Using Python String Formatting with Lists

Question

I construct a string s in Python 2 6 5 which will have a varying number of  s tokens  which match the number of entries in list x  I need to write out a formatted string  The following doesn t work  but indicates what I m trying to do  In this example  there are three  s tokens and the list has three entries   s     s BLAH  s FOO  s BAR  x     1    2    3   print s    x    I d like the output string to be   1 BLAH 2 FOO 3 BAR

User · Answer

x     1    2    3   s   f  x 0   BLAH  x 1   FOO  x 2   BAR  print s    The output is  1 BLAH 2 FOO 3 BAR

User · Answer

The same as  neobot s answer but a little more modern and succinct     gt  gt  gt  l   range 5   gt  gt  gt     amp    join        len l   format  l   0  amp  1  amp  2  amp  3  amp  4

User · Answer

You should take a look to the format method of python  You could then define your formatting string like this     gt  gt  gt  s     0  BLAH BLAH  1  BLAH  2  BLAH BLIH BLEH   gt  gt  gt  x     1    2    3    gt  gt  gt  print s format  x   1 BLAH BLAH 2 BLAH 3 BLAH BLIH BLEH

User · Answer

This was a fun question  Another way to handle this for variable length lists is to build a function that takes full advantage of the  format method and list unpacking  In the following example I don t use any fancy formatting  but that can easily be changed to suit your needs   list 1    1 2 3 4 5 6  list 2    1 2 3 4 5 6 7 8     Create a function that can apply formatting to lists of any length  def ListToFormattedString alist         Create a format spec for each item in the input  alist         E g   each item will be right-adjusted  field width 3      format list        gt 3   for item in alist          Now join the format specs into a single string        E g       gt 3      gt 3      gt 3   if the input list has 3 items      s       join format list         Now unpack the input list  alist  into the format string  Done      return s format  alist     Example output   gt  gt  gt ListToFormattedString list 1     1   2   3   4   5   6   gt  gt  gt ListToFormattedString list 2     1   2   3   4   5   6   7   8

User · Answer

Following this resource page  if the length of x is varying  we can use        join     2f   len x     to create a place holder for each element from the list x  Here is the example   x    1 3 0  1 6 0  0 678  s     elements in the list are         join     2f   len x          tuple x  print s  gt  gt  gt  elements in the list are  0 33  0 17  0 68

User · Answer

print s   tuple x    instead of   print s    x

User · Answer

Here is a one liner  A little improvised answer using format with print   to iterate a list    How about this  python 3 x    sample list     cat    dog    bunny    pig   print  Your list of animals are             and     format  sample list     Read the docs here on using format

User · Answer

Since I just learned about this cool thing indexing into lists from within a format string  I m adding to this old question    s     x 0   BLAH  x 1   FOO  x 2   BAR  x     1    2    3   print  s format  x x     Output   1 BLAH 2 FOO 3 BAR   However  I still haven t figured out how to do slicing inside of the format string    x 2 4    format      and would love to figure it out if anyone has an idea  however I suspect that you simply cannot do that

[python] Using Python String Formatting with Lists

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