import sys
import io

io?

io??

# IPython Quick Refence
%quickref

# Python Refence
help()

%pdoc io.FileIO

%pdef io.OpenWrapper

%psource io

%pfile io

# Browse an object with tab
sys

# Shift-tab to get more information about a method
open()

# Listing all magic
%lsmagic

# Measuring Performance
%timeit range(1000)
%timeit xrange(1000)

%%timeit
# Measuring Block Performance

for x in range(1000):
    y=x+1

%%timeit
# Measuring Block Performance

for x in xrange(1000):
    y=x+1

# Reset (Delete) all variables
%reset

%%bash
echo $PATH

3+5

In[18]

Out[18]

_ + 3

_ - 4