title: How can i create a dictionary from a dataframe without specifying column names in pandas?
body: <p>I am trying to convert the dataframe into dictionary in pandas and i got into a problem. When i specify the column names i was able to convert the dataframe into dictionary but when i tried to do without specifying column names but just by column numbers it throws an error. </p>
  
  <p>Here is an example of my dataframe (df1)</p>
  
  <pre><code>                       id                  Crub
      0   At1NC000060_TBH_1             Not found
      1   At1NC005280_TBH_1      Known_Gene_Sense
      2   At1NC007770_TBH_1      Known_Gene_Sense
      3   At1NC018710_TBH_1             Not found
      4   At1NC027560_TBH_1  Known_Gene_Antisense
      5   At1NC030450_TBH_1      Known_Gene_Sense
      6   At1NC031370_TBH_1  Known_Gene_Antisense
      7   At1NC035150_TBH_1  Known_Gene_Antisense
      8   At1NC046250_TBH_1      Known_Gene_Sense
      -------------
      -----------
  </code></pre>
  
  <p>So when it tried to convert to dictionary like below, it works fine</p>
  
  <pre><code>dic1 = dict(zip(df.id,df.Crub))
  print(dic1)
  {'At3NC025390_TBH_1': 'Known_Gene_Antisense', 'At1NC064880_TBH_1': 'Not found', 'At1NC035150_TBH_1': 'Known_Gene_Antisense', 'At3NC044300_TBH_1': 'Known_Gene_Antisense', 'At2NC000610_TBH_1': 'Known_Gene_Antisense'}
  </code></pre>
  
  <p>However when i tried with column number, i get error</p>
  
  <pre><code>col2 = list(df1)[1]
  dic2 = dict(zip(df.id,df.col2))
  print dic2
  
  AttributeError: 'DataFrame' object has no attribute 'col2'
  </code></pre>
  
  <p>I don't know what am i doing wrong here.</p>
  
  <p>ps. The reason i can't specify the column name is i am trying to insert this code as part of another code and so i don't exactly the names of 2nd column but i definitely know that it is the second column.</p>