Question

我想知道是否有一种优雅的方法来查看是否可以检查while循环中连续变化的值，如果值停止变化并保持不变，则停止while循环。

例如：

Value = 0
while True:
    value changes everytime
    (if value still the same break)

Answer 1

这样怎么样？顺便说一句：修复你的拼写错误setValueOfElement = function (element, value, attempts) { if (attempts == null) { attempts = 10; } return element.sendKeys(value).then(function (found) { }, function (err) { if (attempts > 0) { browser.sleep(100); return exports.setValueOfElement(element, attempts - 1); } else { throw err; } }); };在python中不是while。

While

Answer 2

 <ul class="nav navbar-nav">
    <?php foreach ($categories as $category) { ?>
    <?php if ($category['children']) { ?>
    <li class="dropdown"><a href="<?php echo $category['href']; ?>" class="dropdown-toggle" data-toggle="dropdown"><?php echo $category['name']; ?></a>
      <div class="dropdown-menu">
        <div class="dropdown-inner">
          <?php foreach (array_chunk($category['children'], ceil(count($category['children']) / $category['column'])) as $children) { ?>
          <ul class="list-unstyled">
            <?php foreach ($children as $child) { ?>
            <li><a href="<?php echo $child['href']; ?>"><?php echo $child['name']; ?></a></li>
            <?php } ?>
          </ul>
          <?php } ?>
        </div>
        <a href="<?php echo $category['href']; ?>" class="see-all"><?php echo $text_all; ?> <?php echo $category['name']; ?></a> </div>
    </li>
    <?php } else { ?>
    <li><a href="<?php echo $category['href']; ?>"><?php echo $category['name']; ?></a></li>
    <?php } ?>
    <?php } ?>
  </ul>

Answer 3

你可以：

value_old = 0
value_new = 1
value = [value_old, value_new]
while True:
    # change

    # test
    if value[0] == value[1]:
        break
    else:
        value = [value[1], value[0]]

Answer 4

更可移植的解决方案是将其设为一个类，以便实例保留先前的值。我也需要模糊匹配，因此我将其包含在以下示例中。

class SamenessObserver:
    """An object for watching a series of values to see if they stay the same.
    If a fuzy match is required maxDeviation may be set to some tolerance.

    >>> myobserver = SamenessObserver(10)
    >>> myobserver.check(9)
    False
    >>> myobserver.check(9)
    True
    >>> myobserver.check(9)
    True
    >>> myobserver.check(10)
    False
    >>> myobserver.check(10)
    True
    >>> myobserver.check(11)
    False
    >>> myobserver = SamenessObserver(10, 1)
    >>> myobserver.check(11)
    True
    >>> myobserver.check(11)
    True
    >>> myobserver.check(10)
    True
    >>> myobserver.check(12)
    False
    >>> myobserver.check(11)
    True
    >>> 

    """

    def __init__(self, initialValue, maxDeviation=0):
        self.current = 0
        self.previous = initialValue
        self.maxDeviation = maxDeviation

    def check(self, value):
        self.current = value
        sameness = (self.previous - self.maxDeviation) <= self.current <= (self.previous + self.maxDeviation)
        self.previous = self.current
        return sameness

检查While循环Python中的值是否仍然相同

4 个答案: