只显示xaxis上的每个<n>日期（或按月份分组），以减少xaxis clu

Question

我目前正在学习一些Python，使用Jupyter笔记本和matplotlib库从JSON数据生成一些图形。我已经能够制作出很好的图表，但我不知道如何消除我的x轴混乱。请参见下面的屏幕截图。每天都有一个值，传入的数据中有数百天。这会产生一个非常混乱的x轴，无法读取。你知道吗

代码：

dates = [i['daily_sales_date'] for i in json_data]
values = [i['daily_sales'] for i in json_data]
print('sample date: ' + dates[0])
print('sample value: ' + str(values[0]))
df = pd.DataFrame({'dates':dates, 'values':values})
df['dates']  = [pd.to_datetime(i) for i in df['dates']]
plt.bar(dates, values)

结果：

那厚厚的黑条，是我所有的约会对象：）。我试过回顾一些假设不影响x轴日期的例子，但是我没有让它们起作用。我很乐意只显示沿轴的日期子集，甚至只显示月份名称。我所能做的就是让x轴标签根本不出现：/n有什么建议吗？你知道吗

根据其中一条建议，我尝试了以下几点：

from matplotlib.dates import MonthLocator
register_matplotlib_converters()

然后创建图形：

如你所见，我现在得到2019年（一年），但没有月？为清晰起见，以下提供了示例数据（根据要求）

[
    {
        "RowInsertDateTime": "2019-04-10T13:10:00.6",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 4994.2,
        "daily_sales_date": "2019-04-10T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-04-09T23:00:01.213",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 8868.75,
        "daily_sales_date": "2019-04-09T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-04-08T23:00:02.093",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 4618.55,
        "daily_sales_date": "2019-04-08T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-04-07T23:00:01.52",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 5710.01,
        "daily_sales_date": "2019-04-07T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-04-06T23:00:01.42",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9674.46,
        "daily_sales_date": "2019-04-06T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-04-05T23:50:01.977",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9243.66,
        "daily_sales_date": "2019-04-05T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-04-04T23:50:01.5",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 8865.75,
        "daily_sales_date": "2019-04-04T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-04-03T23:00:01.003",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 5530.14,
        "daily_sales_date": "2019-04-03T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-04-02T23:00:01.71",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 4893.77,
        "daily_sales_date": "2019-04-02T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-04-01T23:00:01.61",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 3741.6,
        "daily_sales_date": "2019-04-01T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-31T23:00:00.893",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 8727.52,
        "daily_sales_date": "2019-03-31T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-30T23:00:01.263",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9572.48,
        "daily_sales_date": "2019-03-30T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-29T23:50:01.937",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 20003.71,
        "daily_sales_date": "2019-03-29T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-28T23:50:00.933",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 29890.54,
        "daily_sales_date": "2019-03-28T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-27T23:00:01.267",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 19669.24,
        "daily_sales_date": "2019-03-27T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-26T23:00:13.68",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 18655.44,
        "daily_sales_date": "2019-03-26T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-25T23:00:12.427",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 4876.38,
        "daily_sales_date": "2019-03-25T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-24T23:00:16.313",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 8467.17,
        "daily_sales_date": "2019-03-24T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-23T23:00:23.517",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 12542.34,
        "daily_sales_date": "2019-03-23T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-22T23:50:14.363",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 12119.07,
        "daily_sales_date": "2019-03-22T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-21T23:50:12.527",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9403.31,
        "daily_sales_date": "2019-03-21T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-20T23:00:15.797",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 5872.87,
        "daily_sales_date": "2019-03-20T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-19T23:10:09.547",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 4634.91,
        "daily_sales_date": "2019-03-19T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-18T23:00:10.887",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 5789.16,
        "daily_sales_date": "2019-03-18T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-17T23:00:07.93",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9743.17,
        "daily_sales_date": "2019-03-17T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-16T23:00:12.367",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 10729.08,
        "daily_sales_date": "2019-03-16T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-15T23:50:09.177",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9404.83,
        "daily_sales_date": "2019-03-15T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-14T23:50:11.423",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9029.93,
        "daily_sales_date": "2019-03-14T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-13T23:00:17.653",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 4464.14,
        "daily_sales_date": "2019-03-13T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-12T23:00:14.063",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 4711.15,
        "daily_sales_date": "2019-03-12T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-11T23:00:11.227",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 7090.3,
        "daily_sales_date": "2019-03-11T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-10T23:00:07.127",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 8083.23,
        "daily_sales_date": "2019-03-10T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-09T23:10:10.253",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 10253.7,
        "daily_sales_date": "2019-03-09T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-08T23:50:09.863",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 12339.06,
        "daily_sales_date": "2019-03-08T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-07T23:50:10.497",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 10200.52,
        "daily_sales_date": "2019-03-07T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-06T23:10:10.87",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 6694.55,
        "daily_sales_date": "2019-03-06T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-05T23:10:08.707",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 5779.48,
        "daily_sales_date": "2019-03-05T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-04T23:00:09.39",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 4954.72,
        "daily_sales_date": "2019-03-04T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-03T23:00:10.75",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 8473.28,
        "daily_sales_date": "2019-03-03T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-02T23:00:09.637",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 11327.68,
        "daily_sales_date": "2019-03-02T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-03-01T23:50:11.49",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 11075.8,
        "daily_sales_date": "2019-03-01T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-02-28T23:50:10.217",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9143.1,
        "daily_sales_date": "2019-02-28T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-02-27T23:00:09.44",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 5523.66,
        "daily_sales_date": "2019-02-27T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-02-26T23:00:08.913",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 5235.5,
        "daily_sales_date": "2019-02-26T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-02-25T23:00:19.74",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 5379.84,
        "daily_sales_date": "2019-02-25T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-02-24T23:00:09.44",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 7194.78,
        "daily_sales_date": "2019-02-24T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-02-23T23:00:11.783",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9438.9,
        "daily_sales_date": "2019-02-23T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-02-22T23:50:07.167",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 9989.46,
        "daily_sales_date": "2019-02-22T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-02-21T23:50:06.98",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 10120.73,
        "daily_sales_date": "2019-02-21T00:00:00"
    },
    {
        "RowInsertDateTime": "2019-02-20T23:00:14.46",
        "ServerName": "P781S001",
        "StoreName": "PRICELINE WERRIBEE",
        "daily_sales": 5732.03,
        "daily_sales_date": "2019-02-20T00:00:00"
    }
]

Answer 1

使用记号定位器：

from matplotlib.dates import MonthLocator

ax.xaxis.set_major_locator(MonthLocator())

这将为每个月创建一个记号。有关更多定制选项，请参见docs。你知道吗