Python Insert list items in a for loop structure

Question

New to Python. I need to insert an item for a list in a for loop structure this way:

Item-1: List-Item-1
Item-2: List-Item-2
Item-n: List-Item-n

Here is my code:

mylist = ["uno", "dos", "tres", "cuatro"]

length = len(mylist)
print length
length += 1
print length

for i in range(1, length):
    print " item %d:" % i

I just can figure it out. I'm able to print the list item or the item number separated but I can't get them together

Any Help would be much appreciated

willeM_ Van Onsem · Accepted Answer · 2017-02-14 17:33:08Z

1

You can use enumerate(..) for that:

for i,item in enumerate(mylist,1):
    print " item-%d: %s" %(i,item)

or even shorter:

for tup in enumerate(mylist,1):
    print " item-%d: %s" %tup

The 1 in enumerate(..) means you start counting at 1. enumerate(..) will produce a enumerable of tuples containing the index (here i) and the element (here item). In the for loop we use sequence unpacking to unpack them and print the properly:

$ python2
Python 2.7.12 (default, Nov 19 2016, 06:48:10) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> mylist = ["uno", "dos", "tres", "cuatro"]
>>> for i,item in enumerate(mylist,1):
...     print " item-%d: %s" %(i,item)
... 
 item-1: uno
 item-2: dos
 item-3: tres
 item-4: cuatro

answered Feb 14, 2017 at 17:33

willeM_ Van Onsem

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