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Asked by Santosh Last Modified
Answer 
Python 3.6 and later versions have a more efficient implementation of dictionaries, which can lead to faster execution of code that relies heavily on dictionary operations. Additionally, Python 3.x has better support for asynchronous programming, which can improve the performance of I/O-bound applications.
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Python 3.x is generally faster than Python 2.7 due to better memory management, optimized integer operations, and efficient iteration.
for example:
# Python 2.7 (slower)
print sum(x*x for x in xrange(10**6))
# Python 3.x (faster)
print(sum(x*x for x in range(10**6))) # Uses a generator, reducing memory usage
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