Python: Convert tuple to comma separated String

Question

import MySQLdb

db = MySQLdb.connect(\"localhost\",\"root\",\"password\",\"database\")
cursor = db.cursor()
cursor.execute(\"SELECT id FROM some_table\")
u_data = cu         


        

Answer 1

Use itertools.chain_fromiterable() to flatten your nested tuples first, then map() to string and join(). Note that str() removes the L suffix because the data is no longer of type long.

>>> from itertools import chain
>>> s = ((1320088L,),)
>>> ','.join(map(str,chain.from_iterable(s)))
'1320088'

>>> s = ((1320088L,1232121L),(1320088L,),)
>>> ','.join(map(str,chain.from_iterable(s)))
'1320088,1232121,1320088'

Note, string is not a good variable name because it is the same as the string module.