How to interpret this strange Python routine coding format

I came across a strange format of Python code about routine. What is the actual meaning?

def get_values() -> list:
    query = "select value from table"
    result = db.execute(query)
    return [ value[0] for value in result ]

I think the -> list means this routine returns data type list but I don't understand how the return (build a list)? Why it is value[0]?

source https://stackoverflow.com/questions/72069885/how-to-interpret-this-strange-python-routine-coding-format

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