a = 10

print(a)

"""
Explanation: Running Code
First and foremost, the IPython Notebook is an interactive environment for writing and running code. IPython is capable of running code in a wide range of languages. However, this notebook, and the default kernel in IPython 2.0, runs Python code.
Code cells allow you to enter and run Python code
Run a code cell using Shift-Enter or pressing the <button class='btn btn-default btn-xs'><i class="icon-play fa fa-play"></i></button> button in the toolbar above:
End of explanation
"""


import time
time.sleep(10)

"""
Explanation: There are two other keyboard shortcuts for running code:

Alt-Enter runs the current cell and inserts a new one below.
Ctrl-Enter run the current cell and enters command mode.

Managing the IPython Kernel
Code is run in a separate process called the IPython Kernel.  The Kernel can be interrupted or restarted.  Try running the following cell and then hit the <button class='btn btn-default btn-xs'><i class='icon-stop fa fa-stop'></i></button> button in the toolbar above.
End of explanation
"""


import sys
from ctypes import CDLL
# This will crash a Linux or Mac system
# equivalent calls can be made on Windows
dll = 'dylib' if sys.platform == 'darwin' else 'so.6'
libc = CDLL("libc.%s" % dll) 
libc.time(-1)  # BOOM!!

"""
Explanation: If the Kernel dies you will be prompted to restart it. Here we call the low-level system libc.time routine with the wrong argument via
ctypes to segfault the Python interpreter:
End of explanation
"""


print("hi, stdout")

from __future__ import print_function
print('hi, stderr', file=sys.stderr)

"""
Explanation: Cell menu
The "Cell" menu has a number of menu items for running code in different ways. These includes:

Run and Select Below
Run and Insert Below
Run All
Run All Above
Run All Below

Restarting the kernels
The kernel maintains the state of a notebook's computations. You can reset this state by restarting the kernel. This is done by clicking on the <button class='btn btn-default btn-xs'><i class='fa fa-repeat icon-repeat'></i></button> in the toolbar above.
sys.stdout and sys.stderr
The stdout and stderr streams are displayed as text in the output area.
End of explanation
"""


import time, sys
for i in range(8):
    print(i)
    time.sleep(0.5)

"""
Explanation: Output is asynchronous
All output is displayed asynchronously as it is generated in the Kernel. If you execute the next cell, you will see the output one piece at a time, not all at the end.
End of explanation
"""


for i in range(50):
    print(i)

"""
Explanation: Large outputs
To better handle large outputs, the output area can be collapsed. Run the following cell and then single- or double- click on the active area to the left of the output:
End of explanation
"""


for i in range(500):
    print(2**i - 1)

"""
Explanation: Beyond a certain point, output will scroll automatically:
End of explanation
"""


