ipython examples

sql example

# coding: utf-8

# # this is an ipython notebook
# 
# This is a markdown block that I can use to describe whatever I want to talk about.

# In[1]:

POSTGRES_URI = "postgresql+psycopg2://localhost:5432/steder"


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from sqlalchemy import create_engine
engine = create_engine(POSTGRES_URI)


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print engine


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engine.execute("DROP TABLE IF EXISTS users;")
engine.execute("CREATE TABLE users (id SERIAL);")


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[x for x in engine.execute("SELECT * FROM users")]


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from matplotlib import pyplot


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pyplot.plot([1, 2, 3])


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# show this inline rather than popping up a new window:
get_ipython().magic(u'matplotlib inline')


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pyplot.plot([1,2,3,4,5,6])


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x = [1, 2, 3, 4]
y = [i ** 2 for i in x]
pyplot.plot(x, y)


# In[11]:

print "Hello World"


# In[12]:

def f(x):
    return x ** 2
x = xrange(1, 1000)
y = map(f, x)
pyplot.plot(x, y)


# # ipython-sql
# 
# Let's try using an extension to make working with SQL more intuitive
# 

# In[13]:

get_ipython().magic(u'load_ext sql')


# In[14]:

get_ipython().magic(u'sql postgresql+psycopg2://localhost:5432/steder')


# In[15]:

get_ipython().magic(u'config SqlMagic.feedback=True')
get_ipython().magic(u'config SqlMagic.autolimit=0')
get_ipython().magic(u'config SqlMagic.autopandas=True')
get_ipython().magic(u'config SqlMagic.displaylimit=10')


# In[16]:

get_ipython().run_cell_magic(u'sql', u'', u"DROP TABLE IF EXISTS users;\nCREATE TABLE users (id SERIAL, username VARCHAR(16), email VARCHAR(256), birthdate TIMESTAMP WITH TIME ZONE DEFAULT NOW());\nINSERT INTO users (username, email) VALUES ('mike', 'mike@example.com');\nINSERT INTO users (username, email) VALUES ('carolyn', 'carolyn@example.com');\nSELECT * FROM users;")


# In[22]:

x = _


# In[23]:

print x


# In[24]:

x.plot()


# In[30]:

x = get_ipython().magic(u'sql select id, birthdate from users;')


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x.plot()


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print x


# In[34]:

x.stack()


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