<｜begin▁of▁sentence｜>### Instruction:
As a Cyber Forensic Analyst, you're tasked with investigating digital crimes, data breaches, and cyber attacks to gather evidence for legal proceedings or law enforcement investigations. During your analysis, you encounter a multidict containing items such as [('key1', 'value1'), ('key2', 'value2'), ('key2', 'value3')]. To determine the number of distinct keys in this multidict, you might employ the `keys()` method within your investigation toolkit.
### Response:
from multidict import MultiDict

# Create a MultiDict object
md = MultiDict([('key1', 'value1'), ('key2', 'value2'), ('key2', 'value3')])

# Use __len__ to get the number of distinct keys
number_of_keys = len(md)
print('Number of distinct keys:', number_of_keys)
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