cursor.execute("INSERT INTO im_entry.test ("+entrym+") VALUES ('"+p+"');")

   entrym='entry开发者_如何学C'
   entrym=entrym+ str(idx)

   cursor.execute("INSERT INTO im_entry.test ("+entrym+") VALUES ('"+p+"');")

I am using a query like this, where entry1, entry2 etc. are my database tables. The program doesn't show any errors, but the p value does not get inserted in the db. What is wrong here? Please help me.

By default, psycopg2 starts transactions for you automatically, which means that you have to tell it to commit. Note that commit is a method of the connection, not the cursor.

conn = psycopg2.connection('...')
cur = conn.cursor()
cur.execute("...")
conn.commit()

The intent is that you can group multiple statements together in a single transaction, so other queries won't see half-made changes, but also for performance reasons.

Also note that you should always use placeholders, instead of concatenating strings together.
E.g.:

cur.execute("INSERT INTO im_entry.test (colname) VALUES (%s)", [p])

Otherwise you risk making SQL injection attacks possible.