小编Eri*_*uza的帖子

假设iPhone放在一张平台上.我想确定桌面的角度,其中0的角度意味着桌子与重力矢量完全垂直.我使用以下公式:

    radians = atanf (z / sqrt (x^2 + y^2)

在.h

double      accelerationXAverage;
double      accelerationYAverage;
double      accelerationZAverage;

double      accelerationXSum;
double      accelerationYSum;
double      accelerationZSum;
int         readingsCount;

在他们中

#define kThresholdMovementHigh 0.05

- (void)accelerometer:(UIAccelerometer *)accelerometer
        didAccelerate:(UIAcceleration *)acceleration 
{
    // did device move a lot? if so, reset sums
    if (fabsf(acceleration.x - accelerationXAverage) > kThresholdMovementHigh ||
        fabsf(acceleration.y - accelerationYAverage) > kThresholdMovementHigh ||
        fabsf(acceleration.z - accelerationZAverage) > kThresholdMovementHigh   )
    {
        NSLog(@"deviceDidMove a lot");
        accelerationXSum = acceleration.x;
        accelerationYSum = acceleration.y;
        accelerationZSum = acceleration.z;
        readingsCount = 1; …

使用Alexa 中的新实体解析，嵌套字典变得非常嵌套。引用深度嵌套值的最pythonic 方式是什么？我如何编写每行不超过 79 个字符的代码？

这是我目前拥有的，虽然它有效，但我很确定有更好的方法：

if 'VolumeQuantity' in intent['slots']:
    if 'resolutions' in intent['slots']['VolumeQuantity']:
        half_decibels = intent['slots']['VolumeQuantity']['resolutions']['resolutionsPerAuthority'][0]['values'][0]['value']['name'].strip()
    elif 'value' in intent['slots']['VolumeQuantity']:
        half_decibels = intent['slots']['VolumeQuantity']['value'].strip()

这是来自 alexa 的 json 的部分示例

  {
    "type": "IntentRequest",
    "requestId": "amzn1.echo-api.request.9a...11",
    "timestamp": "2018-03-28T20:37:21Z",
    "locale": "en-US",
    "intent": {
      "name": "RelativeVolumeIntent",
      "confirmationStatus": "NONE",
      "slots": {
        "VolumeQuantity": {
          "name": "VolumeQuantity",
          "confirmationStatus": "NONE"
        },
        "VolumeDirection": {
          "name": "VolumeDirection",
          "value": "softer",
          "resolutions": {
            "resolutionsPerAuthority": [
              {
                "authority": "amzn1.er-authority.echo-blah-blah-blah",
                "status": {
                  "code": "ER_SUCCESS_MATCH"
                },
                "values": [
                  {
                    "value": {
                      "name": "down", …