Develop Reference

How do I switch from Python2 to Python3 in Sublime Text

When I try running python script in (CTRL-B or CMD-B) Sublime Text, it runs the script in Python2. but how can I run my script in Python3 in Sublime Text?

First, go to Tools > Build System > New Build System..., this will open a new file called untitled.sublime-build. In this file, you need copy-paste/type this:
{
"cmd": ["python3.6", "-i", "-u", "$file"],
"file_regex": "^[ ]File \"(...?)\", line ([0-9]*)",
"selector": "source.python"
}
Now, on my system, I have my PATH configured so the command python3.6 runs Python 3.6.4. Your installation may differ, so you have to change that bit to how you run Python 3 on your system. You can use either the full absolute path to the interpreter or the command you use from the command line to run Python 3.
After you've done that, save the file as Python3.sublime-build in the folder Sublime suggests and you should be ready to go. You can use the options in Tools > Build System to change build systems manually, but Sublime should suggest this build whenever you open a Python file from now on.

How do I make Sublime Text 3 run Python 3 instead of Python 2? [duplicate]

My question is, can Sublime 3 be setup to run the code that has been written with in Sublime. I've have searched on here and the internet and have tried numerous different suggestions. If the answer has already been posted and someone could point me in the proper direction / URL I'd appreciate it. If it cannot be done and you have other suggestion's I'll give it a try.

The following steps do work for Sublime Text 2 and 3. What you need is a so-called Sublime Text Build System which is represented by a valid JSON text file. There are a lot of Q and A to this topic on the internet. Anyway, here is a step-by-step list.
FYI: As far as I know there is no updated Syntax file for Python3.5 for Sublime Text. If anyone knows of an update, please let me know in the comment section.
Mac and Linux:
Open Sublime Text
In the menu bar go to Tools -> Build-System -> New Build System
Paste the following code-snippet to the new opened file. Verify that the path to your python 3.5 installation is correct, otherwise see step 4.
{
"cmd": ["/Library/Frameworks/Python.framework/Versions/3.5/bin/python3", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
If you don't know the location of Python 3 try to execute 'which python3' in your terminal. Also verify that the correct python3 command is in your search-path. Here is some example output:
/Library/Frameworks/Python.framework/Versions/3.5/bin/python3
Save the file using (e.g using cmd (⌘) + s on your keyboard) and enter a filename like Python-3.5.sublime-build.
Now you can switch to your new build-system. By using (cmd + b) you can execute your Python script now.
Windows:
Open Sublime Text
In the menu bar go to Tools -> Build-System -> New Build System
Paste the following code-snippet to the new opened file. You need to verify that the path to python.exe is correct, otherwise update it.
{
"cmd": [r"C:\Python35\python.exe", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
Save the file using (e.g using CTRL + s on your keyboard) and enter a filename like Python-3.5.sublime-build.
Now you can switch to your new build-system. By using (CTRL + b) you can execute your Python script now.

For python 3.6 i'm using:
{
"cmd": ["/usr/local/bin/python3.6", "$file"]
}
And everything works fine! Don't forget to get full path to your python interpreter.

Yes sublime can execute code in python3.
Sublime text executes the python file using system python available.
All you need to do is make python3 is default in your system. You can do this by adding setting PATH variable to point to python3.
To execute code:
Tools -> Build
CMD + B
Refer here How do I run Python code from Sublime Text 2?

By using the following code:
{
"cmd": ["/usr/local/bin/python3", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
would make the Sublime work.
Save the file as python3.sublime-build then select it in Tools -> build system -> Python3.
At last, run it by pressing command + B.

How to run a Python program in Sublime Text without using command line [duplicate]

I want to set up a complete Python IDE in Sublime Text 2.
I want to know how to run the Python code from within the editor. Is it done using build system? How do I do it ?

Tools -> Build System -> (choose) Python then:
To Run:
Tools -> Build
-or-
Ctrl + B
CMD + B (OSX)
This would start your file in the console which should be at the bottom of the editor.
To Stop:
Ctrl + Break or Tools -> Cancel Build
Fn + C (OSX)
You can find out where your Break key is here: http://en.wikipedia.org/wiki/Break_key.
Note: CTRL + C will NOT work.
What to do when Ctrl + Break does not work:
Go to:
Preferences -> Key Bindings - User
and paste the line below:
{"keys": ["ctrl+shift+c"], "command": "exec", "args": {"kill": true} }
Now, you can use ctrl+shift+c instead of CTRL+BREAK

Edit %APPDATA%\Sublime Text 2\Python\Python.sublime-build
Change content to:
{
"cmd": ["C:\\python27\\python.exe", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
change the "c:\python27" part to any version of python you have in your system.

On Mac OS X, save your file with a .py extension. Press ⌘ + B. It runs in a window below.

