Human: Write me a Python program for a lower each dict key. Assistant: 
Here is a Python program for a lower each dict key

import collections

def _lower_keys(d):
    """
    Lower each dict key.
    """
    return {k.lower(): v for k, v in list(d.items())}

# Enter the dictionary
d = collections.OrderedDict()

# Enter the key and value
d['key1'] = 'value1'
d['key2'] = 'value2'

# Calling pop function
d.pop('key1')

# Printing the dictionary
print(d)

# Calling the function
print((_lower_keys(d)))

#Example Output
# OrderedDict([('key2', 'value2')])
# {'key2': 'value2'}

#Remember to inspect code for bugs.