小编Jul*_*Das的帖子

在Python中,我想编写一个make_cylinder_volume(r)返回另一个函数的函数.返回的函数应该可以使用参数调用h,并返回具有高度h和半径的圆柱体积r.

我知道如何从Python中的函数返回值,但是如何返回另一个函数？

我试图从连接到我的Arduino MEGA的SD卡上逐行读取文本文件"Print1.txt".到目前为止,我有以下代码:

#include <SD.h>
#include <SPI.h>
int linenumber = 0;
const int buffer_size = 54;
int bufferposition;
File printFile;
char character;
char Buffer[buffer_size];
boolean SDfound;


void setup()
{
  Serial.begin(9600);
  bufferposition = 0;
}

void loop() 
{
  if (SDfound == 0)
  {
    if (!SD.begin(53)) 
    {
      Serial.print("The SD card cannot be found");
      while(1);
    }
  }
  SDfound = 1;
  printFile = SD.open("Part1.txt");


  if (!printFile)
  {
    Serial.print("The text file cannot be opened");
    while(1);
  }

  while (printFile.available() > 0)
  {
    character = printFile.read();
    if (bufferposition …

此代码设置为读取两列数据,然后将第一列打印到第一个numpy数组中,然后将第二列打印到第二个numpy数组中.

def read2coldata(filename):

    import numpy
    b = []
    f = open(filename,"r")
    lines = f.readlines()
    f.close()
    for line in lines:
        a = line.split()
        for i in a:
            b.append(i)
    return (numpy.array(b[::2]),numpy.array(b[1::2]))

但是这给出了:

(array(['1.5', '8', '16', '17'], dtype='|S3'), array(['4', '5', '6', '6.2'], dtype='|S3'))

如何摆脱dtype="|S3"零件只是离开:

(array(["1.5","8","16","17"], array(["4","5","6","6.2"])