To RUN press CtrlB (answer by matiit)
But when CtrlB does not work, Sublime Text probably can't find the Python Interpreter. When trying to run your program, see the log and find the reference to Python in path.
[cmd: [u'python', u'-u', u'C:\\scripts\\test.py']]
[path: ...;C:\Python27 32bit;...]
The point is that it tries to run python via command line, the cmd looks like:
python -u C:\scripts\test.py
If you can't run python from cmd, Sublime Text can't too.
(Try it yourself in cmd, type python in it and run it, python commandline should appear)
SOLUTION
You can either change the Sublime Text build formula or the System %PATH%.
To set your %PATH%:
*You will need to restart your editor to load new %PATH%
Run Command Line* and enter this command: *needs to be run as administrator
SETX /M PATH "%PATH%;<python_folder>"
for example: SETX /M PATH "%PATH%;C:\Python27;C:\Python27\Scripts"
OR manually: (preferable)
Add ;C:\Python27;C:\Python27\Scripts at the end of the string.
To set the interpreter's path without messing with System %PATH% see this answer by ppy.

You can use SublimeREPL (you need to have Package Control installed first).

If using python 3.x you need to edit the Python3.sublime-build
(Preferences > Browse packages > Python 3)
to look like this:
{
"path": "/usr/local/bin",
"cmd": ["python3", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}

[ This applies to ST3 (Win), not sure about ST2 ]
To have the output visible in Sublime as another file (+ one for errors), do this:
Create a new build system: Tools > Build Systems > New Build System...
Use the following configuration:
{
"cmd": ["python.exe", "$file", "1>", "$file_name.__STDOUT__.txt", "2>", "$file_name.__STDERR__.txt"],
"selector": "source.python",
"shell": true,
"working_dir": "$file_dir"
}
For your Python file select the above build system configuration file: Tools > Build Systems > {your_new_build_system_filename}
ctrl + b
Now, next to your file, e.g. "file.py" you'll have "file.__STDOUT__.py" and "file.__STDERR__.py" (for errors, if any)
If you split your window into 3 columns, or a grid, you'll see the result immediately, without a need to switch panels / windows

In python v3.x you should go to : Tools->Build System->New Build System.
Then, it pop up the untitled.sublime-build window in sublime text editor.Enter setting as:
{
"cmd": ["path_to_the_python.exe","-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
To see the path, Type following in terminal as:
python
>>> import sys
>>>print(sys.executable)
You can make more than one Build System but it should default save inside Packages of Sublime text with .sublime-build extension.
Then, select the new Build System and press cltr+b or other based on your os.

Cool U guys, I just found this:
http://ptomato.wordpress.com/2012/02/09/geek-tip-running-python-guis-in-sublime-text-2/
It explains (like one of the answers above) how to edit this exec.py in the default directory.
I had the problem that my PYTHON UI APPLICATION would not start. I commented out the last line from the following snipped:
# Hide the console window on Windows
startupinfo = None
if os.name == "nt":
startupinfo = subprocess.STARTUPINFO()
#startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
and, taaadaaaa, I could start my app by pressing Ctrl+B. Funny line anyways, uh? And a big thank you to whoever wrote that article ;-)

I solved this problem :
> Preferences –> Browse Packages –> Default
Open the exec.py file, near line 41-42, the code should look like this :
for k, v in proc_env.iteritems():
proc_env[k] = os.path.expandvars(v).encode(sys.getfilesystemencoding())
then delete it or edit it as :
try:
for k, v in proc_env.iteritems():
proc_env[k] = os.path.expandvars(v).encode(sys.getfilesystemencoding())
except:
print 'foobar'

I ran into the same problem today. And here is how I managed to run python code in Sublime Text 3:
Press Ctrl + B (for Mac, ⌘ + B) to start build system. It should execute the file now.
Follow this answer to understand how to customise build system.
What you need to do next is replace the content in Python.sublime-build to
{
"cmd": ["/usr/local/bin/python", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python",
}
You can of course further customise it to something that works for you.

seems the Ctrl+Break doesn't work on me, neither the Preference - User...
use keys, Alt → t → c

You can access the Python console via “View/Show console” or Ctrl+`.

I had the same problem. You probably haven't saved the file yet. Make sure to save your code with .py extension and it should work.

One thing to note about the aforementioned build system: you can write (and use) custom .sublime-build files or even per project build_systems clause (in your project settings). This allows you to do useful things like a fancy test runner with ANSI colors output.
For even more "full IDE" features, you can use the excellent SublimePythonIDE package:
code completion (intel)
jump to definition & object description
proper linting/pep8
supports different interpreters with virtualenv
Disclosure: I've contributed a PR to that package, and I use it all the time, but there are others.

