Python Script in UE 4.25

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from UE 4.19, python is supported
in Edit > Plugins : Script Tab, there is new Python Script support, enable it and restart;
Then show it in Windows> Develop Tools > Output Log, you can switch the cmd to Python in the command box
- check its python version with
```
pyMode = '.'.join([ str(n) for n in sys.version_info[:3] ])
print("Python: {0}".format(pyMode))
```
- it is 2.7.14,

the Python path is at UE version installed folder

\your_install_path_to_UE_sub_version\UE_4.25\Engine\Binaries\ThirdParty\Python\Win64

pip module is built-in with the python in UE, so you can install PySide/PySide2 using pip
cd to UE4 python directory as above, use print(os) to see its path, run cmd
```
.\python.exe -m pip install -U pip
.\python.exe -m pip install PySide
```

run the custom widget directly with UI creation, need create QApplication

import unreal
import sys;myPath='/python_to_tool/TmpTest/';myPath in sys.path or sys.path.append(myPath);import TmpTest;
 
unreal_app = QtGui.QApplication.instance()
if not unreal_app:
    unreal_app = QtGui.QApplication(sys.argv)
single_TmpTest = TmpTest.TmpTest()
unreal.parent_external_window_to_slate(single_TmpTest.winId())

UE 4.25 on windows 7 pop up error issue

Solution: https://forums.unrealengine.com/unreal-engine/feedback-for-epic/1760216-dxgigetdebuginterface1-could-not-be-located-in-dynamic-library-dxgi-dll

Unreal working speed-up tips
- view > detail mode : low
- view > enable particle system LOD
- make perspective view smaller
- make perspective view in “unlit mode” (alt+3)
  - or check “unlit movement” for static lit in view drop-down menu
- toggle off real time (ctrl+r)

navigation (right mouse button centered control)

	UDK game style	Maya view style
walk	LMB	?
rotate view	RMB	U+LMB
pan view	LMB+RMB	U+MMB
zoom view	LMB	U+RMB
view select	home

orthographic view
- LMB: pan view
- MMB scroll: zoom view

toggle view
- persp: alt+f
- top: alt+g
- front: alt+h
- side: alt+j
viewport hide and show configure
- toggle volume [bounding box] (o)
- toggle terrain (t)
- toggle static mesh [static dynamic] (w)
- game view [hide all] (g)