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< title > Python Versions Presentation< / title >
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< h1 > Introduction to Python Versions< / h1 >
< p > Brief History of Python< br >
Python 2 release in 2000< br >
Python 3 release in 2008< br >
Key differences aim to make Python more powerful and easier to use< / p >
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< div id = "slide2" class = "step" data-x = "1000" data-y = "-500" >
< h1 > Syntax Differences< / h1 >
< p > Print function< br >
Python 2: < code > print "Hello, world!"< / code > < br >
Python 3: < code > print("Hello, world!")< / code > < br >
Integer division< br >
Python 2: < code > 3/2 = 1< / code > < br >
Python 3: < code > 3/2 = 1.5< / code > < / p >
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< h1 > Unicode Support< / h1 >
< p > Python 2: Strings are ASCII by default. Unicode string with < code > u"unicode"< / code > < br >
Python 3: All strings are Unicode. Bytes type for ASCII text: < code > b"ascii"< / code > < / p >
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< h1 > Library Changes< / h1 >
< p > Changes in standard library< br >
Python 2: < code > urllib< / code > , < code > urllib2< / code > , < code > httplib< / code > < br >
Python 3: Unified under < code > urllib< / code > package< br >
Range function< br >
Python 2: < code > xrange()< / code > for efficient looping< br >
Python 3: < code > range()< / code > is now like < code > xrange()< / code > < / p >
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< h1 > Error Handling< / h1 >
< p > Syntax for exception handling< br >
Python 2: < code > except IOError, e:< / code > < br >
Python 3: < code > except IOError as e:< / code > < / p >
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< h1 > Iterators and Generators< / h1 >
< p > Enhancements in iteration< br >
Python 3 introduces new behavior for dict methods < code > .keys()< / code > , < code > .items()< / code > , and < code > .values()< / code > which return views instead of lists< / p >
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< h1 > End of Life< / h1 >
< p > Python 2 end of life in 2020< br >
No more official support or updates< br >
Encouragement to migrate to Python 3 for security and latest features< / p >
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< h1 > Migrating from Python 2 to Python 3< / h1 >
< p > Tools like < code > 2to3< / code > can help in converting Python 2 code to Python 3< br >
Considerations for maintaining compatibility< br >
Importance of testing during migration< / p >
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< h1 > Conclusion< / h1 >
< p > Python 3 offers significant improvements and is the future of Python< br >
Transitioning to Python 3 is essential for access to new features and continued support< / p >
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< div id = "slide10" class = "step" data-x = "9000" data-y = "-4500" >
< h1 > Resources< / h1 >
< p > Official Python documentation< / p >
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