Use a real python console alongside Sublime
Both Sublime's build system and SublimeREPL (the answers above) are limited in that you can't easily interact with the workspace variables after you run your file.
If you want to run a script, then work in a REPL-like fashion (like you would in an IDE), then I recommend having Sublime open alongside an IPython console. Using AutoHotKey (Windows) or AutoKey (Linux), you can set this up such that a single shortcut will copy the filename (or just the selected code) and then paste this in the console to run the file.
Detailed instructions for Linux or Windows

Running Code with Python 3.5.0 + Sublime 3.0 on Mac

My question is, can Sublime 3 be setup to run the code that has been written with in Sublime. I've have searched on here and the internet and have tried numerous different suggestions. If the answer has already been posted and someone could point me in the proper direction / URL I'd appreciate it. If it cannot be done and you have other suggestion's I'll give it a try.

The following steps do work for Sublime Text 2 and 3. What you need is a so-called Sublime Text Build System which is represented by a valid JSON text file. There are a lot of Q and A to this topic on the internet. Anyway, here is a step-by-step list.
FYI: As far as I know there is no updated Syntax file for Python3.5 for Sublime Text. If anyone knows of an update, please let me know in the comment section.
Mac and Linux:
Open Sublime Text
In the menu bar go to Tools -> Build-System -> New Build System
Paste the following code-snippet to the new opened file. Verify that the path to your python 3.5 installation is correct, otherwise see step 4.
{
"cmd": ["/Library/Frameworks/Python.framework/Versions/3.5/bin/python3", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
If you don't know the location of Python 3 try to execute 'which python3' in your terminal. Also verify that the correct python3 command is in your search-path. Here is some example output:
/Library/Frameworks/Python.framework/Versions/3.5/bin/python3
Save the file using (e.g using cmd (⌘) + s on your keyboard) and enter a filename like Python-3.5.sublime-build.
Now you can switch to your new build-system. By using (cmd + b) you can execute your Python script now.
Windows:
Open Sublime Text
In the menu bar go to Tools -> Build-System -> New Build System
Paste the following code-snippet to the new opened file. You need to verify that the path to python.exe is correct, otherwise update it.
{
"cmd": [r"C:\Python35\python.exe", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
Save the file using (e.g using CTRL + s on your keyboard) and enter a filename like Python-3.5.sublime-build.
Now you can switch to your new build-system. By using (CTRL + b) you can execute your Python script now.

For python 3.6 i'm using:
{
"cmd": ["/usr/local/bin/python3.6", "$file"]
}
And everything works fine! Don't forget to get full path to your python interpreter.

Yes sublime can execute code in python3.
Sublime text executes the python file using system python available.
All you need to do is make python3 is default in your system. You can do this by adding setting PATH variable to point to python3.
To execute code:
Tools -> Build
CMD + B
Refer here How do I run Python code from Sublime Text 2?

By using the following code:
{
"cmd": ["/usr/local/bin/python3", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
would make the Sublime work.
Save the file as python3.sublime-build then select it in Tools -> build system -> Python3.
At last, run it by pressing command + B.

How do I run Python code from Sublime Text 2?

I want to set up a complete Python IDE in Sublime Text 2.
I want to know how to run the Python code from within the editor. Is it done using build system? How do I do it ?

Tools -> Build System -> (choose) Python then:
To Run:
Tools -> Build
-or-
Ctrl + B
CMD + B (OSX)
This would start your file in the console which should be at the bottom of the editor.
To Stop:
Ctrl + Break or Tools -> Cancel Build
Fn + C (OSX)
You can find out where your Break key is here: http://en.wikipedia.org/wiki/Break_key.
Note: CTRL + C will NOT work.
What to do when Ctrl + Break does not work:
Go to:
Preferences -> Key Bindings - User
and paste the line below:
{"keys": ["ctrl+shift+c"], "command": "exec", "args": {"kill": true} }
Now, you can use ctrl+shift+c instead of CTRL+BREAK

Edit %APPDATA%\Sublime Text 2\Python\Python.sublime-build
Change content to:
{
"cmd": ["C:\\python27\\python.exe", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
change the "c:\python27" part to any version of python you have in your system.

On Mac OS X, save your file with a .py extension. Press ⌘ + B. It runs in a window below.

