Python 我想创建一个时间序列的每月手段在熊猫

我有一个数据框架，由全年的每小时数据组成。我想计算月平均值，并在时间序列图中显示它们。我有一个变量，它是NO2值

#Cleaning data
ck_2000 = pd.read_csv('2000-CamdenKerbside.csv', header=0,skiprows=4,usecols=range(0,3),skipfooter = 1, na_values = 'No data',engine  = 'python')
colnames = ['Date', 'Time', 'NO2'] 
ck_2000.columns = colnames

#Reformat date/time
ck_2000.Time.replace(to_replace = '24:00:00', value = '00:00:00', inplace = True)
dtw = pd.to_datetime(ck_2000.Date + ck_2000.Time,format='%d/%m/%Y%H:%M:%S')
ck_2000.index = dtw

#Index dataframe by date
firstDate = ck_2000.index[0]
lastDate = ck_2000.index[len(ck_2000.Date) - 1]
ck2000 = ck_2000.reindex(index=pd.date_range(start = firstDate, end =lastDate, freq = '1H'), fill_value= None)

#Change data type to float
ck2000['NO2'] = ck2000['NO2'].dropna().astype('int64')

#Interpolation
ck_2000_int = ck_2000.interpolate()

#df's for all months
ck_2000_jan =  ck_2000_int['2000-01']
ck_2000_feb = ck_2000_int['2000-02']
ck_2000_mar = ck_2000_int['2000-03']
ck_2000_apr = ck_2000_int['2000-04']
ck_2000_may = ck_2000_int['2000-05']
ck_2000_jun = ck_2000_int['2000-06']
ck_2000_jul = ck_2000_int['2000-07']
ck_2000_aug = ck_2000_int['2000-08']
ck_2000_sept = ck_2000_int['2000-09']
ck_2000_oct = ck_2000_int['2000-10']  
ck_2000_nov = ck_2000_int['2000-11']
ck_2000_dec = ck_2000_int['2000-12']

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您应该能够使用

重采样


考虑下面的例子

tidx = pd.date_range('2000-01-01', '2000-12-31 23:00', freq='H')
ck_2000_int = pd.DataFrame(dict(NO2=np.random.randn(len(tidx))), tidx)

ck_2000_int.resample('M').mean().plot()

我收到以下错误-“未知日期时间字符串格式，无法解析：NO2”