收到时，node.js生成标准输出字符串损坏

Question

我有以下python代码（script.py）：

import sys
import numpy as np
from scipy import stats

def generateBeta() :
    fit = (0.075252656968743836, 498.49505071718869, 9.9999999999999991e-05, 0.18136881492296397)
    rnd = stats.beta.rvs(fit[0], fit[1], fit[2], fit[3], 581)
    rndStr = ""
    for i in rnd:
            rndStr += str(i) + ','
    print rndStr[0:len(rndStr)-1]

if __name__ =='__main__' :
    generateBeta()

当运行“ python script.py”时，我得到如下信息：

0.000461650100253,0.000100731728317,0.000106550237062,0.000168159408577,0.000167330103757,0.000100050650386,0.000127253399976,0.000100193300275,0.000101258755861,0.000115222086572,0.00010000230276，....

一站式

当我以以下方式使用node.js child_process＃spawn调用它时：

var sys   = require('sys'),
    spawn = require('child_process').spawn,
    pyScript = spawn('python', ['./script.py']);
pyScript.stdout.setEncoding('utf8');
pyScript.stdout.on('data', function (data) {
  console.log(data);
});

数字被看起来像'\\ n'的东西打断，但不是。 流以某种方式被中断，即

0.000461650100253,0.000100731728317,0.000106550237062,0.000168159408577,0.000167330103757,0.000100050650386,0。 000127253399976,0.000100193300275,0.000101258755861,0.000115222086572,0.00010000230276，...

这导致在解释数据时出错（即，导致0.000127之后被解释为127 ..）

有谁知道为什么会发生这种干扰？

谢谢！！

爱丽儿

Answer 1

根据设计， console.log在其输出末尾写一个换行符。

您可能想改用process.stdout.write 。

http://nodejs.org/api/stdio.html#stdio_console_log_data http://nodejs.org/api/process.html#process_process_stdout

Answer 2

正如adpalumbo上面指出的那样，每个“块”都将调用事件数据。 通过连接数据并在发生“关闭”事件后采取措施来解决此问题：

var allData = "";
   pwScript.stdout.on('data', function (data) {
      allData = allData.concat(data);
   });

pyScript.on('close', function () {
  allData.split(',').forEach(function(d) { process.stdout.write(d + '\n')});
});

adpalumbo，感谢您指出这一点！