To RUN press CtrlB (answer by matiit)
But when CtrlB does not work, Sublime Text probably can't find the Python Interpreter. When trying to run your program, see the log and find the reference to Python in path.
[cmd: [u'python', u'-u', u'C:\\scripts\\test.py']]
[path: ...;C:\Python27 32bit;...]
The point is that it tries to run python via command line, the cmd looks like:
python -u C:\scripts\test.py
If you can't run python from cmd, Sublime Text can't too.
(Try it yourself in cmd, type python in it and run it, python commandline should appear)
SOLUTION
You can either change the Sublime Text build formula or the System %PATH%.
To set your %PATH%:
*You will need to restart your editor to load new %PATH%
Run Command Line* and enter this command: *needs to be run as administrator
SETX /M PATH "%PATH%;<python_folder>"
for example: SETX /M PATH "%PATH%;C:\Python27;C:\Python27\Scripts"
OR manually: (preferable)
Add ;C:\Python27;C:\Python27\Scripts at the end of the string.
To set the interpreter's path without messing with System %PATH% see this answer by ppy.

You can use SublimeREPL (you need to have Package Control installed first).

If using python 3.x you need to edit the Python3.sublime-build
(Preferences > Browse packages > Python 3)
to look like this:
{
"path": "/usr/local/bin",
"cmd": ["python3", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}

[ This applies to ST3 (Win), not sure about ST2 ]
To have the output visible in Sublime as another file (+ one for errors), do this:
Create a new build system: Tools > Build Systems > New Build System...
Use the following configuration:
{
"cmd": ["python.exe", "$file", "1>", "$file_name.__STDOUT__.txt", "2>", "$file_name.__STDERR__.txt"],
"selector": "source.python",
"shell": true,
"working_dir": "$file_dir"
}
For your Python file select the above build system configuration file: Tools > Build Systems > {your_new_build_system_filename}
ctrl + b
Now, next to your file, e.g. "file.py" you'll have "file.__STDOUT__.py" and "file.__STDERR__.py" (for errors, if any)
If you split your window into 3 columns, or a grid, you'll see the result immediately, without a need to switch panels / windows

In python v3.x you should go to : Tools->Build System->New Build System.
Then, it pop up the untitled.sublime-build window in sublime text editor.Enter setting as:
{
"cmd": ["path_to_the_python.exe","-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python"
}
To see the path, Type following in terminal as:
python
>>> import sys
>>>print(sys.executable)
You can make more than one Build System but it should default save inside Packages of Sublime text with .sublime-build extension.
Then, select the new Build System and press cltr+b or other based on your os.

Cool U guys, I just found this:
http://ptomato.wordpress.com/2012/02/09/geek-tip-running-python-guis-in-sublime-text-2/
It explains (like one of the answers above) how to edit this exec.py in the default directory.
I had the problem that my PYTHON UI APPLICATION would not start. I commented out the last line from the following snipped:
# Hide the console window on Windows
startupinfo = None
if os.name == "nt":
startupinfo = subprocess.STARTUPINFO()
#startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
and, taaadaaaa, I could start my app by pressing Ctrl+B. Funny line anyways, uh? And a big thank you to whoever wrote that article ;-)

I solved this problem :
> Preferences –> Browse Packages –> Default
Open the exec.py file, near line 41-42, the code should look like this :
for k, v in proc_env.iteritems():
proc_env[k] = os.path.expandvars(v).encode(sys.getfilesystemencoding())
then delete it or edit it as :
try:
for k, v in proc_env.iteritems():
proc_env[k] = os.path.expandvars(v).encode(sys.getfilesystemencoding())
except:
print 'foobar'

I ran into the same problem today. And here is how I managed to run python code in Sublime Text 3:
Press Ctrl + B (for Mac, ⌘ + B) to start build system. It should execute the file now.
Follow this answer to understand how to customise build system.
What you need to do next is replace the content in Python.sublime-build to
{
"cmd": ["/usr/local/bin/python", "-u", "$file"],
"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
"selector": "source.python",
}
You can of course further customise it to something that works for you.

seems the Ctrl+Break doesn't work on me, neither the Preference - User...
use keys, Alt → t → c

You can access the Python console via “View/Show console” or Ctrl+`.

I had the same problem. You probably haven't saved the file yet. Make sure to save your code with .py extension and it should work.

One thing to note about the aforementioned build system: you can write (and use) custom .sublime-build files or even per project build_systems clause (in your project settings). This allows you to do useful things like a fancy test runner with ANSI colors output.
For even more "full IDE" features, you can use the excellent SublimePythonIDE package:
code completion (intel)
jump to definition & object description
proper linting/pep8
supports different interpreters with virtualenv
Disclosure: I've contributed a PR to that package, and I use it all the time, but there are others.

Use a real python console alongside Sublime
Both Sublime's build system and SublimeREPL (the answers above) are limited in that you can't easily interact with the workspace variables after you run your file.
If you want to run a script, then work in a REPL-like fashion (like you would in an IDE), then I recommend having Sublime open alongside an IPython console. Using AutoHotKey (Windows) or AutoKey (Linux), you can set this up such that a single shortcut will copy the filename (or just the selected code) and then paste this in the console to run the file.
Detailed instructions for Linux or Windows