CODEWITHSUNDEEP
python
OlaF
OlaF

Reputation: 19

Joining int in python as a list

My input is looking like this right now:

[6, 7, 5, 2, 9, 9], [7, 1, 5, 6, 7], [1, 2, 0, 6, 3, 3, 8], [8, 0, 5, 1, 2, 3]

I want to make a list looking like this:

[675299, 71567, 1206338, 805123]

How can I do that?

Upvotes: 1

Views: 200

Answers (5)

sheh
sheh

Reputation: 1023

This is variant without string conversions:

>>> [sum([10**k*j for k,j in enumerate(i)]) for i in l]
[675299, 71567, 1206338, 805123]

Upvotes: 1

nehem
nehem

Reputation: 13662

If you're drunk you'll find this as straightforward

>>> l = [6, 7, 5, 2, 9, 9], [7, 1, 5, 6, 7], [1, 2, 0, 6, 3, 3, 8], [8, 0, 5, 1, 2, 3]
>>> l = eval (str(l).replace(", ","").replace("][",","))
>>> l
[675299, 71567, 1206338, 805123]

Upvotes: 0

dot.Py
dot.Py

Reputation: 5157

The problem is that .join() method only works with strings... so when you try to use it with integers, it doesn't work!

You can achieve what you want using the following code:

lst = [[6, 7, 5, 2, 9, 9],[7, 1, 5, 6, 7],[1, 2, 0, 6, 3, 3, 8],[8, 0, 5, 1, 2, 3]]

new_lst = []

# i'm going to iter over the list to join the items inside of it
# then i'll create a new number by joining each item inside each input list 
# and then append it to a new list
for item in lst:
    new_number = ''.join(str(x) for x in item)
    new_number = int(new_number)
    new_lst.append(new_number)

print new_lst

Output: [675299, 71567, 1206338, 805123]

If you want to study this topic, search: join list integers python

Upvotes: 0

Rafał Łużyński
Rafał Łużyński

Reputation: 7322

arrays = [6, 7, 5, 2, 9, 9], [7, 1, 5, 6, 7], [1, 2, 0, 6, 3, 3, 8], [8, 0, 5, 1, 2, 3]
str_arrays = [[str(number) for number in array] for array in arrays]
[int(''.join(array)) for array in str_arrays]

Upvotes: 0

Andreas Grapentin
Andreas Grapentin

Reputation: 5796

transforming a list of digits to an integer is as simple as: 

l = [6, 7, 5, 2, 9, 9]
n = int(''.join(map(str, l)))

where n holds your result.

adapting this to a list of lists of digits is trivial:

l = [ 
    [6, 7, 5, 2, 9, 9],
    [7, 1, 5, 6, 7],
    [1, 2, 0, 6, 3, 3, 8],
    [8, 0, 5, 1, 2, 3]
]

n = [ int(''.join(map(str, t))) for t in l ]

again, n holds your result:

>>> print(n)
[675299, 71567, 1206338, 805123]

Upvotes: 4

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