Added files for Ecoanova's Python 3 course.

Ecoanova/Introduccion a Python 3/Ejemplos/db.py

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+import sqlite3
+
+# "Connect" to a database
+conn = sqlite3.connect('example.db')
+
+# Get a cursor to operate on the database
+c = conn.cursor()
+
+# Create table
+c.execute('''CREATE TABLE stocks
+             (date text, trans text, symbol text, qty real, price real)''')
+
+# Insert a row of data
+c.execute("INSERT INTO stocks VALUES ('2006-01-05','BUY','RHAT',100,35.14)")
+
+# Save (commit) the changes
+conn.commit()
+
+# Select
+t = ('RHAT',)
+c.execute('SELECT * FROM stocks WHERE symbol=?', t)
+print(c.fetchone())
+
+# Larger example that inserts many records at a time
+purchases = [('2006-03-28', 'BUY', 'IBM', 1000, 45.00),
+             ('2006-04-05', 'BUY', 'MSFT', 1000, 72.00),
+             ('2006-04-06', 'SELL', 'IBM', 500, 53.00),
+            ]
+c.executemany('INSERT INTO stocks VALUES (?,?,?,?,?)', purchases)
+
+for row in c.execute('SELECT * FROM stocks ORDER BY price'):
+    print(row)
+
+# We can also close the connection if we are done with it.
+# Just be sure any changes have been committed or they will be lost.
+conn.close()