Question

我花了30多个小时试图解决这个问题，包括在网上搜索。现在我正在接触。

我的环境：Python 3.6.0，pandas 0.20.1，matplotlib 2.0.2，pypyodbc 1.3.4

我正在尝试从SQL Server中绘制数据。除最终绘图外，代码中的所有内容都不起作用，不显示x轴刻度线或任何x轴值。否则，情节看起来是正确的。 x轴是日期字段，格式为YYYY-mm-dd。我已经尝试了几十种变体来使它工作。你看到这段代码有什么问题吗？不介意复杂的查询，我真的不认为这与问题有关。

import pypyodbc
import pandas as pd
import pandas.io.sql
import matplotlib.pyplot as plt
import matplotlib.dates as mdates
from matplotlib.ticker import FormatStrFormatter

months = mdates.MonthLocator()  # every month
days = mdates.DayLocator()  # every day
daysFmt = FormatStrFormatter('%d')


#Connect to SQL Server databause using Trusted Connection

sql = """SELECT UID, startdate, lastdelivered FROM TABLENAME """
iddf = pandas.io.sql.read_sql(sql, conn)

for UID in range(len(iddf)):
    sql = """SELECT impdate, sum(imp) as imps FROM TABLENAME where UID = """ 
+ str(iddf['UID'].iloc[UID]) + """ and impdate >= '2017-05-01' and impdate 
<= '2017-05-15' group by impdate order by impdate"""
    df = pandas.io.sql.read_sql(sql, conn)
    df.impressions.fillna(value=0, inplace=True)

    pd.to_datetime(df['impdate'], format= '%Y-%m-%d')
    print (df['impdate']) #Shows the format to be YYYY-mm-dd


    ax = (df[['impdate','imps']].plot(kind='line', title="UID: ", figsize=
(10, 10), legend=False, fontsize=10))

    ax.set_xlabel("ImpDate", fontsize=12)
    ax.set_ylabel("Imps", fontsize=12)

    ax.xaxis.set_major_locator(days)
    ax.xaxis.set_major_formatter(daysFmt)

    plt.setp(ax.get_xticklabels(),visible = True) 
    plt.show(ax)
    plt.close('all')

Matplotlib - 显示x轴值 - 日期

0 个答案: