用Python函数构建字典

Question

大家好~~：）我有一个Arduino Uno通过USB将传感器数据发送到PyCharm（Python IDE），之后我必须编译这些数据并写入CSV文件，以便稍后进行机器学习。你知道吗

我正在尝试用Python构建一个字典，作为一个函数，如下所示：

def readData():  # reads inputs from Arduino
   try:
     datastring = arduino.readline()
   except:
     pass
 return datastring

def build_dictionary(): # function to build dictionary
     incomingdata = readData()

    for incomingdata in arduino:
      incomingdata = incomingdata.strip()

    if incomingdata:
        datasplit = incomingdata.split(',')
        i = 0
        temperature = datasplit[i]
        i = i + 1
        humidity = datasplit[i]
        i = i + 1
        light = datasplit[i]
        i = 0
        dic = {'Temp': temperature, 'Humidity': humidity, 'Light': light}

当我把字典的某些部分打印出来时，“dic”，紧跟在“dic={…}之后，如：

print "dic['Temp']: ", dic['Temp']

我能够正常地获得输出（即PyCharm打印了Arduino发送给它的所有内容）。然而，当我做了以下事情：

def build_dictionary(): # function to build dictionary
     incomingdata = readData()

    for incomingdata in arduino:
      incomingdata = incomingdata.strip()

    if incomingdata:
        datasplit = incomingdata.split(',')
        i = 0
        temperature = datasplit[i]
        i = i + 1
        humidity = datasplit[i]
        i = i + 1
        light = datasplit[i]
        i = 0
        global dic
        dic = {'Temp': temperature, 'Humidity': humidity, 'Light': light}
   return dic

while True:
    print "dic['Temp']: ", dic['Temp']

结果是：

dic['Temp']:  24.00 
dic['Temp']:  25.00

只有前两个输出奇怪地打印出来。对Arduino板的检查显示，它仍在向PyCharm（Python）发送信息，但它们只是没有被打印出来。你知道吗

我能问一下我哪里出错了吗？你知道吗

非常感谢！：）

Answer 1

听起来您需要从串行端口读取一行，然后处理该行，然后返回并获取新行，依此类推：

def readData(): # read just one line from arduino
    # simplified
    return arduino.readline()

def build_dictionary(incomingdata): # function to build dictionary
    dic = {}
    incomingdata = incomingdata.strip()
    if incomingdata:
        datasplit = incomingdata.split(',')
        temperature = datasplit[0]
        humidity = datasplit[1]
        light = datasplit[2]
        dic = {'Temp': temperature, 'Humidity': humidity, 'Light': light}
   return dic

while True:
    dic = build_dictionary(readData())
    print(dic)

注意：

这个代码永远循环。它无法停止（除非按ctrl-C）

更新：

使用计数器在多个样本后中断：

for _ in range(9999):
    dic = build_dictionary(readData())
    print(dic)