I'm using IPython as a system shell.
Is there a way to make IPython to raise an exception when the shell command fails? (non-zero exit codes)
The default makes them fail silently.
2 Answers
If you use ! to execute shell commands, errors will pass silently
!echo "hello" && exit 1
hello
If you use the %%sh cell magic to execute the shell command, errors will raise:
%%sh
echo "hello" && exit 1
hello
---------------------------------------------------------------------------
CalledProcessError Traceback (most recent call last)
<ipython-input-10-9229f76cae28> in <module>
----> 1 get_ipython().run_cell_magic('sh', '', 'echo "hello" && exit 1\n')
~/anaconda/envs/altair-dev/lib/python3.6/site-packages/IPython/core/interactiveshell.py in run_cell_magic(self, magic_name, line, cell)
2360 with self.builtin_trap:
2361 args = (magic_arg_s, cell)
-> 2362 result = fn(*args, **kwargs)
2363 return result
2364
~/anaconda/envs/altair-dev/lib/python3.6/site-packages/IPython/core/magics/script.py in named_script_magic(line, cell)
140 else:
141 line = script
--> 142 return self.shebang(line, cell)
143
144 # write a basic docstring:
<decorator-gen-110> in shebang(self, line, cell)
~/anaconda/envs/altair-dev/lib/python3.6/site-packages/IPython/core/magic.py in <lambda>(f, *a, **k)
185 # but it's overkill for just that one bit of state.
186 def magic_deco(arg):
--> 187 call = lambda f, *a, **k: f(*a, **k)
188
189 if callable(arg):
~/anaconda/envs/altair-dev/lib/python3.6/site-packages/IPython/core/magics/script.py in shebang(self, line, cell)
243 sys.stderr.flush()
244 if args.raise_error and p.returncode!=0:
--> 245 raise CalledProcessError(p.returncode, cell, output=out, stderr=err)
246
247 def _run_script(self, p, cell, to_close):
CalledProcessError: Command 'b'echo "hello" && exit 1\n'' returned non-zero exit status 1.
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