ERROR: Could not find a version that satisfies the requirement virtualenv (from versions: none）
在Windows下安裝virtualenv 時，碰到了如下問題 這是由於網絡不穩定，因此在安裝模塊時，指定國內鏡像 其后指定的 --trusted-host pypi.do ...
原文：Could not find a version that satisfies the requirement Werkzeug>=0.15 (from flask) (from versions: none)的解決
在dos命令窗口輸入pip install flask遇到錯誤 錯誤： ERROR: Could not find a version that satisfies the requirement Werkzeug gt . from flask from versions: none ERROR: No matching distribution found for Werkzeug gt . ...
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