通常装包的时候响应半天最后告诉你失败了，http延时了什么的，
多半是包的地址在国外。
先用学校的校园网，
CondaHTTPError: HTTP 000 CONNECTION FAILED for url https://repo.anaconda.com/pkgs/main/win-64/sympy-1.4-py36_0.conda
Elapsed: -
An HTTP error occurred when trying to retrieve this URL.
HTTP errors are often intermittent, and a simple retry will get you on your way.
校园网不行，上热点，
CondaHTTPError: HTTP 000 CONNECTION FAILED for url https://repo.anaconda.com/pkgs/main/win-64/sympy-1.4-py36_0.conda
Elapsed: -
An HTTP error occurred when trying to retrieve this URL.
HTTP errors are often intermittent, and a simple retry will get you on your way.
热点还不行，那就校园网+VPN（墙）
或者热点+VPN
然后，就可以了~
Downloading and Extracting Packages
sympy-1.4 | 7.9 MB | ############################################################################ | 100%
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
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