pickle压缩文件

写了一个测试文件，使用不同的pickle压缩协议，发现gzip+3时最小，3次之， 2时最大。

测试代码如下：

import pickle, gzip  
import numpy as np
x = np.random.randn(16, 224, 224 ,)
# print(x)  
# 定义一个对象  
data = {  
    'name': 'Alice',  
    'age': 30,  
    'cities_visited': ['New York', 'Paris', 'Tokyo'],
	'datax': x  
}  
  
# 使用协议2进行pickle  
with open('compressed_pickle2.pkl', 'wb') as f:  
    pickle.dump(data, f, protocol=2)  
# 使用协议3进行pickle  
with open('compressed_pickle3.pkl', 'wb') as f:  
    pickle.dump(data, f, protocol=3)  
  
# 使用协议0进行pickle  
with open('compressed_pickle0.pkl', 'wb') as f:  
    pickle.dump(data, f, protocol=0)  

# 使用gzip 和协议2进行pickle  
with gzip.open('compressed_picklezip2.pkl', 'wb') as f:  
    pickle.dump(data, f, protocol=2)  

# 使用gzip 和协议3进行pickle  
with gzip.open('compressed_picklezip3.pkl', 'wb') as f:  
    pickle.dump(data, f, protocol=3)  

# 从文件中加载pickle数据  
with open('compressed_pickle2.pkl', 'rb') as f:  
    loaded_data = pickle.load(f)  
  
# print(loaded_data)
print(len(loaded_data), "ok")

文件大小ls -l compressed_pickle*：

-rw-r--r--  1   6945817  2 14 00:01 compressed_pickle0.pkl
-rw-r--r--  1   9989418  2 14 00:01 compressed_pickle2.pkl
-rw-r--r--  1   6422805  2 14 00:01 compressed_pickle3.pkl
-rw-r--r--  1   7483752  2 14 00:01 compressed_picklezip2.pkl
-rw-r--r--  1   6170076  2 14 00:01 compressed_picklezip3.pkl