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Python 2 released in 2000; legacy code, no longer supported after 2020.
+Python 3 introduced in 2008; the future of Python, ongoing support.
+Key differences in syntax, libraries, and error handling.
+Python 2: Print statement print "Hello, world"
Python 3: Print function print("Hello, world")
Python 2: Dividing two integers results in an integer. 3 / 2 = 1
Python 3: Division results in a float. 3 / 2 = 1.5
Use //
in Python 3 for integer division.
Python 2: Strings are ASCII by default.
+Python 3: Strings are Unicode by default.
+Better support for non-English languages and symbols in Python 3.
+Python 2: xrange()
, print
, except Exception, e:
Python 3: range()
, print()
, except Exception as e:
More intuitive and consistent syntax in Python 3.
+Python 2: Libraries may not be compatible with Python 3.
+Python 3: A large number of Python 2 libraries have been updated or replaced.
+Improved and more modern standard library in Python 3.
+Python 2: Less strict about mixing types (e.g., bytes/str).
+Python 3: Strict type checking, leading to fewer subtle bugs.
+Python 3 offers significant improvements and future-proofing.
+Migrating from Python 2 to 3 requires careful consideration but is encouraged for long-term projects.
+Use tools like 2to3
for code translation and testing.
Python.org documentation
+"Porting to Python 3" guide
+Online tutorials and forums
+