python - structured Python data using netmiko and Genie is returning a string instead of a dictionary

Question

I can't figure out why this line of code out = conn.send_command("show ip interface brief", use_genie=True)

is returning a string instead of dictionary as expected. how can I fix that.

Here the whole code:

from netmiko import ConnectHandler`
 import pprint

 connection_info = {
        'device_type': 'cisco_ios',
        'host': '131.226.`enter code here`217.149',
        'port': 22,
        'username': 'developer',
        'password': 'C1sco12345'
}

with ConnectHandler(**connection_info) as conn:
        out = conn.send_command_timing("show ip interface brief", use_genie=True)
        pprint.pprint(out)

        for interface in out.keys():
                print(interface)

Running this code produces an error:

Traceback (most recent call last):
  File "get_interfaces.py", line 17, in <module>
    for interface in out.keys():
AttributeError: 'str' object has no attribute 'keys'

On python interpreter, I confirmed that out is a string

>>> type(out)
<class 'str'>
>>> 

Thank you for your help. Regards