从模块 class 存储和读取数据

Question

我正在尝试使用一个模块从传感器板上读取数据，将该数据放入 class，然后在另一个模块中打印该数据。我不确定我是否遵循了这里的最佳实践，或者是否有更好的方法来做到这一点。目前我收到以下错误，我不确定如何更正。

Traceback (most recent call last):
  File "app/conductor.py", line 15, in <module>
    accel_x, accel_y, accel_z = nineDOF.Acceleration()
TypeError: cannot unpack non-iterable NoneType object

conductor.py:

import time
import datetime
import dht11
import max31865
import lsm9ds1

while True:
    externalReading = max31865.temp()
    print("External Temp: {0:0.3f}C".format(externalReading))

    internalTemp, internalHumidity = dht11.readings()
    print("Internal Temp 1: {:.3f}C  Humidity: {}% ".format(internalTemp, internalHumidity))

    nineDOF = lsm9ds1.get()
    accel_x, accel_y, accel_z = nineDOF.Acceleration()
    mag_x, mag_y, mag_z = nineDOF.Magnetometer()
    gyro_x, gyro_y, gyro_z = nineDOF.Gyroscope()
    internalTemp2 = nineDOF.temperature()
    print(
        "Acceleration (m/s^2): ({0:0.3f},{1:0.3f},{2:0.3f})".format(
            accel_x, accel_y, accel_z
        )
    )
    print(
        "Magnetometer (gauss): ({0:0.3f},{1:0.3f},{2:0.3f})".format(mag_x, mag_y, mag_z)
    )
    print(
        "Gyroscope (degrees/sec): ({0:0.3f},{1:0.3f},{2:0.3f})".format(
            gyro_x, gyro_y, gyro_z
        )
    )
    print("Internal Temp 2: {0:0.3f}C".format(internalTemp2))

lsm9ds1.py:

import board
import busio
import adafruit_lsm9ds1

# SPI connection:
from digitalio import DigitalInOut, Direction

spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
csag = DigitalInOut(board.D5)
csag.direction = Direction.OUTPUT
csag.value = True
csm = DigitalInOut(board.D6)
csm.direction = Direction.OUTPUT
csm.value = True
sensor = adafruit_lsm9ds1.LSM9DS1_SPI(spi, csag, csm)


class Readings:
    def __init__(self):
        pass

    def Acceleration(self):
        x, y, z = sensor.acceleration

    def Magnetometer(self):
        x, y, z = sensor.magnetic

    def Gyroscope(self):
        x, y, z = sensor.gyro

    def temperature(self):
        x = sensor.temperature


def get():
    return Readings()

Answer 1

您的直接问题是 Readings class 中的方法没有 return 值，而 Python 的默认 return 值没有显式 return 语句是None。有一些语言的函数中的最后一个值也是 return 值 - 想到 R、Perl 和 Bourne Shell - 这可能是这里混淆的根源。 return, return None, and no return at all?

中对此进行了讨论

来自 Acceleration 方法的隐式 None return 值无法解压缩为三元素元组。如果您在该方法的末尾添加一个 return x, y, z，它应该可以工作。

就class和程序结构而言，这取决于您的目标。

从模块 class 存储和读取数据

Storing and reading data from module class

class

python-3.x

adafruit-circuitpython

conductor.py:

lsm9ds1.py: