starter-code-1.ipynb

Kernel: Python 2

Check to see if you're ready to go on Thursday!

1. Run each block of code

2. Check for errors

3. When you think you're error free, flag down a teaching team member to confirm

####This is what an error looks like
print a

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-1-45f0826d477c> in <module>()
      1 ####This is what an error looks like
----> 2 print a

NameError: name 'a' is not defined

Objectives

Get comfortable with IPython Notebook

• How to start IPython Notebook

• How to read data into pandas

• How to do simple manipulations on pandas dataframes

Start a notebook:

For each class, we'll be using a set of common data science libraries and tools, like the IPython notebook. You can start an IPython notebook by running

jupyter notebook $NAME_OF_FILE

Try it yourself!

Read and run the block of code below by:

1. Clicking on it and pressing the play button above or

2. Using a short cut- (help --> keyboard shortcuts)

%matplotlib inline
import matplotlib.pyplot as plt
import matplotlib as mpl
import pandas as pd

mpl.rcParams['figure.figsize'] = (15, 6)
pd.set_option('display.width', 4000)
pd.set_option('display.max_columns', 100)

First: Read in the data

Review Simple Commands

Practice downloading and reading into sample data

# Download and read the data (this may take more than 1 minute)
orig_data = pd.read_csv('../../assets/dataset/311-service-requests.csv', parse_dates=['Created Date'], low_memory=False)

plt.scatter(orig_data['Longitude'], orig_data['Latitude'], marker='.', color="purple")

Try this Example:

Graph the number of noise complaints each hour in New York

complaints = orig_data[['Created Date', 'Complaint Type']]
noise_complaints = complaints[complaints['Complaint Type'] == 'Noise - Street/Sidewalk']
noise_complaints.set_index('Created Date').sort_index().resample('H', how=len).plot()

Second: Using IPython

Review Python Basics

Test your skills by answering the following questions:

Question 1. Divide 10 by 20 and set the result to a variable named "A"

### Insert your code here and then uncomment | print A | when you are ready to test it. 

#print(A)

#### If you did not get a float (decimals), alter your equation to get the desired result (0.5) 

Question 2. Create a function called division that will divide any two numbers and prints the result (with decimals).

Call your function. Confirm that the results are as expected.

# add your function here

Question 3. Using .split() split my string into separate words in a variable named words

my_string = "the cow jumped over the moon"
# put your code here it should return ['the', 'cow', 'jumped', 'over', 'the', 'moon']

# print(words)

Question 4. How many words are in my_string?

Question 5. Use a list comprehension to find the length of each word

result: [3, 3, 6, 4, 3, 4]

Question 6. Put the words back together in a variable called sentence using .join()

result: the cow jumped over the moon

Bonus: Add a "||" between each word

result: the||cow||jumped||over||the||moon