How to concatenate items in a list to a single string?

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Is there a simpler way to concatenate string items in a list into a single string? Can I use the str.join() function?

E.g. this is the input ["this","is","a","sentence"] and this is the desired output this-is-a-sentence

sentence = ["this","is","a","sentence"]
sent_str = ""
for i in sentence:
    sent_str += str(i) + "-"
sent_str = sent_str[:-1]
print sent_str

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