After Connecting, you can execute a SQL statement and retrieve the results.

SELECT Procedure

You will need to obtain a cursor before executing any SQL. Once you have one, you can use the cursor's execute method.

cursor = cnxn.cursor()
cursor.execute("SELECT Type, DatasetName FROM Schemas WHERE ProjectId = 'bigquery-public-data'")

Iterating over the Results

You can use a for loop to iterate over the rows of the resultset. Each row is presented as a tuple containing column values:

for (Type, DatasetName) in cursor:
    print("Type = {}, DatasetName = {}".format(Type, DatasetName))