golang调⽤python3，并使⽤python模块中的⽅法
python代码转换因项⽬需要，很多代码和python模块是go语⾔没有的，虽然有个项⽬是转化python代码到golang代码，但是还没开始⽤，关键是python 引⽤的模块如此之多，不可能都去转换对吧。
py3安装⽅法
*************************************
1.先安装chocolatey
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0.11.3
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PS C:\Users\Administrator>
2.下载github/christian-korneck/snack
3.执⾏build.bat⽂件，⾃动安装python和设置pkg-config
4.修改go.mod中的go 1.17版本为你当前安装的版本号，⽐如go 1.16
5.然后go mod tidy更新mod⽂件
6.进⼊⽂件夹内执⾏go 编译⽣成exe⽂件，将C:\dist\python3
7.dll拷贝到exe⽂件所在⽂件夹内才能运⾏
7.刚才那个bat⽂件没有安装pip，所以要在PowerShell⾥安装pip
$ curl bootstrap.pypa.io/get-pip.py -o get-pip.py # 下载安装脚本
注意：⽤哪个版本的 Python 运⾏安装脚本，pip 就被关联到哪个版本，如果是 Python3 则执⾏以下命令：
Win下：python get-pip.py
PS C:\Users\Administrator> pip -V
pip 21.3.1 from c:\py\lib\site-packages\pip (python 3.7)
8.开始安装依赖包：设置国内代理，否则超级慢
Collecting ansys-mapdl-reader
Using cached ansys_mapdl_reader-0.51.7-cp37-cp37m-win_amd64.whl (1.1 MB)
Collecting matplotlib>=3.0.0
Using cached matplotlib-3.5.1-cp37-cp37m-win_amd64.whl (7.2 MB)
Collecting tqdm>=4.45.0
Using cached tqdm-4.62.3-py2.py3-none-any.whl (76 kB)
Collecting appdirs>=1.4.0
Using cached appdirs-1.4.4-py2.py3-none-any.whl (9.6 kB)
<-py3例⼦
调⽤python模块中的⽅法
⽐如，⼀个python的代码如下
# plot.py
import os,sys
import ader as aaa
#import pyvista as pv
# from ansys.mapdl import reader as pymapdl_reader
# from ader import examples
# import ansys.mapdl
# import ader
#import pyansys
#dir_path = os.path.dirname(alpath(__file__)) #⽬录路径
#print(dir_path)
#rstfile = os.path.join(dir_path, '1641543541831483300_0.rst') #本地rst⽂件
>###⽹上例⼦>>>>>>>>>>>>####
# def read_ansys():
# dir_path = os.path.dirname(alpath(__file__)) #⽬录路径
# print(dir_path)
# rstfile = os.path.join(dir_path, '2.rst') #本地rst⽂件
# rstfile = examples.rstfile #⽹上例⼦
# result = ad_binary('2.rst') #新版读⽂件
# freqs = result.time_values
# print(freqs)
# nnum, disp = dal_solution(0)
# print(disp)
# cpos = result.plot_nodal_solution(0) #显⽰到窗⼝
# vtkfile = os.path.join('', 'hexrst1.vtk')
# result.save_as_vtk('hexrst1.vtk')
>>>>>>>>>>>>>>>####
# if __name__ == '__main__':
# it(read_ansys())
在python中，上述代码⽤aaa包中的read_binary⽅法来读取⼀个⽂件夹⾥的⽂件对吧。到go⾥怎么做呢？
package main
import (
"fmt"
"github/DataDog/go-python3"
"log"
"os"
)
func init() {
// 1. 初始化python环境
python3.Py_Initialize()
if !python3.Py_IsInitialized() {
fmt.Println("Error initializing the python interpreter")
os.Exit(1)
}
}
func main() {
// 2. 设置本地python import 的路径
// p := "C:/py/Lib/site-packages"
// InsertBeforeSysPath(p)
// 3. 导⼊hello模块
plot := ImportModule("D:/snack/ansys", "plot") //导⼊python代码plot.py
qin := plot.GetAttrString("aaa") //获取函数-plot.py⾥的导⼊包import ader as aaa
log.Print(qin)
sep := python3.PyUnicode_FromString("2.rst") //必须是ansys14+⽣成的rst⽂件！！
res2 := qin.CallMethodArgs("read_binary", sep)
log.Print(res2)
sep0 := python3.PyLong_FromGoInt(0)
cpos := res2.CallMethodArgs("plot_nodal_solution", sep0) //显⽰到窗⼝
log.Print(cpos)
sep2 := python3.PyUnicode_FromString("hexrst3.vtk")
res3 := res2.CallMethodArgs("save_as_vtk", sep2)
log.Print(res3)
注意到没有，是先导⼊这个代码⽂件plot.py，然后再获取py代码⾥引⼊的模块aaa，开始使⽤aaa⾥的read_binary⽅法，⽤callmethodargs，⽅法名称写在括号⾥，参数写在⽅法名称后⾯。代码有点乱，看仔细点就清楚了。好了，就是下⾯这个效果⽽已。
这个3d图可是可以转动的哦，vtk真是厉害。
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