Output first 100 characters in a string

Question

Can seem to find a substring function in python   Say I want to output the first 100 characters in a string  how can I do this    I want to do it safely also  meaing if the string is 50 characters it shouldn t fail

User · Answer

To answer Philipp s concern   in the comments    slicing works ok for unicode strings too   gt  gt  gt  greek u a   de           p  st f      gt  gt  gt  print len greek  25  gt  gt  gt  print greek  10  a   de        If you want to run the above code as a script  put this line at the top    - - coding  utf-8 - -   If your editor doesn t save in utf-8  substitute the correct encoding

User · Answer

Most of previous examples will raise an exception in case your string is not long enough   Another approach is to use   yourstring  ljust 100   100  strip     This will give you first 100 chars  You might get a shorter string in case your string last chars are spaces

User · Answer

Slicing of arrays is done with  first last 1    One trick I tend to use a lot of is to indicate extra information with ellipses  So  if your field is one hundred characters  I would use   if len s   lt   100      print s else      print   s      s  97     And yes  I know    is superfluous in this case for the   formatting operator  it s just my style

User · Answer

String formatting using   is a great way to handle this  Here are some examples   The formatting code   s  converts  12345  to a string  but it s already a string    gt  gt  gt    s     12345    12345       3s  specifies to use only the first three characters    gt  gt  gt     3s     12345    123       7s  says to use the first seven characters  but there are only five  No problem    gt  gt  gt     7s     12345    12345      7s  uses up to seven characters  filling missing characters with spaces on the left    gt  gt  gt    7s     12345      12345      -7s  is the same thing  except filling missing characters on the right    gt  gt  gt    -7s     12345    12345        5 3  says use the first three characters  but fill it with spaces on the left to total five characters    gt  gt  gt    5 3s     12345      123    Same thing except filling on the right    gt  gt  gt    -5 3s     12345    123      Can handle multiple arguments too    gt  gt  gt   do u no  -4 3sda 3 2s wae      12345   6789    do u no 123 da 67 wae    If you require even more flexibility  str format   is available too  Here is documentation for both

User · Answer

print my string 0 100

User · Answer

start stop step    So If you want to take only 100 first character  use your string 0 100  or your string  100  If you want to take only the character at even position  use your string   2  The  default values  for start is 0  for stop - len of string  and for step - 1  So when you don t provide one of its and put      it ll use it default value

User · Answer

From python tutorial      Degenerate slice indices are handled   gracefully  an index that is too large   is replaced by the string size  an   upper bound smaller than the lower   bound returns an empty string    So it is safe to use x  100

User · Answer

Easy   print mystring  100

[python] Output first 100 characters in a string

Examples related to python