TypeError：需要一个类似字节的对象，而不是'int' python3

Question

我正在向 JSON 文件写入内容。它在 Python2 中运行良好。但由于引入了字节概念，它在 Python3 中失败了。所以为了让它工作，我将 str 转换为 bytes 并成功转换。之后，我检查了类型，它以字节为单位。现在 python3 再次向我显示一个错误，即使它是以字节为单位的。 我的错误：

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
PING 192.168.1.47 (192.168.1.47) 56(84) bytes of data.
64 bytes from 192.168.1.47: icmp_seq=1 ttl=64 time=0.028 ms

--- 192.168.1.47 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.028/0.028/0.028/0.000 ms
64 bytes from 8.8.8.8: icmp_seq=1 ttl=45 time=59.6 ms

--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 59.606/59.606/59.606/0.000 ms
<class 'bytes'>
b'"February 16 2019, 12:57:01":{"monitor.ip": "192.168.1.47", "monitor.status": "UP"},\n'
Traceback (most recent call last):
  File "/home/paulsteven/BEAT/stack.py", line 38, in <module>
    f.writelines(_entry)
TypeError: a bytes-like object is required, not 'int'

代码如下：

import os
from multiprocessing import Pool
import json
import datetime
import time

hosts = ["192.168.1.47", "8.8.8.8"]
MAX_NUMBER_OF_STATUS_CHECKS = 2
FILE_NAME = 'hosts_stats.json'


#
# counter and sleep were added in order to simulate scheduler activity
#

def ping(host):
    status = os.system('ping -c 1 {}'.format(host))
    return datetime.datetime.now().strftime("%B %d %Y, %H:%M:%S"), {"monitor.ip": host,
                                                                "monitor.status": 'UP' if status == 0 else 'DOWN'}


if __name__ == "__main__":
    p = Pool(processes=len(hosts))
    counter = 0
    if not os.path.exists(FILE_NAME):
        with open(FILE_NAME, 'w') as f:
            f.write('{}')
    while counter < MAX_NUMBER_OF_STATUS_CHECKS:
        result = p.map(ping, hosts)
        with open(FILE_NAME, 'rb+') as f:
            f.seek(-1, os.SEEK_END)
            f.truncate()
            for entry in result:
                _entry = '"{}":{},\n'.format(entry[0], json.dumps(entry[1]))
                _entry = _entry.encode()
                print(type(_entry))
                print(_entry)
                f.writelines(_entry)
            f.write('}')
        counter += 1
        time.sleep(2)

Answer 1

二进制模式下文件对象的writelines 方法需要一个字节对象序列作为参数，但您传递给它的只是一个字节对象，所以当writelines 方法将字节对象视为一个序列并对其进行迭代，每次迭代都会得到一个整数，因为字节对象只是一个整数序列。

您应该改用write 方法：

f.write(_entry.encode())