IPython is a neat alternative of Python's builtin REPL (Read–Eval–Print Loop) interpreter, also a kernel of Jupyter.
ref:
https://ipython.org/
https://jupyter.org/
Useful Commands
# cheatsheet
%quickref
# show details of any objects (including modules, classes, functions and variables)
random?
os.path.join?
some_variable?
# show source code of any objects
os.path.join??
# show nothing for a function that is not implemented in Python
len??
# run some shell commands directly in IPython
pwd
ll
cd
cp
rm
mv
mkdir new_folder
# run any shell command with ! prefix
!ls
!ping www.google.com
!youtube-dl
# assign command output to a variable
contents = !ls
print(contents)ref:
http://ipython.readthedocs.io/en/stable/interactive/tutorial.html
Magic Functions
# list all magic functions
%lsmagic
# run a Python script and load objects into current session
%run my_script.py
# run a profiling for multi-line code
%%timeit
array = []
for i in xrange(100):
array.append(i)
# paste multi-line code
# you might not need them in IPython 5.0+, just paste your code
%cpaste
# explore objects
%pdoc some_object
%pdef some_object
%psource some_object
%pfile some_object
# if you call it after hitting an exception, it will automatically open ipdb at the point of the exception
%debug
# the In object is a list which keeps track of the commands in order
print(In)
# the Out object is a dictionary mapping input numbers to their outputs
pinrt(Out)
print(Out[2], _2)ref:
https://ipython.readthedocs.io/en/stable/interactive/magics.html
https://www.safaribooksonline.com/library/view/python-data-science/9781491912126/ch02.html
Issues
Reload Any Python Module
from your.project import your_module
your_module.run_shit(123)
# after you made some changes on your_module
from importlib import reload
reload(your_module)
your_module.run_shit(123)ref:
https://stackoverflow.com/questions/5364050/reloading-submodules-in-ipython