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A KeyError is raised when a value is not found as a key of a dictionary. The given code is rewritten as follows to catch the exception and find its type.
import sys
try:
s = {'a':5, 'b':7}['c']
except:
print (sys.exc_info())
OUTPUT
(<type 'exceptions.KeyError'>, KeyError('c',), <traceback object at
0x0000000003203748>)