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
