python - ValueError: time data u'Date' does not match format '%Y-%m-%d' -


i'm new python programming. looked solution error couldn't find any. i've been trying figure out what's wrong hours no luck. here's code:

    import matplotlib.pyplot plt     import numpy np     import urllib     import matplotlib.dates mdates      def bytespdate2num(fmt, encoding='utf-8'):         strconverter = mdates.strpdate2num(fmt)         def bytesconverter(b):             s = b.decode(encoding)             return strconverter(s)         return bytesconverter     def graph_data(stock):        stock_price_url =         'https://pythonprogramming.net/yahoo_finance_replacement'        source_code = urllib.urlopen(stock_price_url).read().decode()        stock_data = []        split_source = source_code.split('\n')        line in split_source:            split_line = line.split(',')            if len(split_line) == 7:               if 'values' not in line , 'labels' not in line:                   stock_data.append(line)        date,openp,highp,lowp,closep,adjusted_close,vol =                   np.loadtxt(stock_data,delimiter=',',unpack=true,converters=                 {0:bytespdate2num('%y-%m-%d')})         plt.plot_date(date,closep,'-',label='price')        plt.xlabel('date')        plt.ylabel('price')        plt.title('graph')        plt.legend()        plt.show()    graph_data('tsla')

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