Python如何处理时间转换？

Question

Recently I have been working on a time series data set and have written a script to automate some plotting. Using the pd.to_datetime function (provided with a specific format), I assumed would automatically convert every time entry to the appropriate format.

The raw data follows this format:
%d/%m/%YYYY HH:MM (HH:MM is irrelevant in this case so don't worry about it as we are only interested in the daily average)

However, it seems Python intermittently changes the 'raw timestamps' and changes the format to: %d-%m-%YYYY

Why is this the case and how can I make sure Python doesn't do this?

I have received the below error and struggle to work out why this is the case. I have looked at the following SO but I don't have the same issue. time data does not match format

The data itself is provided in the following CSV and is all in the %d/%m/%Y format.

My code for my function is attached in case there are any errors with how I've converted the timestamps.

def plotFunction(dataframe):
    for i in wellNames:
        my_list = dataframe["Date"].values
        DatesRev = []

        for j in my_list:
            a=j[0:10]
            DatesRev.append(a)
        #We now need to re-add the dates to our data frame
        df2 = pd.DataFrame(data= DatesRev)
        df2.columns = ["DatesRev"]
        dataframe["DatesRev"] = df2["DatesRev"]
#         print (dataframe)
#         #df2= pd.DataFrame(DatesRev) 
#         #df2.columns = ['DatesRev']    
#         #dataframe['DatesRev'] = df2['DatesRev']
        wellID = dataframe[dataframe['Well']==i]
        wellID['DatesRev'] = pd.to_datetime(wellID['DatesRev'], format='%d/%m/%Y')
        print (i)
#         ax = wellID.set_index('DatesRev').plot()
#         xfmt = mdates.DateFormatter('%d-%m-%Y')
#         ax.xaxis.set_major_formatter(xfmt)
#         plt.xticks(rotation=90)
#         ax.legend(bbox_to_anchor=(1.04,1), loc="upper left")
#         plt.title(i)
#         plt.show()
#         plt.savefig(i + ".jpg", bbox_inches='tight') 

Answer 1

The problem is that python does not recognize / very well. I came across this problem myself. Dashes are what it recognizes the best. If I may suggest, try to keep the - formatting. It is just Python being Python. :P

In wellID['DatesRev'] , change format='%d/%m/%Y' to format='%d-%m-%Y' and that should possibly fix your problem.