How can I make this function faster?

[Brennan]

Hi, I want to optimize this function and make it faster (if possible). Please let me know if there is a better way of doing this. Thanks!

# Reading data from a YML file.
def read(value):
    raw = open(file)
    reader = yaml.safe_load(raw)
    separate = value.split(".")
    i = 0
    x = reader.get(separate[i])
    for i in enumerate(separate):
        if isinstance(x, dict):
            try:
                num = (i[0] + 1)
                x = x.get(separate[num])
            except IndexError:
                return x
    return x