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我正在开发一个 Ubuntu Appindicator，它每 X 秒显示一次 JSON API 调用的值。

问题是，它会随机停止调用self.loop而不会出现任何错误或警告。我可以让它运行几天或几个小时。我已经设置（开发中）调试语句，并且在loop调用函数后它总是停止运行。

就好像我是False从函数返回还是不返回，尽管这段代码中的逻辑应该总是 return True。

这是（适用于 GTK2 但原则不变）的文档。GObject.timeout_add

我不确定它是否依赖于 PyGTK 版本。我在 Ubuntu 16.04 和 Ubuntu 17.04 中遇到过这种情况。

这是完整的课程。调用 JSON API 的位置在result = self.currency.query(). 我很乐意提供进一步的反馈。

import gi

gi.require_version('Gtk', '3.0')
from gi.repository import GObject


class QueryLoop():
    """QueryLoop accepts the indicator to which the result will be written and an currency to obtain the results from.
    To define an currency you only need to implement the query method and return the results in a pre-determined
    format so that it will be consistent."""
    def __init__(self, indicator, currency, timeout=5000):
        """
        Initialize the query loop with the indicator and the currency to get the data from.
        :param indicator: An instance of an indicator
        :param currency: An instance of an currency to get the information from
        :param timeout The interval between requests to the currency API
        """
        self.indicator = indicator
        self.currency = currency
        self.timeout = timeout
        self.last_known = {"last": "0.00"}

    def loop(self):
        """Loop calls it-self forever and ever and will consult the currency for the most current value and update
        the indicator's label content."""
        result = self.currency.query()

        if result is not None:
            self.indicator.set_label("{} {}".format(result["last"], self.currency.get_ticker()))
            self.last_known = result
        else:
            self.indicator.set_label("Last Known: {} EUR (Error)".format(self.last_known["last"]))

        return True

    def start(self):
        """Starts the query loop it does not do anything else. It's merely a matter of naming because
        when initializing the loop in the main() point of entry."""
        GObject.timeout_add(self.timeout, self.loop)
        self.loop()
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