How to join values of map in python

list, python, string

Solution

Firstly, iterate through the list and get only the second element (you can use list comprehension for shorthand). Then use `",".join(list)` to get the desired output, see http://docs.python.org/2/library/string.html#string.join:

>>> original = """0,15
... 1,14
... 2,0
... 3,1
... 4,12
... 5,6
... 6,4
... 7,2
... 8,8
... 9,13
... 10,3
... 11,7
... 12,9
... 13,10
... 14,11
... 15,5"""
>>> 
>>> print [i.split(",")[1] for i in original.split("\n")]
['15', '14', '0', '1', '12', '6', '4', '2', '8', '13', '3', '7', '9', '10', '11', '5']
>>> print ",".join([i.split(",")[1] for i in original.split("\n")])
15,14,0,1,12,6,4,2,8,13,3,7,9,10,11,5

or if you have them in tuples:

>>> original = """0,15
... 1,14
... 2,0
... 3,1
... 4,12
... 5,6
... 6,4
... 7,2
... 8,8
... 9,13
... 10,3
... 11,7
... 12,9
... 13,10
... 14,11
... 15,5"""
>>>
>>> original_tuples = [tuple(i.split(",")) for i in original.split("\n")]
>>> original_tuples
[('0', '15'), ('1', '14'), ('2', '0'), ('3', '1'), ('4', '12'), ('5', '6'), ('6', '4'), ('7', '2'), ('8', '8'), ('9', '13'), ('10', '3'), ('11', '7'), ('12', '9'), ('13', '10'), ('14', '11'), ('15', '5')]
>>> ",".join(map(str,[j for i,j in original_tuples]))
'15,14,0,1,12,6,4,2,8,13,3,7,9,10,11,5'

Alternatively, you can skip the `map(str,list)` and cast the elements into string within the list comprehension

>>> ",".join(str(j) for i,j in original_tuples)
'15,14,0,1,12,6,4,2,8,13,3,7,9,10,11,5'

Problem

I have a map like: ``` 0,15 1,14 2,0 3,1 4,12 5,6 6,4 7,2 8,8 9,13 10,3 11,7 12,9 13,10 14,11 15,5 ``` To print that I am doing ``` def PrintValuesArray(su_array): for each in su_array: print ",".join(map(str, each)) ``` However I only want the values and comma separated like: I have tried ``` def PrintSuffixArray(su_array): for key, value in su_array: print ",".join(map(str, value)) ``` but got print ",".join(map(str, value)) TypeError: argument 2 to map() must support iteration and also ``` def PrintSuffixArray(su_array): for key, value in su_array: print ",".join(map(str, value in su_array)) ``` print ",".join(map(str, value in su_array)) TypeError: argument 2 to map() must support iteration How to print result like ``` 15, 14, 0, 1, 12, 6, 4, 2, 8, 13, 3, 7, 9, 10, 11, 5 ```

Original source