[python] 從python2.x遷移到python3.x的常見操作
阿新 • • 發佈：2018-11-04
print 'something'>print('something')xrange()>range()- 除法division
python 2.x : 整數 / 整數
python 3.x : 整數 // 整數
這個很難發現，因為python弱型別。
python2.x中/是classic division，和C++一樣，所以兩個整數運算元會有整數結果，特別是可以自動取整。在python3.x中/是浮點除法，結果是浮點數，//是整數除法。
python 2.x : integer / integer
python 3.x : integer // integer
this bug is hard to find as we cannot check the types since python does not require explicit declaration.
/in python 2.x is the class division the same as in C++. Hence two integers as operands result in an integer. If the inherent flooring feature is desired, awareness should be raised when transferring to python 3.x. In python 3,/is used as merely float division and will produce a float in the above case, so//should be used to replace it because it supports the integer division.