How to remove the left part of a string

Question

I have some simple python code that searches files for a string e g  path c  path  where the c  path part may vary  The current code is   def find path i file       lines   open i file  readlines       for line in lines          if line startswith  Path                 return   what to do here in order to get line content after  Path       What is a simple way to get the text after Path

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line 5     gives you characters after the first five

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Another simple one-liner that hasn t been mentioned here   value   line split  Path    1  -1    This will also work properly for various edge cases    gt  gt  gt  print  prefixfoobar  split  foo   1  -1    bar    gt  gt  gt  print  foofoobar  split  foo   1  -1    foobar    gt  gt  gt  print  foobar  split  foo   1  -1    bar    gt  gt  gt  print  bar  split  foo   1  -1    bar    gt  gt  gt  print    split  foo   1  -1

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If the string is fixed you can simply use   if line startswith  Path         return line 5     which gives you everything from position 5 on in the string  a string is also a sequence so these sequence operators work here  too    Or you can split the line at the first     if     in line      param  value   line split     1    Then param is  Path  and value is the rest after the first

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The simplest way I can think of is with slicing   def find path i file        lines   open i file  readlines        for line in lines           if line startswith  Path                   return line 5     A quick note on slice notation  it uses two indices instead of the usual one  The first index indicates the first element of the sequence you want to include in the slice and the last index is the index immediately after the last element you wish to include in the slice  Eg      sequence obj first index last index    The slice consists of all the elements between first index and last index  including first index and not last index  If the first index is omitted  it defaults to the start of the sequence  If the last index is omitted  it includes all elements up to the last element in the sequence  Negative indices are also allowed  Use Google to learn more about the topic

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For slicing  conditional or non-conditional  in general I prefer what a colleague suggested recently  Use replacement with an empty string  Easier to read the code  less code  sometimes  and less risk of specifying the wrong number of characters  Ok  I do not use Python  but in other languages I do prefer this approach   rightmost   full path replace  Path        1    or - to follow up to the first comment to this post - if this should only be done if the line starts with Path   rightmost   re compile   Path    sub     full path    The main difference to some of what has been suggested above is that there is no  magic number   5  involved  nor any need to specify both  5  and the string  Path    In other words I prefer this approach from a code maintenance point of view

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How about     gt  gt  gt  line   r path c  path   gt  gt  gt  line partition  path          path     c   path     This triplet is the head  separator  and tail

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The below method can be tried  def remove suffix string1  suffix       length   len suffix       if string1 0 length     suffix          return string1 length       else          return string1  suffix    quot hello quot  string1    quot hello world quot   final string   remove suffix string1  suffix  print  final string

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Remove prefix from a string        if line startswith prefix      return line len prefix      Split on the first occurrence of the separator via str partition    def findvar filename  varname  Path   sep            for line in open filename           if line startswith varname   sep              head  sep   tail   line partition sep    instead of  str split               assert head    varname            assert sep     sep            return tail   Parse INI-like file with ConfigParser  from ConfigParser import SafeConfigParser config   SafeConfigParser   config read filename    requires section headers to be present  path   config get section   path   raw 1    case-insensitive  no interpolation   Other options   str split   re match

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I guess this what you are exactly looking for      def findPath i file            lines   open  i file   readlines           for line in lines               if line startswith   Path                      output line line  line find  Path    len  Path                       return output line

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I prefer pop to indexing  -1    value   line split  Path    1  pop     to  value   line split  Path    1  1  param  value   line split  Path    1

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gt  gt  gt  import re   gt  gt  gt  p   re compile r path        re IGNORECASE    gt  gt  gt  path    path c  path    gt  gt  gt  re match p  path  group 1   c   path

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removeprefix   and removesuffix    string methods added in Python 3 9 due to issues associated with lstrip and rstrip interpretation of parameters passed to them  Read PEP 616 for more details    in python 3 9  gt  gt  gt  s    python 390a6     apply removeprefix    gt  gt  gt  s removeprefix  python     390a6     apply removesuffix    gt  gt  gt  s    python exe   gt  gt  gt  s removesuffix   exe    python     in python 3 8 or before  gt  gt  gt  s    python 390a6   gt  gt  gt  s lstrip  python     390a6    gt  gt  gt  s    python exe   gt  gt  gt  s rstrip   exe    python   removesuffix example with a list  plurals     cars    phones    stars    books   suffix    s   for plural in plurals      print plural removesuffix suffix    output  car phone star book  removeprefix example with a list  places     New York    New Zealand    New Delhi    New Now    shortened    place removeprefix  New    for place in places  print shortened   output    York    Zealand    Delhi    Now

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This is very similar in technique to other answers  but with no repeated string operations  ability to tell if the prefix was there or not  and still quite readable   parts   the string split prefix to remove  1       if len parts     2             do things with parts 1          pass

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Or why not  if line startswith prefix       return line replace prefix      1

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Why not using regex with escape    matches the initial part of a line and re MULTILINE matches on each line  re escape ensures that the matching is exact    gt  gt  gt  print re sub       re escape  path     repl     string  path c  path nd  path2   flags re MULTILINE   c  path d  path2

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def remove prefix text  prefix       return text len prefix    if text startswith prefix  else text

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If you know list comprehensions   lines    line 5   for line in file readlines   if line  5      Path

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Starting in Python 3 9  you can use removeprefix    Path helloworld  removeprefix  Path       helloworld

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without having a to write a function  this will split according to list  in this case  Mr  Dr  Mrs    select everything after split with  1   then split again and grab whatever element  In the case below   Morris  is returned   re split  Mr  Dr  Mrs     Mr  Morgan Morris   1  split   1

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line 5   will give the substring you want  Search the introduction and look for  slice notation

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The pop version wasn t quite right  I think you want    gt  gt  gt  print  foofoobar  split  foo   1  pop    foobar

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Try Following code   if line startswith  Path     return line 5

[python] How to remove the left part of a string?

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