How to print a string at a fixed width

Question

I have this code  printing the occurrence of the all permutations in  a string   def splitter str       for i in range 1  len str            start   str 0 i          end   str i           yield  start  end          for split in splitter end               result    start              result extend split              yield result      el       string    abcd  for b in splitter  abcd        el extend b    unique    sorted set el     for prefix in unique      if prefix                print  value      prefix     - num of occurrences         string count str prefix      I want to print all the permutation occurrence there is in string varaible   since the permutation aren t in the same length i want to fix the width and print it in a nice not like this one   value   a - num of occurrences      1 value   ab - num of occurrences      1 value   abc - num of occurrences      1 value   b - num of occurrences      1 value   bc - num of occurrences      1 value   bcd - num of occurrences      1 value   c - num of occurrences      1 value   cd - num of occurrences      1 value   d - num of occurrences      1   How can I use format to do it    I found these posts but it didn t go well with alphanumeric strings   python string formatting fixed width  Setting fixed length with python

User · Answer

gt  gt  gt  print f quot   123   lt 4 56789 quot   123 56789

User · Answer

I find using str format much more elegant   gt  gt  gt    0   lt 5   format  s    s       gt  gt  gt    0   lt 5   format  ss    ss      gt  gt  gt    0   lt 5   format  sss    sss     gt  gt  gt    0   lt 5   format  ssss    ssss    gt  gt  gt    0   lt 5   format  sssss    sssss   If you want to align the string to the right use  gt  instead of  lt    gt  gt  gt    0   gt 5   format  ss       ss    Edit 1  As mentioned in the comments  the 0 in   0   lt 5   indicates the argument   s index passed to str format     Edit 2  In python3 one could use also f-strings  sub str  s  for i in range 1 6       s   sub str i     print f  s  gt 5              s      ss     sss    ssss   sssss   or  for i in range 1 5       s   sub str i     print f  s  lt 5     s       ss      sss     ssss    sssss   of note  in some places above       single quotation marks  were added to emphasize the width of the printed strings

User · Answer

I found ljust   and rjust   very useful to print a string at a fixed width or fill out a Python string with spaces  An example print  123 00  rjust 9   print  123456 89  rjust 9      expected output      123 00 123456 89  For your case  you case use fstring to print for prefix in unique      if prefix     quot  quot           print f quot value   prefix ljust 3   - num of occurrences    string count str prefix    quot    Expected Output value  a   - num of occurrences   1 value  ab  - num of occurrences   1 value  abc - num of occurrences   1 value  b   - num of occurrences   1 value  bc  - num of occurrences   1 value  bcd - num of occurrences   1 value  c   - num of occurrences   1 value  cd  - num of occurrences   1 value  d   - num of occurrences   1  You can change 3 to the highest length of your permutation string

User · Answer

EDIT 2013-12-11 - This answer is very old  It is still valid and correct  but people looking at this should prefer the new format syntax   You can use string formatting like this    gt  gt  gt  print   5s     aa     aa  gt  gt  gt  print   5s     aaa    aaa  gt  gt  gt  print   5s     aaaa   aaaa  gt  gt  gt  print   5s     aaaaa  aaaaa   Basically    the   character informs python it will have to substitute something to a token the s character informs python the token will be a string the 5  or whatever number you wish  informs python to pad the string with spaces up to 5 characters    In your specific case a possible implementation could look like    gt  gt  gt  dict      a   1   ab   1   abc   1   gt  gt  gt  for item in dict  items            print  value  3s - num of occurances    d    item    d is the token of integers      value   a - num of occurances   1 value  ab - num of occurances   1 value abc - num of occurances   1   SIDE NOTE  Just wondered if you are aware of the existence of the itertools module  For example you could obtain a list of all your combinations in one line with    gt  gt  gt      join perm  for i in range 1  len s   for perm in it permutations s  i     a    b    c    d    ab    ac    ad    ba    bc    bd    ca    cb    cd    da    db    dc    abc    abd    acb    acd    adb    adc    bac    bad    bca    bcd    bda    bdc    cab    cad    cba    cbd    cda    cdb    dab    dac    dba    dbc    dca    dcb     and you could get the number of occurrences by using combinations in conjunction with count

User · Answer

Originally posted as an edit to  0x90 s answer  but it got rejected for deviating from the post s original intent and recommended to post as a comment or answer  so I m including the short write-up here   In addition to the answer from  0x90  the syntax can be made more flexible  by using a variable for the width  as per  user2763554 s comment    width 10   0   lt  width    format  sss   width width    Further  you can make this expression briefer  by only using numbers and relying on the order of the arguments passed to format   width 10   0   lt  1    format  sss   width    Or even leave out all numbers for maximal  potentially non-pythonically implicit  compactness   width 10      lt      format  sss   width      Update 2017-05-26  With the introduction of formatted string literals   f-strings  for short  in Python 3 6  it is now possible to access previously defined variables with a briefer syntax    gt  gt  gt  name    Fred   gt  gt  gt  f He said his name is  name     He said his name is Fred     This also applies to string formatting   gt  gt  gt  width 10  gt  gt  gt  string    sss   gt  gt  gt  f  string   lt  width     sss

User · Answer

This will Help to Keep a fixed length when you want to print several elements at one print statement 25s format a string with 25 spaces  left justified by default 5d format an integer reserving 5 spaces  right justified by default members   quot Niroshan quot   quot Brayan quot   quot Kate quot   print  quot                                                                    quot   print    25s    32s    35s    format  quot Name quot   quot Country quot   quot Age quot    print  quot                                                                    quot   print    25s    30s    5d    format members 0   quot Srilanka quot  20   print    25s    30s    5d    format members 1   quot Australia quot  25   print    25s    30s    5d    format members 2   quot England quot  30   print  quot                                                                    quot    25s format a string with 25 spaces  left justified by default 5d format an integer reserving 5 spaces  right justified by default And this will print                                                                    Name                      Country                          Age                                                                    Niroshan                  Srilanka                          20 Brayan                    Australia                         25 Kate                      England                           30

User · Answer

format is definitely the most elegant way  but afaik you can t use that with python s logging module  so here s how you can do it using the   formatting   formatter   logging Formatter      fmt    asctime s     name -20s     levelname -10s     message s       Here  the - indicates left-alignment  and the number before s indicates the fixed width   Some sample output   2017-03-14 14 43 42 581   this-app               INFO         running main 2017-03-14 14 43 42 581   this-app aux           DEBUG        5 is an int  2017-03-14 14 43 42 581   this-app aux           INFO         hello 2017-03-14 14 43 42 581   this-app               ERROR        failed running main   More info at the docs here  https   docs python org 2 library stdtypes html string-formatting-operations

[python] How to print a string at a fixed width?

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