Question

我最近一直在使用字典，我一直致力于一个项目，其中包括将一天的活动保存到日历中。

因此密钥的格式为日期格式yyyy-mm-dd。我希望这样做，以便字典中的每个“键”都可以根据日期而出现。例如：关键的2015-11-10以及当天的活动和2015-11-9的活动，我希望2015-11-9及其活动首先打印出来。我已经尝试过排序和元组等。但是这只会对密钥内部的内容进行排序而不是密钥本身。有什么想法或建议吗？

>>> calendar = {}
    >>> command_add("2015-10-12", "Eye doctor", calendar)
    ''
    >>> command_add("2015-10-12", "lunch with sid", calendar)
    ''
    >>> command_add("2015-10-29", "Change oil in blue car", calendar)
    ''
    >>> command_add("2015-10-12", "dinner with Jane", calendar)
    ''
    >>> command_add("2015-10-29", "Fix tree near front walkway", calendar)
    ''
    >>> command_add("2015-10-29", "Get salad stuff", calendar)
    ''
    >>> command_add("2015-11-06", "Sid's birthday", calendar)
    ''
    >>> command_show(calendar)

我需要的是：

>>> command_show(calendar)
        2015-10-12:
            0: Eye doctor
            1: lunch with sid
            2: dinner with Jane
        2015-10-29:
            0: Change oil in blue car
            1: Fix tree near front walkway
            2: Get salad stuff
        2015-11-06:
            0: Sid's birthday
    ''

Answer 1

正常dictionaries是无序的。如果您需要有序字典，则必须使用OrderedDict。

但我想以有序的方式迭代值就足够了。通常，你这样做：

for key, value in sorted(mydict.items()):
    pass  # now it is sorted in ascending order of key

请注意，mydict仍然无序。 .items()返回(key, value)元组列表。列表可以排序。

dict with list elements

#!/usr/bin/env python


def command_add(day, event_name, calendar):
    if day in calendar:
        calendar[day].append(event_name)
    else:
        calendar[day] = [event_name]


def command_show(calendar):
    """
    Parameters
    ----------
    calendar : dict
        The keys are dates in the format YYYY-MM-DD and the values are lists
        of events
    """
    for day, events in sorted(calendar.items()):
        print("%s:" % day)
        for i, event in enumerate(events):
            print("\t%i: %s" % (i, event))


calendar = {}
command_add("2015-10-12", "Eye doctor", calendar)
command_add("2015-10-12", "lunch with sid", calendar)
command_add("2015-10-29", "Change oil in blue car", calendar)
command_add("2015-10-12", "dinner with Jane", calendar)
command_add("2015-10-29", "Fix tree near front walkway", calendar)
command_add("2015-10-29", "Get salad stuff", calendar)
command_add("2015-11-06", "Sid's birthday", calendar)
command_show(calendar)

如何按递增顺序重新排列字典键（例如：一年中的日期作为键）？蟒蛇3

1 个答案:

dict with list elements