Human: function lowercase variable name. Assistant: 
Here is a Python function to lowercase variable name

import collections

def lower_case(text):
    """Convert to camel case.

    :param str text:
    :rtype: str
    :return:
    """
    return text.lower()

# Enter the string
string = "This is a string"

# Calling the function
print((lower_case(string)))

#Example Output
# this is a string

#Remember to inspect code for bugs.