title: How to replace elements in a nested list python 3?
body: <p>How to replace elements in a particular position nested list python 3? i want to insert elements in <code>a[1]</code> position. The inserted elements are in list b. </p>
  
  <pre><code>a = [['04\01\1997','alphanum4569874','22','4.0'],['07\01\1997','Anee_69213654','23','2.0']]
  
  b = ['alphanum1','alphanum2']
  
  for idx,item in enumerate(b):
      for i in b:
          a[1].append(i)
  
  print(a)
  </code></pre>
  
  <p>Expected Output:</p>
  
  <pre><code>[['04\01\1997','alphanum1','22','4.0'['07\01\1997','alphanum1','23','2.0']]
  </code></pre>
  
  <p>Current Output:</p>
  
  <pre><code>[['04\x01\x01997', 'alphanum4569874', '22', '4.0'], ['07\x01\x01997', 'Anee_69213654', '23', '2.0', 'alphanum1', 'alphanum2', 'alphanum1', 'alphanum2']]
  </code></pre>