Postgres/psycopg2 - Inserting array of strings

Question

I'm using Postgres 9 and Python 2.7.2 along with psycopg2 and am trying to insert an array of string values with properly escaped quotation marks. Sample:

metadata = {"Name": "Guest", "Details": "['One', 'Two', 'Three']"}

cur.execute("insert into meta values ('%s');" % metadata)

which throws the exception:

psycopg2.ProgrammingError: syntax error at or near "One"
LINE 1: "Details": "['One...
                      ^

I've also tried using Postgres' E to escape along with backslashes, but haven't found the correct combination yet. Ideas?

Answer 1

You have to let psycopg do parameters binding for you: don't try to quote them yourself.

Psycopg automatically converts a python list of strings into a postgres array. Check https://www.psycopg.org/docs/usage.html#lists-adaptation