python modify item in list save back in list

Question

I have a hunch that I need to access an item in a list  of strings   modify that item  as a string   and put it back in the list in the same index  I m having difficulty getting an item back into the same index  for item in list      if  foo  in item          item   replace all item  replaceDictionary          list item    item         print item   now I get an error   TypeError  list indices must be integers  not str   due to this line list item    item  which makes sense  but I do not know how to put the item back into the list at that same index using python  what is the syntax for this  Ideally the for loop can keep track of the index I am currently at

User · Answer

For Python 3   ListOfStrings      ListOfStrings append  foo   ListOfStrings append  oof   for idx  item in enumerate ListOfStrings   if  foo  in item      ListOfStrings idx     bar

User · Answer

You need to use the enumerate function  python docs  for place  item in enumerate list       if  foo  in item          item   replace all item  replaceDictionary          list place    item         print item   Also  it s a bad idea to use the word list as a variable  due to it being a reserved word in python   Since you had problems with enumerate  an alternative from the itertools library   for place  item in itertools zip itertools count 0   list       if  foo  in item          item   replace all item  replaceDictionary          list place    item         print item

User · Answer

A common idiom to change every element of a list looks like this   for i in range len L        item   L i            compute some result based on item         L i    result   This can be rewritten using enumerate   as   for i  item in enumerate L             compute some result based on item         L i    result   See enumerate

User · Answer

You could do this   for idx  item in enumerate list      if  foo  in item         item   replace all             list idx    item

[python] python modify item in list, save back in list

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