Embed (create) an interactive Python shell inside a Python program

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Is it possible to start an interactive Python shell inside a Python program?

I want to use such an interactive Python shell (which is running inside my program's execution) to inspect some program-internal variables.

The code module provides an interactive console:

import readline # optional, will allow Up/Down/History in the console
import code
variables = globals().copy()
variables.update(locals())
shell = code.InteractiveConsole(variables)
shell.interact()

1. Embedding Python in Another Application — Python 3.8.4rc1 , One of the things this main program has to do is initialize the Python interpreter. At the very least, you have to call the function Py_Initialize() . There are optional� Python's code module also provides an InteractiveInterpreter class, which will automatically evaluate expressions, just like Python Interactive Mode, but it is more complex to use with multiline input. InteractiveConsole.runcode accepts any arbitrary chunk of valid Python.

In ipython 0.13+ you need to do this:

from IPython import embed

embed()

Module: terminal.embed — IPython 7.16.1 documentation, If you are looking for an IPython version compatible with Python 2.7, please use the I. This is useful to permanently exit a loop that create IPython embed instance. program will then continue to run without the interactive shell interfering again. is created and not called, for example if you create a single instance in one� Show Emoji in Python code; for-else in Python indicating "value not found" Create your own interactive shell with cmd in Python; Traversing directory tree using walk in Python - skipping .git directory; Python: avoid importing everything using a star: * PIL, Pillow Create images with Python PIL and Pillow and write text on them; Python: get

I've had this code for a long time, I hope you can put it to use.

To inspect/use variables, just put them into the current namespace. As an example, I can access var1 and var2 from the command line.

var1 = 5
var2 = "Mike"
# Credit to effbot.org/librarybook/code.htm for loading variables into current namespace
def keyboard(banner=None):
    import code, sys

    # use exception trick to pick up the current frame
    try:
        raise None
    except:
        frame = sys.exc_info()[2].tb_frame.f_back

    # evaluate commands in current namespace
    namespace = frame.f_globals.copy()
    namespace.update(frame.f_locals)

    code.interact(banner=banner, local=namespace)


if __name__ == '__main__':
  keyboard()

However if you wanted to strictly debug your application, I'd highly suggest using an IDE or pdb(python debugger).

Embedded Python Shells — cmd2 1.1 documentation, Entered without arguments, it enters an interactive Python session. This wrapper provides access to execute commands in your cmd2 application while However, any local or global variable created within the ipy shell will not persist. Embeddable. You can call IPython as a python shell inside your own python programs. This can be used both for debugging code or for providing interactive abilities to your programs with knowledge about the local namespaces (very useful in debugging and data analysis situations). Easy debugger access.

Using IPython you just have to call:

from IPython.Shell import IPShellEmbed; IPShellEmbed()()

How to Embed an interactive Python interpreter console, There's a few things you can do with an interpreter in your app. The code so far is just boilerplate; it creates a class named Console that� If you're interested in learning a general purpose, high-powered programming language, Python might be the way to go. In this installment from his video tutorial series dedicated to programming in the Python programming language, you'll learn what's necessary to create an interactive program from a Linux shell.

Another trick (besides the ones already suggested) is opening an interactive shell and importing your (perhaps modified) python script. Upon importing, most of the variables, functions, classes and so on (depending on how the whole thing is prepared) are available, and you could even create objects interactively from command line. So, if you have a test.py file, you could open Idle or other shell, and type import test (if it is in current working directory).

Embedding IPython in other programs, It is possible to start an IPython instance inside your own Python programs. even in code which is itself being run at the IPython interactive prompt with '@run Shell import IPShellEmbed # Now create an instance of the embeddable shell. Agreed the heredoc approach can work. There are things to be careful about however: (1) if the heredoc marker (END in Ned's example) occurs in column 0 in the Python script, the heredoc will end early; (2) variations on heredoc marker (with or without leading -) affect whether tabs and spaces are preserved; and (3) syntactic overlap between Python and bash when variable expansion is turned on

Create your own interactive shell with cmd in Python, When writing an Command Line Interface for an application it could be nice to have an interactive shell with command completition and history. Execute Shell command in Python with os module. Let me create a simple python program that executes a shell command with the os module. import os myCmd = 'ls -la' os.system(myCmd) Now, if I run this program, here’s what I see in the output.

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How to Embed a Python Interpreter in Your Website?, Want to make your website more interactive? Embed a Python Type in the Python code you would like to embed on your website. Click the menu item� I want to be able to bring up an interactive python terminal from my python application. Some, but not all, variables in my program needs to be exposed to the interpreter. Currently I use a sub-classed and modified QPlainTextEdit and route all "commands" there to eval or exec , and keep track of a separate namespace in a dict.

Comments
  • You could use pdb, IDE debuggers, or print for that.
  • Note that vars is a built-in function. Also, in Python 3.5+, you can create a "compound" dictionary from two existing dictionaries using dict expansion: variables = {**globals(), **locals()}.
  • @kyrill Fixed the former point. Since there still is a significant number of Python<3.5 users, I'll keep the dictionary compounding as is for now.
  • is it possible to wrap or enclose the interactiveconsole within a widget in PyQt5?
  • @Ash That sounds like a great question (although you probably only need an interactive console, not necessarily this specific module). Go ahead and ask it!
  • @phihag: readline doesen't seems to exist anymore. Is the up/down/history feature still avaiable through some standard library?
  • In fact, you should use import IPython; IPython.embed();. See this issue.
  • Yeah that is what I use today too, 3 years later =)
  • A similar approach that would place the script's globals in the global namespace instead of a module namespace: exec(open("test.py").read())