tinykernel - A minimal Python kernel so you can run Python in your Python

Related tags

Deep Learningpythonembeddedkernelipythonfastainbdevnbprocess
Overview

tinykernel

A minimal Python kernel, so you can run Python in your Python.

All the clever stuff in this library is provided by Python's builtin ast module and compilation/exec/eval system, along with IPython's CachingCompiler which does some deep magic. tinykernel just brings them together with a little glue.

Install

With pip:

pip install tinykernel

With conda:

conda install -c fastai tinykernel

How to use

This library provides a single class, TinyKernel, which is a tiny persistent kernel for Python code:

k = TinyKernel()

Call it, passing Python code, to have the code executed in a separate Python environment:

k("a=1")

Expressions return the value of the expression:

k('a')
1

All variables are persisted across calls:

k("a+=1")
k('a')
2

Multi-line inputs are supported. If the last line is an expression, it is returned:

k("""import types
b = types.SimpleNamespace(foo=a)
b""")
namespace(foo=2)

The original source code is stored, so inspect.getsource works and, tracebacks have full details.

k("""def f(): pass # a comment
import inspect
inspect.getsource(f)""")
'def f(): pass # a comment\n'

When creating a TinyKernel, you can pass a dict of globals to initialize the environment:

k = TinyKernel(glb={'foo':'bar'})
k('foo*2')
'barbar'

Pass name to customize the string that appears in tracebacks ("kernel" by default):

k = TinyKernel(name='myapp')
code = '''def f():
    return 1/0
print(f())'''
try: k(code)
except Exception as e: print(traceback.format_exc())
", line 5, in try: k(code) File "/home/jhoward/git/tinykernel/tinykernel/__init__.py", line 20, in __call__ if expr: return self._run(Expression(expr.value), nm, 'eval') File "/home/jhoward/git/tinykernel/tinykernel/__init__.py", line 12, in _run def _run(self, p, nm, mode='exec'): return eval(compiler(p, nm, mode), self.glb) File "", line 3, in print(f()) File "", line 2, in f return 1/0 ZeroDivisionError: division by zero "> 
Traceback (most recent call last):
  File "", line 5, in 
    try: k(code)
  File "/home/jhoward/git/tinykernel/tinykernel/__init__.py", line 20, in __call__
    if expr: return self._run(Expression(expr.value), nm, 'eval')
  File "/home/jhoward/git/tinykernel/tinykernel/__init__.py", line 12, in _run
    def _run(self, p, nm, mode='exec'): return eval(compiler(p, nm, mode), self.glb)
  File "", line 3, in 
    print(f())
  File "", line 2, in f
    return 1/0
ZeroDivisionError: division by zero

Acknowledgements

Thanks to Christopher Prohm, Matthias Bussonnier, and Aaron Meurer for their helpful insights in this twitter thread.

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