/pharo6.1-64.image
I expected this to open the Pharo window where I can write code but instead saw this error in the Terminal.
./pharo: line32: /home/user/pharo6.1-64/vm/pharo: No such file or directory.
Do I need to download any additional files ?
I downloaded the zip from here and it said just extract and run.
It looks like there is something wrong with the file you downloaded. It does not seem to contain a vm. For now, try the other method mentioned in the book:
wget -O- get.pharo.org/50+vm | bash
Copy the pharo.image and pharo.changes to the directory containing the pharo executable and from terminal run the command
Pharo_executable path_to_Pharo_image
I have installed ruby using rbenv. I am using sublime text 3 and a Linux Mint 17.1 system. I am trying to build a program using control-b. When I do this I get the following message:
/bin/bash: ruby: command not found
[Finished in 0.0s with exit code 127]
[shell_cmd: ruby "/home/christopher/projects/hello.rb"]
[dir: /home/christopher/projects]
[path: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr /games:/usr/local/games]
When I check my path using my terminal, I get the following:
/home/christopher/.rbenv/shims:/home/christopher/.rbenv/bin:/usr/local /sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
How do I get my paths to line up?
Looking a long time for a solution to this I found the script "Pathway" that gave me an idea how to fix this.
I ended adding the following Pathway.py file to ~/Library/Application\ Support/Sublime\ Text\ 3/Packages/User to set a fixed ruby version managed by rbenv for all my sublime sessions:
import os
import subprocess
HOME = '/Users/my_user' # <== Change this accordingly
RBENV = '/.rbenv/versions/2.5/bin' # <== Choose version from ~/.rbenv/versions
# Sublime's default path is
# /usr/bin:/bin:/usr/sbin:/sbin
os.environ['PATH'] = HOME + RBENV + ':' + os.environ['PATH']
print('[Pathway] now the PATH is = ' + os.environ['PATH'])
print('[Pathway] sublime now uses', subprocess.check_output(["which", "ruby"]))
Now I have a deterministic and controllable ruby version to run things in sublime 🙂
So for "rbenv", your ruby executable is probably at "~/.rbenv/shims/ruby". But check! (On linux, in the directory you'll be working in, at the prompt, type "which ruby".)
The default Ruby SublimeText 3 Build system may not point to the right place.
At least that's what I think the problem was for me.
Issue is, while you can (maybe should) define a new build system for Ruby, for me, that meant two Ruby build systems, as I could not figure out what to do with the old built in one.
You can change the old one easily by installing package "PackageResourceViewer" and then restarting sublime, and then command (shift-ctrl-p on linux) "PackageResourceViewer:OpenResource" and search for "Ruby", then look for the Build system. Note I commented out stuff, and left good notes in case I need to revert.
I presume that when I next install ST3, this will be overwritten. Adding a new build system, or working with path or something is probably a better approach, but I already took to much time on this.
References
Building Ruby and Using RVM
SublimeText 3 Ruby Build Error
I'm just staring out with Ruby. I followed a tutorial to set up Ruby environment on my Mac OS. Then, I created a file named 'personal_chef.rb' in Sublime Text and saved it to a folder I created. Next went to IRB and tried "load 'personal_chef.rb'" and got the error:
-bash: load: command not found
I think it might have to do with how I switched my PATH when installing a new version of git during Environment setup. (I did that by following their instructions and typing: 'echo 'export PATH="/usr/local/bin:/usr/local/sbin:~/bin:$PATH"' >> ~/.bash_profile').
Can someone please help explain what is happening and how I can fix it? Basically I want to be able to create a file in Sublime Text, save it, then load it in IRB.
(I am running Mac OS 10.7.5, using Sublime Text 2.0.2 and using Terminal.app for IRB).
Thanks!
This is how you load the file:
First, make sure you enter the irb command from within the same directory you saved 'personal_chef.rb'.
This means that if you saved it to your desktop, you would type ~/desktop
You'll know you're in irb if your command line beings with irb(main)
Next simply type load 'personal_chef.rb'
If you successfully loaded the file the load method will return true.
I never used ruby before, I just wanted to play around with HAML and SASS. I downloaded and installed Ruby's Windows installer (v1.9.1). Then, I clicked ruby.exe (the icon with a black window and a multicolored gem in the picture). Finally, I typed gem install haml and pressed Enter. But nothing happened. Am I doing something wrong?
Reference picture:
alt text http://img707.imageshack.us/img707/9863/haml.png
You might need to put the path to Ruby into the PATH environment variable to do this, but this is how I do it:
I open up the command line utility. I then type ruby -S gem install <whatever>. This works like a charm.
I tried running Ruby and it shows a blank screen but lets me type code. When I press CTRL + C to cancel it then executes my code as well. Maybe you need to do that in the manner you are trying to right now. I just find it easier to just ruby -S <statement> instead. IronRuby gives me the REPL no problems though.
ruby.exe is the Ruby interpreter. If you want to type code into it, you obviously need to type Ruby code into it, not DOS command code.
The gem command is a DOS batch file (gem.bat). DOS batch files need to be run from the DOS command interpreter.
Installing Ruby using RubyInstaller, you get an shortcut in the Programs menu that let you open a command prompt with Ruby in the PATH
You use that in case you didn't select the option to add Ruby to the PATH.
Either case, the gem command you typed in should be entered at the command prompt, and not inside Ruby itself.
The latest build (rubyinstaller-1.9.2-p136.exe) had a problem. Rename the folder: c:\ruby192\lib\ruby\site_ruby or delete it altogether and this fixes "gem"
You can do "gem install compass" or if you're behind a proxy you might need to do.
gem install –http-proxy compass
Here's a blog post with all the details:
http://francisshanahan.com/index.php/2011/how-to-theme-sencha-touch-sass-windows/
Hope that helps,
-fs
this is how i installed ruby and sass on my windows machine: How to install ruby and sass on windows?