Django python2和python3的区别

查看django源码six.py,发现Django在python2和python3的区别：

if?PY3:
????string_types?=?str,????integer_types?=?int,????class_types?=?type,????text_type?=?str
????binary_type?=?bytes

????MAXSIZE?=?sys.maxsize
else:
????string_types?=?basestring,????integer_types?=?(int,?long)
????class_types?=?(type,?types.ClassType)
????text_type?=?unicode
????binary_type?=?str
????
????#?判断是不是Jython
????if?sys.platform.startswith("java"):
????????#?Jython?always?uses?32?bits.
????????MAXSIZE?=?int((1?<<?31)?-?1)
????else:
????????#?It's?possible?to?have?sizeof(long)?!=?sizeof(Py_ssize_t).
????????class?X(object):

????????????def?__len__(self):
????????????????return?1?<<?31
????????try:
????????????len(X())
????????except?OverflowError:
????????????#?32-bit
????????????MAXSIZE?=?int((1?<<?31)?-?1)
????????else:
????????????#?64-bit
????????????MAXSIZE?=?int((1?<<?63)?-?1)
????????del?X

从代码可以看出Django在py2和py3区别还是挺明显

（编辑：李大同）

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