Could not fetch URL https://pypi.python.org/simple/apache-flink/: There was a problem confirming the ssl certificate: Can’t connect to HTTPS URL because the SSL module is not available. - skipping
pip3 install -U pip
pip install --upgrade pip
pip3 install apache-flink 1.12.0

在尝试通过pip3安装Apache Flink时遇到SSL证书确认问题,无法连接到HTTPS URL。建议先更新pip3,然后升级pip,最后尝试安装Apache Flink 1.12.0。
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