Question

map(tuple, map(lambda row: [float(row[0]), int(row[1]), parse(row[2])], res))

Can someone help me with the syntax here? I’m trying to understand specifically what tuple and lambda is referring to.

Answer 1

If it’s easier to follow you could rewrite this a few times, from

map(tuple, map(lambda row:
    [float(row[0]), int(row[1]), parse(row[2])], res))

to

map(lambda row: (float(row[0]), int(row[1]), parse(row[2])), res)

to

[(float(row[0]), int(row[1]), parse(row[2])) for row in res]

That doesn’t really answer your question, but I thought it was easier to read 😉