Convert tuple to list and back

Question

I m currently working on a map editor for a game in pygame  using tile maps  The level is built up out of blocks in the following structure  though much larger    level1               1 1 1 1 1 1            1 0 0 0 0 1            1 0 0 0 0 1            1 0 0 0 0 1            1 0 0 0 0 1            1 1 1 1 1 1     where  1  is a block that s a wall and  0  is a block that s empty air   The following code is basically the one handling the change of block type   clicked   pygame mouse get pressed   if clicked 0     1      currLevel   mousey cameraY  60     mousex cameraX  60     1   But since the level is stored in a tuple  I m unable to change the values of the different blocks  How do I go about changing the different values in the level in an easy manner

User · Answer

You could dramatically speed up your stuff if you used just one list instead of a list of lists. This is possible of course only if all your inner lists are of the same size (which is true in your example, so I just assume this).

WIDTH = 6
level1 = [ 1,1,1,1,1,1,
           1,0,0,0,0,1,
           1,0,0,0,0,1,
           1,0,0,0,0,1,
           1,0,0,0,0,1,
           1,1,1,1,1,1 ]
print level1[x + y*WIDTH]  # print value at (x,y)

And you could be even faster if you used a bitfield instead of a list:

WIDTH = 8  # better align your width to bytes, eases things later
level1 = 0xFC84848484FC  # bit field representation of the level
print "1" if level1 & mask(x, y) else "0"  # print bit at (x, y)
level1 |= mask(x, y)  # set bit at (x, y)
level1 &= ~mask(x, y)  # clear bit at (x, y)

with

def mask(x, y):
  return 1 << (WIDTH-x + y*WIDTH)

But that's working only if your fields just contain 0 or 1 of course. If you need more values, you'd have to combine several bits which would make the issue much more complicated.

User · Answer

Convert tuple to list    gt  gt  gt  t     my    name    is    mr    tuple    gt  gt  gt  t   my    name    is    mr    tuple    gt  gt  gt  list t    my    name    is    mr    tuple     Convert list to tuple    gt  gt  gt  l     my    name    is    mr    list    gt  gt  gt  l   my    name    is    mr    list    gt  gt  gt  tuple l    my    name    is    mr    list

User · Answer

List to Tuple and back can be done as below  import ast  sys input str   sys stdin read   input tuple   ast literal eval input str   l   list input tuple  l append  Python    print l  tuple 2   tuple l     Make sure to name the final tuple  tuple 2  print tuple 2

User · Answer

You have a tuple of tuples  To convert every tuple to a list    list i  for i in level    list of lists   --- OR ---  map list  level      And after you are done editing  just convert them back   tuple tuple i  for i in edited    tuple of tuples   --- OR ---  Thanks  jamylak   tuple itertools imap tuple  edited       You can also use a numpy array    gt  gt  gt  a   numpy array level1   gt  gt  gt  a array   1  1  1  1  1  1           1  0  0  0  0  1           1  0  0  0  0  1           1  0  0  0  0  1           1  0  0  0  0  1           1  1  1  1  1  1      For manipulating   if clicked 0     1      x    mousey   cameraY     60   For readability     y    mousex   cameraX     60   For readability     a x  y    1

User · Answer

Since Python 3 5  PEP 448 -- Additional Unpacking Generalizations  one can use the following literal syntax to convert a tuple to a list   gt  gt  gt  t    1 2 3   gt  gt  gt  lst     t   gt  gt  gt  lst  1  2  3   gt  gt  gt   lst     back to tuple  1  2  3   A list comprehension can be use to convert a tuple of tuples to a list of lists   gt  gt  gt  level1               1 1 1 1 1 1             1 0 0 0 0 1             1 0 0 0 0 1             1 0 0 0 0 1             1 0 0 0 0 1             1 1 1 1 1 1    gt  gt  gt  level1 list      row  for row in level1   gt  gt  gt  level1 list   1  1  1  1  1  1      1  0  0  0  0  1      1  0  0  0  0  1      1  0  0  0  0  1      1  0  0  0  0  1      1  1  1  1  1  1    gt  gt  gt      row   for row in level1 list     1  1  1  1  1  1      1  0  0  0  0  1      1  0  0  0  0  1      1  0  0  0  0  1      1  0  0  0  0  1      1  1  1  1  1  1    gt  gt  gt       level1 True

User · Answer

Why don t you try converting its type from a tuple to a list and vice versa   level1           1 1 1 1 1 1        1 0 0 0 0 1        1 0 0 0 0 1        1 0 0 0 0 1        1 0 0 0 0 1        1 1 1 1 1 1    print level1   level1   list level1   print level1   level1   tuple level1   print level1

User · Answer

To convert tuples to list    Commas were missing between the tuples in the given question  it was added to prevent error message   Method 1    level1           1 1 1 1 1 1         1 0 0 0 0 1         1 0 0 0 0 1         1 0 0 0 0 1         1 0 0 0 0 1         1 1 1 1 1 1    level1    list row  for row in level1   print level1    Method 2   level1   map list level1   print list level1     Method 1 took --- 0 0019991397857666016 seconds ---  Method 2 took --- 0 0010001659393310547 seconds ---

User · Answer

Just using the command list did not work for me  if you have a tuple just iterate until you have the elements there are necessary and after that append to a list  And if you go to the element level you can change it easily  input  level1               1 1 1 1 1 1             1 0 0 0 0 1             1 0 0 0 0 1             1 0 0 0 0 1             1 0 0 0 0 1             1 1 1 1 1 1    level1 as list    for i in level1      inside list        for j in i          inside list append j      level1 as list append inside list   print level1 as list enter code here  output    1  1  1  1  1  1    1  0  0  0  0  1    1  0  0  0  0  1    1  0  0  0  0  1    1  0  0  0  0  1    1  1  1  1  1  1

User · Answer

Both the answers are good  but a little advice   Tuples are immutable  which implies that they cannot be changed  So if you need to manipulate data  it is better to store data in a list  it will reduce unnecessary overhead   In your case extract the data to a list  as shown by eumiro  and after modifying create a similar tuple of similar structure as answer given by Schoolboy   Also as suggested using numpy array is a better option

User · Answer

You can have a list of lists  Convert your tuple of tuples to a list of lists using   level1    list row  for row in level1    or  level1   map list  level1    and modify them accordingly   But a numpy array is cooler

[python] Convert tuple to list and back

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