Question

我正在尝试建立一个模型来预测词典中定义的流量计时器的值。在MATLAB中已经完成并模拟了相同的问题，但是在访问字典中的元素时遇到了python中的错误。

import random
q_len = {'less': random.randrange(0,8), 'medium': random.randrange(6,14), 
'long':random.randrange(12,30)}
peak_hours = {'very_light':random.randrange(0, 7.5), 'heavy_ 
 morn':random.randrange(7,11.5), 'medium':random.randrange(11,16.5), 
'heavy_eve':random.randrange(16,20.5), 'light':random.randrange(20,24.5)}
time_ext = {'more_decrease':random.randrange(-32 -8), 
'decrease':random.randrange(-16 -1), 'do_not_change':random.randrange(-8 
-0.5), 'increase':random.randrange(0, 16), 
'more_increase':random.randrange(8, 32)}
def traffic(queue_len, peak_hours):
#entry1 = float(input('Enter the value of length of queue: '))
#entry2 = float(input('Enter the value of peak_hr: '))
#if entry1 in q_len && entry2 in peak_hours:
        for i in iter.items in q_len:
            for j in iter.items in peak_hours:
                if queue_len is less & peak_hours is very_light:
                    time_ext=more_decrease
                elif queue_len is less & peak_hours is heavy_morn:
                    time_ext=decrease
                elif queue_len is less & peak_hours is medium:
                    time_ext=decrease
                elif queue_len is less & peak_hours is heavy_eve :
                    time_ext=decrease
                elif queue_len is less & peak_hours is light:
                    time_ext=more_decrease
                elif queue_len is medium & peak_hours is very_light:
                    time_ext=increase
                elif queue_len is medium & peak_hours is heavy_morn:
                    time_ext=increase
                elif queue_len is medium & peak_hours is medium:
                    time_ext=do_not_change
                elif queue_len is medium & peak_hours is heavy_eve:
                    time_ext=increase
                elif queue_len is medium & peak_hours is light:
                    time_ext=do_not_change
                elif queue_len is long & peak_hours is very_light:
                    time_ext=do_not_change
                elif queue_len is long & peak_hours is heavy_morn:
                    time_ext=more_increase
                elif queue_len is long & peak_hours is medium:
                    time_ext=increase
                elif queue_len is long & peak_hours is heavy_eve:
                    time_ext=more_increase
                else:
                    time_ext=increase
print(time_ext)

从功能输入后，应打印时间扩展的值，但不打印相同的时间。如果有人知道我的错误，请提供帮助。

Answer 1

要访问字典，有两种方法：

q_len['less']
q_len.get('less','')。第二个参数是万一键'less'不存在时的默认值

Answer 2

您的错误是因为randrange仅接受整数（整数）值。关键是它从range中获取随机值，而random.randrange(0, 7.5)再次仅支持整数。因此，例如7.5无效，因为0不是整数（其中有一个小数）。如果您希望以7.5的步长从0.1到random.randrange(0, 75)/10随机数，则可以执行class UserAnimation : MoveAnimation { private double _defaultTranslationY; public UserAnimation() { DurationIn = DurationOut = 300; EasingIn = Easing.SinOut; EasingOut = Easing.SinIn; PositionIn = MoveAnimationOptions.Right; PositionOut = MoveAnimationOptions.Right; } //1 public override void Preparing(View content, PopupPage page) { base.Preparing(content, page); page.IsVisible = false; if (content == null) return; _defaultTranslationY = content.TranslationY; } //3 public override void Disposing(View content, PopupPage page) { base.Disposing(content, page); page.IsVisible = true; if (content == null) return; content.TranslationY = _defaultTranslationY; } //2 public async override Task Appearing(View content, PopupPage page) { var taskList = new List<Task>(); taskList.Add(base.Appearing(content, page)); if (content != null) { var topOffset = GetTopOffset(content, page); var leftOffset = GetLeftOffset(content, page); taskList.Add(content.TranslateTo(content.Width, _defaultTranslationY, DurationIn, EasingIn)); }; page.IsVisible = true; await Task.WhenAll(taskList); } //4 public async override Task Disappearing(View content, PopupPage page) { var taskList = new List<Task>(); taskList.Add(base.Disappearing(content, page)); if (content != null) { _defaultTranslationY = content.TranslationX - content.Width; var topOffset = GetTopOffset(content, page); var leftOffset = GetLeftOffset(content, page); taskList.Add(content.TranslateTo(leftOffset, _defaultTranslationY, DurationOut, EasingOut)); }; await Task.WhenAll(taskList); } }。

如何在循环中访问字典的元素？

2 个答案: