python import error WindowsError: [Error 126] -

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import nfc
when import nfc in python editor ,it can't import ,why?? 

traceback (most recent call last): file "<stdin>", line 1, in module file "e:\python27\lib\site-packages\nfc\__init__.py", line 22, in <module> . import clf file "e:\python27\lib\site-packages\nfc\clf\__init__.py", line 25, in <module> . import device file "e:\python27\lib\site-packages\nfc\clf\device.py", line 32, in <module> . import transport  file "e:\python27\lib\site-packages\nfc\clf\transport.py", line 31, in <module> import usb1 libusb file "e:\python27\lib\site-packages\usb1\__init__.py", line 61, in <module> . import libusb1   file "e:\python27\lib\site-packages\usb1\libusb1.py", line 173,in_loadlibrary   return dll_loader('libusb-1.0' + suffix, **loader_kw) file "e:\python27\lib\ctypes\__init__.py", line 362, in __init__ self._handle = _dlopen(self._name, mode)    windowserror: [error 126]

when pip install nfcpy

 e:\python27\scripts>pip install nfcpy  requirement satisfied: nfcpy in e:\python27\lib\site-packages  requirement satisfied: libusb1 in e:\python27\lib\site-packages (from nfcpy)  requirement satisfied: pydes in e:\python27\lib\site-packages (from nfcpy)  requirement satisfied: pyserial in e:\python27\lib\site-packages (from nfcpy)  requirement satisfied: ndeflib in e:\python27\lib\site-packages (from nfcpy)


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