Concatenating sublists with ":"

Question

I'm trying to build a string using ":" and then write that string to a file. Function gets two lists that include strings, which are amounts of money

[["$123,123,123", "$68,656", "$993,993,993,993", "$123,141,142,142"],
 ["$60", "$800,600", "$700,600,500", "$20,200,200,201"]]

It should be written as

"$123,123,123":"$68,656":"$993,993,993,993":"$123,141,142,142"
"$60":"$800,600":"$700,600,500":"$20,200,200,201"

Currently I have something like this:

def save_amount (amount, moneys):
    with open (moneys, "w") as file:
        for i in amount:
            moneys_s = str(i)

How to proceed?

You need to flatten the list of lists and then join on ":" rather than splitting — karthikr, Jul 28 '17 at 11:01
Question title says, split with ":" but your question body says the opposite. — Lafexlos, Jul 28 '17 at 11:01
Is this not a case for the [csv](https://docs.python.org/2.7/library/csv.html) module? It looks like a dialect with delimiter=':' and quoting=QUOTE_ALL. — Yann Vernier, Jul 28 '17 at 11:17

akash karothiya · Answer 1 · 2017-07-28T11:13:09.347

2

First flatten the list and then use join, Use list comprehension here :

>>> [ ':'.join('"' + j + '"' for j in i) for i in l ]
['"$123,123,123":"$68,656":"$993,993,993,993":"$123,141,142,142"',
'"$60":"$800,600":"$700,600,500":"$20,200,200,201"']

edited Jul 28 '17 at 11:13

answered Jul 28 '17 at 11:03

akash karothiya

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This does not fit the description, the `"` around each sublist are missing. – Christian König Jul 28 '17 at 11:05
For more details on flatting lists see: https://stackoverflow.com/questions/952914/making-a-flat-list-out-of-list-of-lists-in-python – albert Jul 28 '17 at 11:05
3

The `Good artists copy, Great artists steal` in your dev story works great with your profile picture! – moritzg Jul 28 '17 at 11:06
user needs output in multi-line – Gahan Jul 28 '17 at 11:10
@moritzg nice observation, I admire Martijn Pieters, he is inspiration – akash karothiya Jul 28 '17 at 11:18

score 1 · Answer 2 · answered Jul 28 '17 at 11:08

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'"' + '":"'.join( str(j) for i in money for j in i) + '"'

where money is your list of lists

answered Jul 28 '17 at 11:08

skend

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user needs output in multi-line – Gahan Jul 28 '17 at 11:10

score 1 · Answer 3 · answered Jul 28 '17 at 11:10

l = [["$123,123,123", "$68,656", "$993,993,993,993", "$123,141,142,142"],
     ["$60", "$800,600", "$700,600,500", "$20,200,200,201"]]
[ ':'.join('"' + j + '"' for j in i) for i in l ]

Output:

['"$123,123,123":"$68,656":"$993,993,993,993":"$123,141,142,142"',
 '"$60":"$800,600":"$700,600,500":"$20,200,200,201"']

Concatenating sublists with ":"

3 Answers3