Examples for string find in Python

Question

I am trying to find some examples but no luck  Does anyone know of some examples on the net  I would like to know what it returns when it can t find  and how to specify from start to end  which I guess is going to be 0  -1

User · Answer

If you want to search for the last instance of a string in a text, you can run rfind.

Example:

   s="Hello"
   print s.rfind('l')

output: 3

*no import needed

Complete syntax:

stringEx.rfind(substr, beg=0, end=len(stringEx))

User · Answer

From the documentation    str find sub   start   end          Return the lowest index in the string where substring sub is found within the slice s start end   Optional arguments start and end are interpreted as in slice notation  Return -1 if sub is not found    So  some examples    gt  gt  gt  my str    abcdefioshgoihgs sijsiojs    gt  gt  gt  my str find  a   0  gt  gt  gt  my str find  g   10  gt  gt  gt  my str find  s   11  15  gt  gt  gt  my str find  s   15  15  gt  gt  gt  my str find  s   16  17  gt  gt  gt  my str find  s   11  14  -1

User · Answer

find       sub   start   end     Return the lowest index in the string where substring sub is found  such that sub is contained in the range  start  end   Optional arguments start and end are interpreted as in slice notation  Return -1 if sub is not found    From the docs

User · Answer

I m not sure what you re looking for  do you mean find      gt  gt  gt  x    Hello World   gt  gt  gt  x find  World   6  gt  gt  gt  x find  Aloha    -1

User · Answer

Try this   with open file dmp path   rb   as file  fsize   bsize   os path getsize file dmp path  word len   len SEARCH WORD  while True      p   file read bsize  find SEARCH WORD      if p  gt  -1          pos dec   file tell   -  bsize - p          file seek pos dec   word len          bsize   fsize - file tell       if file tell    lt  fsize          seek   file tell   - word len   1         file seek seek      else          break

User · Answer

if x is a string and you search for y which also a string  their is two cases   case 1  y is exist in x so  x find y    the index  the position  of the y in x   case 2  y is not exist so   x find  y    -1 this mean y is not found in x

User · Answer

Honestly  this is the sort of situation where I just open up Python on the command line and start messing around     gt  gt  gt  x    Dana Larose is playing with find      gt  gt  gt  x find  Dana    0   gt  gt  gt  x find  ana    1   gt  gt  gt  x find  La    5   gt  gt  gt  x find  La   6   -1   Python s interpreter makes this sort of experimentation easy    Same goes for other languages with a similar interpreter

User · Answer

you can use str index too    gt  gt  gt   sdfasdf  index  cc   Traceback  most recent call last     File   lt pyshell 144 gt    line 1  in  lt module gt       sdfasdf  index  cc   ValueError  substring not found  gt  gt  gt   sdfasdf  index  df   1

User · Answer

Try myString    abcabc  myString find  a    This will give you the index

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