pythone upgrade all installed packages 更新所有已安裝的packages

pip freeze --local | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 pip install -U

pip3 freeze --local | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 pip3 install -U

另外一種方式也是可以的...

pip install -U $(pip3 freeze |awk '{split($0,a,"=="); print a[1]}')

pip3 install -U $(pip3 freeze |awk '{split($0,a,"=="); print a[1]}')

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