SQLite query through Python returns strange variable name

edit

I'm using the following Python code to query a SQLite output file produced by EnergyPlus:

import sqlite3
import os

sqlite_file = './test_sql_h.sql'

table_name = 'ReportDataDictionary'
id_column = 'ReportDataDictionaryIndex'
column_a = 'Name'
column_b = 'KeyValue'

# connect to the database file
conn = sqlite3.connect(sqlite_file)
c = conn.cursor()

# identify all unique variable names
c.execute(
        ' SELECT DISTINCT ({col}) FROM {tn} '.\
        format(tn=table_name, col=column_a)
        )
all_names_unique = c.fetchall()
for i in range(0, len(all_names_unique)):
    print(all_names_unique[i])

# commit changes and queries, and close the connection
conn.commit()
conn.close()

However, each variable name is enclosed in a pair of single quotation marks proceeded by the letter "u" as shown below.

(u'Zone Lights Electric Energy',)
(u'Zone Electric Equipment Electric Energy',)
(u'Zone Ideal Loads Supply Air Total Heating Energy',)
(u'Zone Ideal Loads Supply Air Total Cooling Energy',)

May I ask why the output is not the pure name of the variable?

Thanks.