[Python] opening privatekey from string rather than file in python 3?

I found some python code to read a private key from a file to connect to Snowflake and it works fine

with open("rsa_key_1.p8", "rb") as key:
p_key= serialization.load_pem_private_key(
key.read(),
password=None,
backend=default_backend()
)


However, I would like to use the actual string rather than reading from a file, so I tried replacing key.read() by the actual string

with open("rsa_key_1.p8", "rb") as key:
p_key= serialization.load_pem_private_key(
'MIIE...rZ+x8ZcfhhLj+lyWLhDfA8feg/vYlV+gLDKsZfQLN9JDRMGgffN3EE7vM9WBO/msB8fpo5g==',
password=None,
backend=default_backend()
)


But this gives me this error

TypeError: from_buffer() cannot return the address of a unicode object
​

Could this be a generic python error?

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