str object does not support item assignment in Python

Question

I would like to read some characters from a string and put it into other string   Like we do in C    So my code is like below   import string import re str    Hello World  j   0 srr      for i in str      srr j    i   str  object does not support item assignment      j   j   1 print  srr    In C the code may be  i   j   0   while str i       0     srr j      str  i         How can I implement the same in Python

User · Answer

Python strings are immutable so what you are trying to do in C will be simply impossible in python. You will have to create a new string.

I would like to read some characters from a string and put it into other string.

Then use a string slice:

>>> s1 = 'Hello world!!'
>>> s2 = s1[6:12]
>>> print s2
world!

User · Answer

As aix mentioned - strings in Python are immutable  you cannot change them inplace    What you are trying to do can be done in many ways     Copy the string  foo    Hello  bar   foo    Create a new string by joining all characters of the old string  new string      join c for c in oldstring     Slice and copy new string   oldstring

User · Answer

Hi you should try the string split method   i    Hello world  output   i split    j    is not enough   print  The   output 1   j

User · Answer

In Python  strings are immutable  so you can t change their characters in-place   You can  however  do the following   for i in str      srr    i   The reasons this works is that it s a shortcut for   for i in str      srr   srr   i   The above creates a new string with each iteration  and stores the reference to that new string in srr

User · Answer

The other answers are correct  but you can  of course  do something like    gt  gt  gt  str1    mystring   gt  gt  gt  list1   list str1   gt  gt  gt  list1 5     u   gt  gt  gt  str1      join list1   gt  gt  gt  print str1  mystrung  gt  gt  gt  type str1   lt type  str  gt    if you really want to

User · Answer

How about this solution   str  Hello World   as stated in problem  srr   str

User · Answer

Another approach if you wanted to swap out a specific character for another character   def swap input string      if len input string     0       return input string    if input string 0      x        return  y    swap input string 1       else       return input string 0    swap input string 1

[python] 'str' object does not support item assignment in Python

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