Magic commands tips¶
In this section some solutions for JupyterLab use for more demanding users.
Get the cell output to use in a variable¶
IPython’s output caching system defines several global variables:
[_] (a single underscore): stores previous output, like Python’s default interpreter.
[__] (two underscores): next previous.
[___] (three underscores): next-next previous.
Additionally, after each output x is created, there is a variable
_<x> created with the output as its value.
x= [i for i in range(7)]
[0, 1, 2, 3, 4, 5, 6]
y=_3 #the output of cell 2 , you could use also y=__
[0, 1, 2, 3, 4, 5, 6, 12]
[0, 1, 2, 3, 4, 5, 6, 12, 12]
You can place the ? character before or after (no space allowed) the object you are looking for docs.
Docstring: print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False) Prints the values to a stream, or to sys.stdout by default. Optional keyword arguments: file: a file-like object (stream); defaults to the current sys.stdout. sep: string inserted between values, default a space. end: string appended after the last value, default a newline. flush: whether to forcibly flush the stream. Type: builtin_function_or_method
Display source code¶
To access the source code simply use ?? instead.
Example to get the source code of the pprint command:
source: @line_magic def pprint(self, parameter_s=''): """Toggle pretty printing on/off.""" ptformatter = self.shell.display_formatter.formatters['text/plain'] ptformatter.pprint = bool(1 - ptformatter.pprint) print('Pretty printing has been turned', ['OFF','ON'][ptformatter.pprint])