title: strptime() argument 0 must be str, not <class 'bytes'>
body: <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  import matplotlib.dates as mdates
  
  date,open,close=np.loadtxt('000001.csv',delimiter=',',
                              converters={0:mdates.strpdate2num('%m/%d/%Y')},
                              skiprows=1, usecols=(0,1,4), unpack=True)
  
  plt,plot(date,open)
  </code></pre>
  
  <p>But  <code>strptime()</code> argument 0 must be str, not </p>
  
  <p>I have read all of about answers in the website, but these don't help me.</p>