python在内存中读写str和二进制数据的方法

# 利用python在内存中读写str和二进制数据
from io import StringIO
from io import BytesIO
 
f = StringIO()
print(f.write('hello ')) # 6
print(f.write('world!')) # 6
print(f.getvalue()) # hello world!
 
f = BytesIO()
print(f.write('中文'.encode('utf-8'))) # 6
print(f.getvalue()) # b'\xe4\xb8\xad\xe6\x96\x87'

# -*- coding: utf-8 -*-
"""
Created on Tue Dec 3 14:38:04 2019
@author: xuguanghui
"""
 
import numpy as np
 
mlplib_label = r"C:\Users\xuguanghui\Desktop\106421_mlplib.lab"
train_label = r"C:\Users\xuguanghui\Desktop\106421_train.lab"
mlplib_txt = r"C:\Users\xuguanghui\Desktop\106421_mlplib.txt"
train_txt = r"C:\Users\xuguanghui\Desktop\106421_train.txt"
 
mlplib_lab = np.fromfile(mlplib_label, dtype=np.int32).reshape(-1, 892)
train_lab = np.fromfile(train_label, dtype=np.float32).reshape(-1, 892)
 
np.savetxt(mlplib_txt, mlplib_lab, fmt='%d')
np.savetxt(train_txt, train_lab, fmt='%d')