title: Python print according to the shape of pyramid
body: <p><strong>My csv data likes this:</strong>
  <a href="https://i.stack.imgur.com/QtUdh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QtUdh.png" alt="enter image description here"></a></p>
  
  <p><strong>I use this code to print:</strong></p>
  
  <pre><code>import pandas as pd
  import csv
  rs = pd.read_csv(r'D:/Clustering_TOP.csv',encoding='utf-8')
  with open('D:/Clustering_TOP.csv','r') as csvfile:
      reader = csv.reader(csvfile)
      rows = [row for row in reader]
  csv_title = rows[0]
  csv_title = csv_title[1:]
  len_csv_title = len(csv_title)
  for i in range(len_csv_title):
      for j in range(i,len_csv_title):
          print(str(rs[csv_title[i]].corr(rs[csv_title[j]])), end='\t')
      print()
  </code></pre>
  
  <p><strong>The result of printing is this，the format is not right：</strong>
  <a href="https://i.stack.imgur.com/LH10l.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LH10l.png" alt="enter image description here"></a></p>
  
  <p><strong>But in fact,I want the printing likes pyramid,for example:</strong>
  <a href="https://i.stack.imgur.com/viQj2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/viQj2.png" alt="enter image description here"></a></p>
  
  <p><strong>How to modify my code?</strong></p>