从 Python 子进程运行可执行文件时出错

Question

我正在尝试从 Python 3.5 运行可执行文件（线性规划求解器 CLP.exe）。

 Import subprocess

 exeFile = " C:\\MyPath\\CLP.exe"
 arg1 = "C:\\Temp\\LpModel.mps"
 arg2 = "-max"
 arg3 = " -dualSimplex"
 arg4 = " -printi all"
 arg5 = "-solution t solutionFile.txt"
 subprocess.check_output([exeFile, arg1, arg2, arg3, arg4, arg5],    stderr=subprocess.STDOUT, shell=False)

当我在 Eclipse PyDev 中运行 python 文件时，我可以在 Eclipse 控制台中看到结果。

但是，“solutionFile.txt”文件中没有保存任何求解结果。

在 Eclipse 控制台中，我得到：

  b'Coin LP version 1.16, build Dec 25 2015
  command line - C:\\MyPath\\clp.exe C:\\Temp\\LpModel.mps  -max     -dualSimplex  -printi all  -solution C:\\Temp\\solution.txt 

 At line 1 NAME          ClpDefau
 At line 2 ROWS
 At line 5 COLUMNS
 At line 8 RHS
 At line 10 BOUNDS
 At line 13 ENDATA
 Problem ClpDefau has 1 rows, 2 columns and 2 elements
 Model was imported from C:\\Temp\\LpModel.mps in 0.001 seconds
 No match for  -max - ? for list of commands
 No match for  -dualSimplex - ? for list of commands
 No match for  -printi all - ? for list of commands
 No match for  -solution C:\\Temp\\solution.txt - ? for list of commands
 Presolve 0 (-1) rows, 0 (-2) columns and 0 (-2) elements
 Empty problem - 0 rows, 0 columns and 0 elements
 Optimal - objective value 4
 After Postsolve, objective 4, infeasibilities - dual 0 (0), primal 0 (0)
 Optimal objective 4 - 0 iterations time 0.002, Presolve 0.00

当我从命令行在 MS windows shell 中运行命令时：

    C:\\MyPath\\clp.exe C:\\Temp\\LpModel.mps  -max  -dualSimplex  -printi all  -solution C:\\Temp\\solution.txt 

我可以在解决方案文件中得到结果。而且，如果我在命令行中运行该命令，粗线不会出现在输出中。

如果我从 Python subprocess 运行命令，为什么没有创建 solition.txt 文件并且没有保存解决方案结果？

Answer 1

每个空格分隔的标记都需要是 subprocess.check_output 数组中的另一个参数

exeFile = " C:\\MyPath\\CLP.exe"
subprocess.check_output([
    exeFile,
    "C:\\Temp\\LpModel.mps",
    "-max",
    "-dualSimplex",
    "-printi",
    "all",
    "-solution",
    "t",
    "solutionFile.txt"],
    stderr=subprocess.STDOUT,
    shell=False)