Topics

• Incompatibilities moving from Python 2 to Python 3

Examples

• Print statement vs. Print function
• Strings: Bytes versus Unicode
• Integer Division
• Reduce is no longer a built-in
• Differences between range and xrange functions
• Unpacking Iterables
• Raising and handling Exceptions
• .next() method on iterators renamed
• Comparison of different types
• User Input
• Dictionary method changes
• exec statement is a function in Python 3
• hasattr function bug in Python 2
• Renamed modules
• Octal Constants
• All classes are "new-style classes" in Python 3.
• Removed operators <> and ``, synonymous with != and repr()
• encode/decode to hex no longer available
• cmp function removed in Python 3
• Leaked variables in list comprehension
• map()
• filter(), map() and zip() return iterators instead of sequences
• Absolute/Relative Imports
• File I/O
• The round() function tie-breaking and return type
• True, False and None
• Return value when writing to a file object
• long vs. int
• Class Boolean Value