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Modifying Strings

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Strings are immutable, meaning they can’t be modified. In this lesson, you’ll learn how to accomplish changing strings by generating a copy of the original string instead:

>>>
>>> s = 'mybacon'
>>> s[2] = 'f'
Traceback (most recent call last):
  File "<input>", line 1, in <module>
    s[2] = 'f'
TypeError: 'str' object does not support item assignment

Here’s how to copy a string:

>>>
>>> s = 'mybacon'
>>> s = s[:2] + 'f' + s[3:]
>>> s
'myfacon'
>>> s = 'mybacon'
>>> s = s.replace('b', 'f')
>>> s
'myfacon'

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