忽略 python 中的 IPython 魔法

Question

What is the best way to ignore IPython magic when running scripts using the python interpreter?

I often include IPython magic in my script files because it work with the code interactively. For example, with the autoreload magic, I don't have to keep reload -ing the modules after I make some changes and fix bugs:

%load_ext autoreload
%autoreload 2

However, when I try to run this script using a usual python interpreter, I get an error:

  File "<string>", line 1
    %load_ext autoreload
    ^
SyntaxError: invalid syntax

Wrapping IPython magic inside an if statement does not work, because incorrect syntax is detected before the file is actually ran.

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So what is the best way to get python to ignore IPython magic?

It's annoying to have to change your scripts whenever you want to run then in python, pdb, sphinx, etc.

Answer 1

For all tools that can read from standard input you could use grep to remove any magic lines and pipe the result into python:

grep -v '^%' magicscript.ipy | python

Works well as a bash alias:

alias pynomagic='( grep -v "^%" | python ) < '
pynomagic magicscript.ipy

Tools like pdb that only accept filenames could be called like this (bash again):

pdb <(grep -v '^%' magicscript.ipy)

Answer 2

You should load such magic in your config file, not in your scripts! It is just not valid Python.

Put the following in your ~/.ipython/profile_default/ipython_config.py :

c = get_config()
c.InteractiveShellApp.extensions = ['autoreload']
c.InteractiveShellApp.exec_lines = ['%autoreload 2']
c.InteractiveShellApp.exec_lines.append('print("Warning: disable autoreload in ipython_config.py to improve performance.")')

Answer 3

1. Create a template file named simplepython.tpl . Copy the below statements.

    {% extends 'python.tpl'%} {% block codecell %} {{ super().replace('get_ipython','#get_ipython') if "get_ipython" in super() else super() }} {% endblock codecell %} 

2. Save simplepython.tpl .

3. Type in command line:

   jupyter nbconvert --to python 'IPY Notebook' --template=simplepython.tpl --stdout

Answer 4

In case this helps anyone.

At least for Databricks, when syncing a notebook with a .py file in Github, a magic function can be specified with a specially formatted comment. Like this:

# MAGIC %run ./my_external_file

Answer 5

Spyder gives warning (as given in the picture below), when a coder use this type of code and says that it is not a valid Python code.

So, in order to use IPython magics, saving files with the.ipy extension may be a solution.

Spyder screenshot