[Python] "TypeError: list indices must be integers" when iterating over a list

I would like to do something like this:

stuff = ['Foo', 'Bar']

someString = ''
for i in stuff:
someString += stuff

print(someString)
# -> FooBar


But I get an error from the line containing stuff:

TypeError: list indices must be integers, not str
​

I tried to change it to string like this:

someString += str(stuff)


but still get the same error.

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