[英]python encode/decoder for serialization/deserialization (Java's kyro equivalence in python)
我需要將python值轉換為字節數組,反之亦然。
例如:
對於Java, kryo可用於此目的: byte[] serializedValue = kryoSerializer.writeObjectData(value);
給我價值的序列化結果。
我嘗試了泡菜,但由於它消耗了6個字節來存儲整數對象,因此無法使用它。
import pickle
Foo = 256
picklestring = pickle.dumps(Foo)
print len(picklestring) # returns 6
有什么提示嗎?
# http://docs.python.org/2/library/struct.html
# http://stackoverflow.com/questions/16818463/python-encode-decoder-for-serialization-deserialization-javas-kyro-equivalence
# http://stackoverflow.com/questions/11624190/python-convert-string-to-byte-array
import struct
# >f for
def encode(value):
formatString = ""
if type(value) is float:
formatString = ">f"
elif type(value) is int:
formatString = ">i"
elif type(value) is str:
formatString = ">s"
else:
raise Exception("Wrong data input: only supports float/int/string")
packed = struct.pack(formatString, value)
result = []
for i in packed:
# i is a string
result.append(ord(i[0]))
return result
使用struct
模塊 :
>>> import struct
>>> struct.pack('>f', 1.23)
'?\x9dp\xa4'
>>> len(struct.pack('>f', 1.23))
4
結構打包遵循C約定的值; 上面的格式按big-endian順序打包一個單精度浮點值(4個字節)。
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