如何将元组列表转换为元组

Question

I have list like:

L = [('a',1),('b',2),....]

I want to pass this tuples to the query for bulk insertion.

sql = "INSERT INTO [plma].["+tablename+"] VALUES {}".format(L)

but this qry takes L as [(),()] , where to execute this qry properly it needs to be only (),()

so I want only tuples from that list L, How to pass them ?

Answer 1

串化和剥离：

sql = "INSERT INTO [plma].["+tablename+"] VALUES " + str(L).strip('[]')

Answer 2

To join the elements of a list to a string, I would use .join() and list comprehension, as I find it rather nice and pythonic:

values = ', '.join(str(e) for e in L)
sql = "INSERT INTO [plma].[{}] VALUES {}".format(tablename, values)

However, as has been pointed out, there may be better ways to approach the actual issue of inserting into a database.