In [1]:

    

# you can also access this directly:
from PIL import Image
im = Image.open("DataScienceProcess.jpg")
im
#path=\'DataScienceProcess.jpg'
#image=Image.open(path)


    

    
Out[1]:

In [2]:

    

# Comments
# ls list of the files in this folder. See below.
This line will make an error because this line is not python code and this is a code cell.
# Leveraging
#http://localhost:8888/notebooks/Dropbox/Python/Harvard%20SEAS%20Tutorial/python-mastery-isr19-master/1-PythonReview.ipynb


    

    




  File "<ipython-input-2-110c11bd529c>", line 3
    This line will make an error because this line is not python code and this is a code cell.
            ^
SyntaxError: invalid syntax

In [3]:

    

ls # NOT PYTHON! command line


    

    




DataScienceProcess.jpg  HourofCode2015-Copy1.ipynb  Hour of Code 2015.pdf
Data_Science_VD.png     HourofCode2015.ipynb

In [4]:

    

pwd # ALSO NOT PYTHON! Shows what folder you are in.


    

    
Out[4]:





u'/home/perry/Dropbox/Python/Hour of Code 2015'

In [5]:

    

# math
1+2


    

    
Out[5]:





3

In [6]:

    

4000*3


    

    
Out[6]:





12000

In [18]:

    

import math
math.sqrt(2)


    

    
Out[18]:





1.4142135623730951

In [10]:

    

2 ** (0.5)


    

    
Out[10]:





1.4142135623730951

In [11]:

    

637*532.6


    

    
Out[11]:





339266.2

In [14]:

    

from __future__ import division
1/2


    

    
Out[14]:





0.5

In [17]:

    

(8+5)*4


    

    
Out[17]:





52

In [ ]:

    




    

In [19]:

    

# Create a variable
name = 'Perry Grossman'


    

In [20]:

    

# Print the variable
name


    

    
Out[20]:





'Perry Grossman'

In [23]:

    

name[6]


    

    
Out[23]:





'G'

In [25]:

    

from functools import partial
# https://docs.python.org/2/library/functools.html
from random import choice, randint


    

In [38]:

    

choice('yes no maybe'.split()) # split is a method


    

    
Out[38]:





'maybe'

In [42]:

    

for i in range(10):
    print("Call me " + choice('yes no maybe'.split()))


    

    




Call me yes
Call me maybe
Call me yes
Call me maybe
Call me maybe
Call me yes
Call me maybe
Call me maybe
Call me no
Call me maybe

In [46]:

    

randint(1, 6)


    

    
Out[46]:





3

In [49]:

    

# If you need dice, try this:

roll = partial(randint, 1, 20)


    

In [55]:

    

roll()
# how would you make 20 sided dice?


    

    
Out[55]:





6

In [56]:

    

# Create a list of numbers
vals = [3, -8, 2, 7, 6, 2, 5, 12, 4, 9]


    

In [57]:

    

#Find the even numbers
evens = []
for v in vals:
    if v%2 == 0:
        evens.append(v)
#How is this working?


    

In [58]:

    

evens


    

    
Out[58]:





[-8, 2, 6, 2, 12, 4]

In [60]:

    

squares = []
for v in vals:
    squares.append(v*v)


    

In [61]:

    

squares


    

    
Out[61]:





[9, 64, 4, 49, 36, 4, 25, 144, 16, 81]

In [62]:

    

bigsquares = []
for v in vals:
    s = v*v
    if s > 10:
        bigsquares.append(s)


    

In [63]:

    

bigsquares


    

    
Out[63]:





[64, 49, 36, 25, 144, 16, 81]