Python speedtest.py从cron运行时无法连接到Internet

我有以下代码

#!/usr/bin/python3.8

import subprocess
import requests
import datetime
import urllib3
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

print("=============================================================");
now = datetime.datetime.now()
print(now);

# speedtest --single --json
speedout = subprocess.run(['speedtest', '--single', '--json'], stdout=subprocess.PIPE).stdout.decode('utf-8');
print("speedtest output:"+speedout);

now = datetime.datetime.now()
print(now);
print("=============================================================");

当我手动运行它时，它会生成以下日志

=============================================================
2021-04-26 12:23:14.869085
speedtest output:{"download": 48332978.441761896, "upload": 21216098.81470209, "ping": 43.796, "server": {"url": "http://hotcaldas.lampinc.com.br:8080/speedtest/upload.php", "lat": "-17.7450", "lon": "-48.6250", "name": "Caldas Novas", "country": "Brazil", "cc": "BR", "sponsor": "Hot Caldas Internet", "id": "40200", "host": "hotcaldas.lampinc.com.br:8080", "d": 230.63111881620188, "latency": 43.796}, "timestamp": "2021-04-26T15:23:15.343030Z", "bytes_sent": 26738688, "bytes_received": 60631816, "share": null, "client": {"ip": "179.xxx.xxx.14", "lat": "-1xxx", "lon": "-4xxx", "isp": "Vivo", "isprating": "3.7", "rating": "0", "ispdlavg": "0", "ispulavg": "0", "loggedin": "0", "country": "BR"}}
2021-04-26 12:23:39.011183
=============================================================

ERROR: Unable to connect to servers to test latency.
=============================================================
2021-04-26 13:00:01.687964
speedtest output:
2021-04-26 13:00:13.539705
=============================================================

但当我把它放在crontab上（在我的帐户下）每小时运行时：

0 * * * *         /myscripts/monitors/speedtest.py >> /mylogs/speedtest.log 2>&1

它生成以下日志

=============================================================
2021-04-26 12:23:14.869085
speedtest output:{"download": 48332978.441761896, "upload": 21216098.81470209, "ping": 43.796, "server": {"url": "http://hotcaldas.lampinc.com.br:8080/speedtest/upload.php", "lat": "-17.7450", "lon": "-48.6250", "name": "Caldas Novas", "country": "Brazil", "cc": "BR", "sponsor": "Hot Caldas Internet", "id": "40200", "host": "hotcaldas.lampinc.com.br:8080", "d": 230.63111881620188, "latency": 43.796}, "timestamp": "2021-04-26T15:23:15.343030Z", "bytes_sent": 26738688, "bytes_received": 60631816, "share": null, "client": {"ip": "179.xxx.xxx.14", "lat": "-1xxx", "lon": "-4xxx", "isp": "Vivo", "isprating": "3.7", "rating": "0", "ispdlavg": "0", "ispulavg": "0", "loggedin": "0", "country": "BR"}}
2021-04-26 12:23:39.011183
=============================================================

ERROR: Unable to connect to servers to test latency.
=============================================================
2021-04-26 13:00:01.687964
speedtest output:
2021-04-26 13:00:13.539705
=============================================================

请注意错误消息是如何在第一个

=============

会发生什么

更新。我为所有打印添加了flush=True。它曾经奏效，但现在又失败了。现在错误消息改变了

=============================================================
2021-04-26 16:00:01.943727
ERROR: Unable to connect to servers to test latency.
speedtest output:
2021-04-26 16:00:03.616226
=============================================================

---

您打算在虚拟环境中运行吗？不，它在我的本地服务器上运行。我打算将其输出存储在一个变量上，并将其发送到一个Web服务，在那里我提取一些数据并存储在Postgres上。请将

flush=true

添加到打印中。如果您以root身份运行

speedtest.py

，它成功了吗？它似乎与flush=true一起工作。我减少到15分钟，以进行更多的测试。打印是否会影响subprocess.run（）？在没有打印之前，我把它添加到日志中，因为我在DB上什么都没有得到。