Python包安装——mayavi安装

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安装mayavi有两种方法：

一种是安装集成了多个python包的软件，如 Enthought Canopy, Pythonxy, orAnaconda.但是貌似几个集成环境中都没有看到mayavi的影子。

第二种就是从源代码开始安装：安装mayavi之前先要安装这几个依赖包

You must have the following libraries installed before installing the Mayavi project:

• Numpy version 1.1.1 or later
• VTK version 5.0 or later
• wxPython version 2.8 or later
• configobj

那么先开始安装vtk吧。两种方法：

一：

首先安装vtk：

安装VTK，从网站http://www.vtk.org/VTK/resources/software.html 下载最新版本，此文安装的是：vtkpython-6.1.0-Windows-64bit.exe

3）配置VTK环境变量：

A：把VTK中的bin文件加入系统变量中：如：PATH：C:\Program Files\VTK 6.1.0\bin

B：设置python路径，在系统变量中创建PYTHONPATH ：如：PYTHONPATH ：C:\Program Files\VTK 6.1.0\bin;C:\Program Files\VTK 6.1.0\bin\Lib\site-packages

4）测试，打开python IDEL界面，输入：import vtk

>>> import vtk
>>> 

没报错，就说明安装成功了。

我是直接把site-packages里面的vtk拷贝到了python27下面的site-packages中

安装VTK的第二种方法，从源代码开始安装（需要先编译VTK，由于是win10系统没成功）

好吧，装了了vtk之后再到mayavi-4.4.3文件夹下运行python setup.py install 还是不成功。

于是又老老实实看了Enthought Canopy发现vtk，tvtk还有traits啥的还是有的，尽管就是没有mayavi，先装个Canopy，然后把把site-packages里面的vtk拷贝到了python27下面的site-packages中

我擦，不科学，怎么会这样

特么竟然有了，有了！！！！！！直接考到python27下面的site-packages中

import mayavi.mlab as mlab

遇到ValueError: cannot set toolkit to wx because it has already been set to qt4的问题

从这个网址看到的解决方案

Hi, 

Building traitsui GUIs from the ipython notebook should work the same as from a regular ipython console. The difference between configure_traits and edit_traits is that the first one creates a GUI event loop before building the traitsUI window in it. That's what makes it responsive or not. Alternatively you can manually start the GUI event loop by specifying --gui=?? when you create ipython, for example:
ipython notebook --gui=wx
Then you should use edit_traits() and the UI element will be responsive. 

Finally, ETSConfig allows you to set the backend at your script runtime instead of when you start python/ipython. This is what I do the most so that I don't need to set the value of the ETSConfig environment variable, or set the gui switch when starting python/ipython.

To conclude, the following code is what I do the most and works from within the ipython notebook started with ipython notebook (version 0.13):
from traits.etsconfig.api import ETSConfig
ETSConfig.toolkit = 'qt4'

from traits.api import HasTraits, Enum
from traitsui.api import View

class A(HasTraits):
    x = Enum(["foo","bar"])

a = A()
a.configure_traits()

HTH, 
Jonathan

Thanks, Jonathan.

I would like to follow your advice, but am getting some errors. When I try this at the top of a new notebook, I get:

from traits.api import *

from traits.etsconfig.api import ETSConfig

from traitsui.api import *

ETSConfig.toolkit = 'qt4'

---------------------------------------------------------------------------ValueError                                Traceback (most recent call last)<ipython-input-2-8a5daaa83ef1> in <module>()----> 1 ETSConfig.toolkit = 'qt4'/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/traits/etsconfig/etsconfig.py in _set_toolkit(self, toolkit)    208         if self._toolkit and self._toolkit != toolkit:    209             raise ValueError, "cannot set toolkit to %s because it has "\--> 210                             "already been set to %s" % (toolkit, self._toolkit)    211     212         self._toolkit = toolkitValueError: cannot set toolkit to qt4 because it has already been set to wx

Any idea what might be causing this? I suspect the other error below on starting ipython-qtconsole may be related, but am equally clueless about this. I think both these worked until recently. 

Ah, Google to the rescue

https://mail.enthought.com/pipermail/enthought-dev/2009-August/023406.html

I must put ETSConfig.toolkit = 'qt4' before any other ETS import, or the earlier import will set default to wx. 

The corresponding ipython-qtconsole error happened because I still had an ipython notebook server open in which the same error had already happened, seems OK now.

Why one uses 2.6 and the other 2.7 I don't even need to know, as long as it works :-)

All set now, thank you!

================================================================================================================================

下面是一个例子

importnumpyasnp

importmayavi.mlabasmlab

import  moviepy.editorasmpy

 

duration=2# duration of the animation in seconds (it will loop)

 

# MAKE A FIGURE WITH MAYAVI

 

fig=mlab.figure(size=(500,500),bgcolor=(1,1,1))

 

u=np.linspace(0,2*np.pi,100)

xx,yy,zz=np.cos(u),np.sin(3*u),np.sin(u)# Points

l=mlab.plot3d(xx,yy,zz,representation="wireframe",tube_sides=5,

                line_width=.5,tube_radius=0.2,figure=fig)

 

# ANIMATE THE FIGURE WITH MOVIEPY, WRITE AN ANIMATED GIF

 

defmake_frame(t):

    """ Generates and returns the frame for time t. """

    y=np.sin(3*u)*(0.2+0.5*np.cos(2*np.pi*t/duration))

    l.mlab_source.set(y=y)# change y-coordinates of the mesh

    mlab.view(azimuth=360*t/duration,distance=9)# camera angle

    returnmlab.screenshot(antialiased=True)# return a RGB image

 

animation=mpy.VideoClip(make_frame,duration=duration).resize(0.5)

# Video generation takes 10 seconds, GIF generation takes 25s

animation.write_videofile("wireframe.mp4",fps=20)

animation.write_gif("wireframe.gif",fps=20)

运行这个例子提醒没有安装“ffmpeg.win32.exe”

从https://github.com/imageio/imageio-binaries/blob/master/ffmpeg/ffmpeg.win32.exe下载了个“ffmpeg.win32.exe”文件。

然后在用户和系统环境变量里面新建一个名字叫“IMAGEIO_FFMPEG_EXE”，值是你存放这个exe文件的地址的变量。