title: How can I concat multiple dataframes in Python?
body: <p>I have multiple (more than 100) dataframes. How can I concat all of them?</p>
  
  <p>The problem is, that I have too many dataframes, that I can not write them manually in a list, like this: </p>
  
  <pre><code>&gt;&gt;&gt; cluster_1 = pd.DataFrame([['a', 1], ['b', 2]],
  ...                    columns=['letter  ', 'number'])
  
  
  &gt;&gt;&gt; cluster_1
    letter  number
  0      a       1
  1      b       2
  
  
  &gt;&gt;&gt; cluster_2 = pd.DataFrame([['c', 3], ['d', 4]],
  ...                    columns=['letter', 'number'])
  
  
  &gt;&gt;&gt; cluster_2
    letter  number
  0      c       3
  1      d       4
  
  
  &gt;&gt;&gt; pd.concat([cluster_1, cluster_2])
    letter number
  0      a       1
  1      b       2
  0      c       3
  1      d       4
  </code></pre>
  
  <p>The names of my N dataframes  are cluster_1, cluster_2, cluster_3,..., cluster_N. The number N can be very high.</p>
  
  <p>How can I concat N dataframes?</p>