Python

ipython notebook

jupyter notebook

Shift-Enter, implement the current cell and move to the next cell

Ctrl-Enter, implment the current cell and stay in the current cell

Alt-Enter, implement the current cell and insert a new cell below

from IPython.display import display
from IPython.display import Image

i = Image(filename='Python.jpeg'); # create an image from a filename
i2 = Image(url='http://www.ecsu.edu/_resources/images/logos/ecsulogo_original_450px.png'); # create an image from an url
display(i)
display(i2)

from IPython.display import YouTubeVideo
YouTubeVideo('_GtFn3h6uDM')

from IPython.core.display import HTML
HTML('http://www.google.com')

from IPython.display import Math
Math(r'F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx')

from IPython.display import Latex
Latex(r"""\begin{align} e^{i\pi} + 1 = 0 \end{align}""")

%%latex
\begin{align} e^{i\pi} + 1 = 0 \end{align}

Inline expressions, $e^{i\pi} + 1 = 0$

Expressions on their own line, $$e^x=\sum_{i=0}^\infty \frac{1}{i!}x^i$$

```python
import scipy
```

object?, print all sorts of details about any object

%alias, define an alias for a system command

%env, get the environment variables

%history, print input history

%load, load code into the current frontend

%lsmagic, list currently available magic functions

%pylab, load numpy and matplotlib to work interactively

%quickref, get the ipython reference

%run hello.py, run a python script

%timeit, measure the running time

%who, print all interactive variables

%%bash, run cells with bash in a subprocess

%%html, render the cell as a block of HTML

%%javascript, run the cell block of Javascript code

%%js, run the cell block of Javascript code

%%latex, render the cell as a block of latex

%%markdown, render the cell as Markdown text block

%%python2, %%python2 script magic

%%python3, %%python3 script magic

%%sh, %%sh script magic

%%writefile, Write the contents of the cell to a file

!, run command

!ping www.google.com, ping a ip address

d = !ls, save the outputs of the command to a variable

Input caching system

In, a list of all inputs
_i, _ii, _iii, store previous, next previous and next-next previous inputs

Output caching system

[_], [__], [___], stores previous, next previous and next-next previous outputs

Click "Save" button to create a checkpoint

File -> Revert to Checkpoint

%autosave 1000 # automatically save every 1000 seconds