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, x...

I'm extremely new to Python so this just recently tripped me up, but it had to do more with how the example was presented and what was emphasized. What gave me problems with …

Q1- I do not understand "for x, y in zip (Class_numbers, students_per_class)". Is it like a 2d for loop? why we need the zip? Can we have 2d loop with out zip function? Q2-I am not …

119 Unlike in Python 2, the zip function in Python 3 returns an iterator. Iterators can only be exhausted (by something like making a list out of them) once. The purpose of this is to save …

I'm following a tutorial on neural nets1 It's in Python 2.7. I'm using 3.4. This is the line that troubles me: if test_data: n_test = len (test_data) I get: TypeError: object of type 'zip' has no le...

zipfile.zip\ dirA.zip\ a dirB.zip\ b dirC.zip\ c I want to extract all the inner zip files that are inside the zip file in directories with these names (dirA, dirB, dirC). Basically, I want to end up with the …

The python docs gives this code as the reverse operation of zip: >>> x2, y2 = zip (*zipped) In particular zip () in conjunction with the * operator can be used to unzip a list.

10 iter(s) returns an iterator for s. [iter(s)]*n makes a list of n times the same iterator for s. So, when doing zip(*[iter(s)]*n), it extracts an item from all the three iterators from the list in order. …

16 I love the elegance of the zip function, but using the itemgetter () function in the operator module appears to be much faster. I wrote a simple script to test this:

In Python 3, zip now returns a lazy iterator, and this is now the most performant approach. dict(zip(keys, values)) does require the one-time global lookup each for dict and zip, but it …