Huawei P8 Lite 2017 is new version of P8 lite which came with Nougat EMUI5.0 preinstalled on it. This phone belongs to Parague group of models, which starts with PRA.you can root almost all variants of P8 Lite 2017 by following the guide given below.

How to Root Huawei P8 Lite 2017

Rooting Guide:

• Enable OEM unlock
• Need sdcard
• Unlock bootloader of your phone (How to unlock?)
• Download rooting files from THIS LINK
• Copy MagiskManager-v4.3.3.apk in phone, and install it.
• Copy Magisk-v13.1.zip in sd card
• Copy BusyBox-Magisk-1.25.zip in sd card
• Extract this file, and open MAF32.exe
• Connect phone in fastboot mode (Switch off, hold volume down and insert cable ) and type ” fastboot flash recovery TWRP311.img ” press enter
• Once twrp flashed successfully hold volume up and type ” fastboot reboot ” keep holding volume up untill erecovery appears.
• Disconnect from pc, and shutdown phone, hold volume up and power until you see TWRP.
• Swipe bar to enter TWRP menu
• Tap on install and select Magisk-v13.1.zip then swipe to install (don’t reboot)
• Go back , tap on install and select BusyBox-Magisk-1.25.zip then swipe to install.
• Reboot, and open magisk and update
• Done, You phone rooted now.

Source: XDA