Python hash() built-in function
From the Python 3 documentation
Return the hash value of the object (if it has one). Hash values are integers. They are used to quickly compare dictionary keys during a dictionary lookup. Numeric values that compare equal have the same hash value (even if they are of different types, as is the case for 1 and 1.0).
>>> hash(1) # 1 >>> hash('1') # -3658718886659147670 >>> hash('10') # 5216539490891759533
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