Human: Write me a Python function to decode base64 text string in Python. Assistant: 
Here is a Python function to decode base64 text string

import base64

def decode_base64(s):
        """
        Decode base64 text string.
        """
        return base64.b64decode(s.encode('ascii'))

# Enter the data
s = "YQ=="

# Calling the function
print((decode_base64(s)))

#Example Output
# b'a'

#Remember to inspect code for bugs.