如果总是出现相同的错误，如何运行pipenv？

Question

我正在Windows 10上运行“pipenv”，但它不想运行。。。错误是接收低于

PS C:\Users\charl\Documents\Python\Face Recognition> pipenv shell
pipenv : The term 'pipenv' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try       
again.
At line:1 char:1
+ pipenv shell
+ ~~~~~~
    + FullyQualifiedErrorId : CommandNotFoundException```