Zip lists in Python
list, python, python-2.7, python-zip
Solution
When you `zip()` together three lists containing 20 elements each, the result has twenty elements. Each element is a three-tuple.
See for yourself:
In [1]: a = b = c = range(20)
In [2]: zip(a, b, c)
Out[2]:
[(0, 0, 0),
(1, 1, 1),
...
(17, 17, 17),
(18, 18, 18),
(19, 19, 19)]
To find out how many elements each tuple contains, you could examine the length of the first element:
In [3]: result = zip(a, b, c)
In [4]: len(result[0])
Out[4]: 3
Of course, this won't work if the lists were empty to start with.
Problem
I am trying to learn how to "zip" lists. To this end, I have a program, where at a particular point, I do the following: ``` x1, x2, x3 = stuff.calculations(withdataa) ``` This gives me three lists, `x1`, `x2`, and `x3`, each of, say, size 20. Now, I do: ``` zipall = zip(x1, x2, x3) ``` However, when I do: ``` print "len of zipall %s" % len(zipall) ``` I get 20, which is not what I expected. I expected three. I think I am doing something fundamentally wrong.