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The error "AttributeError: 'str' object does not have the attribute 'append'" occurs when you try to use the append() method on a string object. This method is not available for strings as they are immutable.

To resolve this error, you need to make sure that you are trying to use the append() method on a list object, not on a string object. Check that the variable you are trying to append to is a list, and if it is not, convert it to a list first.

For example, if you have a string and you want to append another string to it, you can convert it to a list first, append the new string, and then convert it back to a string:

my_string = "hello"
my_list = list(my_string)
my_list.append("world")
new_string = "".join(my_list) # convert back to a string

Alternatively, if you want to create a new list from scratch and append elements to it, make sure to initialize an empty list first:

my_list = [] # initialize an empty list
my_list.append("apple")
my_list.append("banana")

This will create a new list and append the elements "apple" and "banana" to it without any errors.