python中pip不是内部或外部命令_Python-“pip”不能识别为内部或外部命令

我在尝试在计算机上安装Django时遇到了一个奇怪的错误。

这是我在命令行中键入的序列：

C:\Python34>python get-pip.py

Requirement already up-to-date: pip in c:\python34\lib\site-packages

Cleaning up...

C:\Python34>pip install Django

'pip' is not recognized as an internal or external command,

operable program or batch file.

C:\Python34>lib\site-packages\pip install Django

'lib\site-packages\pip' is not recognized as an internal or external command,

operable program or batch file.

是什么原因造成的？

编辑

根据要求，这是我输入echo％PATH％时得到的结果

C:\Python34>echo %PATH%

C:\Program Files\ImageMagick-6.8.8-Q16;C:\Program Files (x86)\Intel\iCLS Client\

;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\S

ystem32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\

Windows Live\Shared;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Progr

am Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files\Intel\Intel(R) Mana

gement Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine C

omponents\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components

\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\P

rogram Files (x86)\nodejs\;C:\Program Files (x86)\Heroku\bin;C:\Program Files (x

86)\git\cmd;C:\RailsInstaller\Ruby2.0.0\bin;C:\RailsInstaller\Git\cmd;C:\RailsIn

staller\Ruby1.9.3\bin;C:\Users\Javi\AppData\Roaming\npm