DEPRECATION: Python 3.5 reached the end of its life on September 13th, 2020. Please upgrade your Python as Python 3.5 is no longer maintained. pip 21.0 will drop support for Python 3.5 in January 2021. pip 21.0 will remove support for this functionality. WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:719)'),)': /simple/tensorflow/ WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:719)'),)': /simple/tensorflow/ WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:719)'),)': /simple/tensorflow/ WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:719)'),)': /simple/tensorflow/ WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:719)'),)': /simple/tensorflow/ Could not fetch URL https://pypi.org/simple/tensorflow/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/tensorflow/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:719)'),)) - skipping ERROR: Could not find a version that satisfies the requirement tensorflow ERROR: No matching distribution found for tensorflow

这个提示表示您使用的Python版本已经不再维护，建议您升级到较新的版本。同时，pip 21.0也即将不再支持Python 3.5版本，建议您更新pip版本。另外，您安装tensorflow时出现了连接错误，您可以尝试使用以下命令安装：

pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org tensorflow

这个命令可以忽略SSL证书验证，可能会解决连接问题。如果还有问题，建议检查您的网络连接或者等待一段时间重试。