Generating new List Pair from List Elements

Question

and list of keys. I want to create a new pair list with increasing the number of elements in new pair list each time. I write a short python code for this, but its not doing what I expected, I can't find where I am doing Wrong.

    keys = ['83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c', 'cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cbbcfce733b1ae42c044131aab3e9439']
    k = 'cbbcfce733b1ae42c044131aab3e9439'
    freq = []
    pair = [k]

    for key in keys:
        pair.append(key)
        freq.append(pair)

    print(freq)

Expected Result:

[['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3'],
['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c'],
['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c', 'cbbcfce733b1ae42c044131aab3e9439'],
['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c', 'cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3'],
['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c', 'cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cbbcfce733b1ae42c044131aab3e9439']]

But I got following result:

[['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c', 'cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cbbcfce733b1ae42c044131aab3e9439'], ['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c', 'cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cbbcfce733b1ae42c044131aab3e9439'], ['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c', 'cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cbbcfce733b1ae42c044131aab3e9439'], ['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c', 'cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cbbcfce733b1ae42c044131aab3e9439'], ['cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cc657723152be15805bb53894486653c', 'cbbcfce733b1ae42c044131aab3e9439', '83eb48aa3c770a55eb194b3e8c8207e3', 'cbbcfce733b1ae42c044131aab3e9439']]

I spent more than hour but couldn't find where i am doing wrong.

Isn’t posible to make a readable example? – Mykola Zotko Mar 16 '19 at 13:20 — Mykola Zotko, Mar 16 '19 at 13:20

score 0 · Answer 1 · answered Mar 16 '19 at 13:14

Need to use .copy() function to create copy of the pair list element, seems python links to list variable when append to another list. to copy the current list, need to use .copy() like:

for key in keys:
        pair.append(key)
        freq.append(pair.copy())

Generating new List Pair from List Elements

1 Answers1