How to match values in a column?

Question

I have a file temperature.txt with columns:

city 
avghigh 
avglow 
coldmonth 
coldavghigh
coldavglow
warmmonth 
warmavghigh
warmavglow 

I need to return the names of the cities which have the same average low temperature. I also have this function:

def run_query(db, q, args=None):
    conn = sqlite3.connect(db)
    cur = conn.cursor()
    if args is None:
        cur.execute(q)
    else:
        cur.execute(q, args)
    results = cur.fetchall()
    cur.close()
    conn.commit()
    conn.close()
    return results

all I got thus far (If it's correct is)

return run_query(noname.db, ('Select Cities, AvgLow from Table')

Answer 1

In SQL, this can be easily done using a self join on the table to get matching AvgLow for different cities like this:

Select 
t.Cities, 
t.AvgLow         
from Table1 t
INNER JOIN Table1 t1 ON t.AvgLow = t1.AvgLow 
                    and t.Cities <> t1.Cities
ORDER BY t.AvgLow;

SQLite Demo