Combine elements of a list of lists into a string-CodePudding

I have to combine these 2 lists:

dots = [['.', '.', '.', '.', '.', '.', '.', '.', '.'],
 ['.', '.', '.', '.', '.', '.', '.', '.', '.'],
 ['.', '.', '.', '.', '.', '.', '.', '.', '.'],
 ['.', '.', '.', '.', '.', '.', '.', '.', '.'],
 ['.', '.', '.', '.', '.', '.', '.', '.', '.'],
 ['.', '.', '.', '.', '.', '.', '.', '.', '.'],
 ['.', '.', '.', '.', '.', '.', '.', '.', '.'],
 ['.', '.', '.', '.', '.', '.', '.', '.', '.'],
 ['.', '.', '.', '.', '.', '.', '.', '.', '.']]
spaces = [['   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ', '   '],
 ['   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ', '   '],
 ['   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ', '   '],
 ['   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ', '   '],
 ['   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ', '   '],
 ['   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ', '   '],
 ['   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ', '   '],
 ['   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ', '   '],
 ['   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ', '   ']]

I want every dot separeted by a space and turn them into string just like this:

.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .

I wrote this code but it only work for the first line:

lists = [a for b in zip(dots[0], spaces[0]) for a in b]
line = ''.join(liste)

I wanted to know how to loop in for every other sublist in these two lists.

CodePudding user response：

You know how to use zip to simultaneously iterate over two lists, so do that and create a list of strings containing a dot and space for each "row":

lines = [
          "".join(
              dot   space 
              for dot, space in zip(row_dots, row_spaces)
          )
          for row_dots, row_spaces in zip(dots, spaces) 
       ]

Then join the individual lines using the newline character '\n'.

output = "\n".join(lines)
print(output)

.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .
.   .   .   .   .   .   .   .   .

Of course, you can combine both into a single statement so that you don't need to create the list of lines:

output = "\n".join(
              "".join(
                  dot   space 
                  for dot, space in zip(row_dots, row_spaces)
              )
              for row_dots, row_spaces in zip(dots, spaces) 
         )

CodePudding user response：

You solved your problem for list, last thing you need is to iterate over every list in dots and spaces

result = []
for i in range(len(dots)):
    lists = [a for b in zip(dots[i], spaces[i]) for a in b]
    line = ''.join(lists)
    result.append(line)

Or just put it into your list comprehesion:

lists = [a for i in range(len(dots)) for b in zip(dots[i], spaces[i]) for a in b]
line = "".join(lists)