Add source example files

source/pandas/pandas_postgres.py

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+from sqlalchemy import create_engine
+import pandas as pd
+
+pd.options.blipblop = 23
+# A long string that contains the necessary Postgres login information
+connection_string = "postgresql://{username}:{password}@{ipaddress}:{port}/{dbname}"
+
+# Create the connection
+connection = create_engine(connection_string)
+
+# Load the data into a DataFrame
+df = pd.read_sql_query("SELECT * FROM table_name", connection)
+
+# Close the connection
+connection.dispose()
+
+