Remove a prefix from a string

Question

I am trying to do the following  in a clear pythonic way   def remove prefix str  prefix       return str lstrip prefix   print remove prefix  template extensions    template      This gives   xtensions   Which is not what I was expecting  extensions   Obviously  stupid me   because I have used lstrip wrongly  lstrip will remove all characters which appear in the passed chars string  not considering that string as a real string  but as  a set of characters to remove from the beginning of the string    Is there a standard way to remove a substring from the beginning of a string

User · Answer

Short and sweet   def remove prefix text  prefix       return text text startswith prefix  and len prefix

User · Answer

I don t know about  standard way     def remove prefix text  prefix       if text startswith prefix           return text len prefix        return text    or whatever   As noted by  Boris and  Stefan  on Python 3 9  you can use  text removeprefix prefix    with the same behavior

User · Answer

What about this  a bit late    def remove prefix s  prefix       return s len prefix    if s startswith prefix  else s

User · Answer

regex solution  The best way is the solution by  Elazar this is just for fun   import re def remove prefix text  prefix       return re sub r   0   format re escape prefix        text    gt  gt  gt  print remove prefix  template extensions    template    extensions

User · Answer

def remove prefix str  prefix       if str startswith prefix           return str len prefix        else          return str   As an aside note  str is a bad name for a variable because it shadows the str type

User · Answer

I think you can use methods of the str type to do this  There s no need for regular expressions   def remove prefix text  prefix       if text startswith prefix     only modify the text if it starts with the prefix          text   text replace prefix      1    remove one instance of prefix     return text

[python] Remove a prefix from a string

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