title: IndexError: invalid slice
body: <p>i´ve got the following code.   </p>
  
  <pre><code>pd.__version__
  
  hr1 = np.loadtxt("Spot_2013_Hour1.txt")
  hr2 = np.loadtxt("Spot_2013_Hour2.txt")
  hr3 = np.loadtxt("Spot_2013_Hour3.txt")
  hr4 = np.loadtxt("Spot_2013_Hour4.txt")
  hr5 = np.loadtxt("Spot_2013_Hour5.txt")
  hr6 = np.loadtxt("Spot_2013_Hour6.txt")
  hr7 = np.loadtxt("Spot_2013_Hour7.txt")
  hr8 = np.loadtxt("Spot_2013_Hour8.txt")
  hr9 = np.loadtxt("Spot_2013_Hour9.txt")
  hr10 = np.loadtxt("Spot_2013_Hour10.txt")
  hr11 = np.loadtxt("Spot_2013_Hour11.txt")
  hr12 = np.loadtxt("Spot_2013_Hour12.txt")
  hr13 = np.loadtxt("Spot_2013_Hour13.txt")
  hr14 = np.loadtxt("Spot_2013_Hour14.txt")
  hr15 = np.loadtxt("Spot_2013_Hour15.txt")
  hr16 = np.loadtxt("Spot_2013_Hour16.txt")
  hr17 = np.loadtxt("Spot_2013_Hour17.txt")
  hr18 = np.loadtxt("Spot_2013_Hour18.txt")
  hr19 = np.loadtxt("Spot_2013_Hour19.txt")
  hr20 = np.loadtxt("Spot_2013_Hour20.txt")
  hr21 = np.loadtxt("Spot_2013_Hour21.txt")
  hr22 = np.loadtxt("Spot_2013_Hour22.txt")
  hr23 = np.loadtxt("Spot_2013_Hour23.txt")
  hr24 = np.loadtxt("Spot_2013_Hour24.txt")
  
  # ao[0:2]
  
  # ao.shape
  
  dates = pd.date_range('2013/01/01', '2013/12/31', freq='D')
  # dates.shape
  
  Allhrs = Series(index=dates)
  
  Allhrs = DataFrame({'hr1': hr1,'hr2': hr2, 'hr3': hr3, 'hr4': hr4, 'hr5': hr5, 
  'hr6': hr6, 'hr7': hr7, 'hr8': hr8, 'hr9': hr9, 'hr10': hr10, 'hr11': hr11, 
  'hr12': hr12, 'hr13': hr13, 'hr14': hr14, 'hr15': hr15, 'hr16': hr16, 
  'hr17': hr17, 'hr18': hr18, 'hr19': hr19, 'hr20': hr20, 'hr21': hr21, 
  'hr22': hr22, 'hr23': hr23, 'hr24': hr24})
  
  
  Allhrs.head()
  # plotting for specific time frames as seen below
  
  Allhrs['2013/01/01':'2013/12/31'].plot()
  </code></pre>
  
  <p>this is the outcome: </p>
  
  <pre><code>Traceback (most recent call last):
  
    File "&lt;ipython-input-101-f4dabb5e6973&gt;", line 52, in &lt;module&gt;
      Allhrs['2013/01/01':'2013/12/31'].plot()
  
    File "/Applications/anaconda/lib/python2.7/site-packages/pandas/core/frame.py", line 1674, in __getitem__
      return self._getitem_slice(indexer)
  
    File "/Applications/anaconda/lib/python2.7/site-packages/pandas/core/frame.py", line 1701, in _getitem_slice
      return self._slice(key, axis=0)
  
    File "/Applications/anaconda/lib/python2.7/site-packages/pandas/core/generic.py", line 1136, in _slice
      return self._constructor(self._data.get_slice(slobj, axis=axis))
  
    File "/Applications/anaconda/lib/python2.7/site-packages/pandas/core/internals.py", line 2350, in get_slice
      new_blocks = [blk.getitem_block(slicer) for blk in self.blocks]
  
    File "/Applications/anaconda/lib/python2.7/site-packages/pandas/core/internals.py", line 164, in getitem_block
      new_values = self._slice(slicer)
  
    File "/Applications/anaconda/lib/python2.7/site-packages/pandas/core/internals.py", line 148, in _slice
      return self.values[slicer]
  
  IndexError: invalid slice
  </code></pre>
  
  <p>can someone please tell me how to define the DataFrame correctly? it says that the code line is too long) how do i make it short if i want 24 columns for my dataframe? </p>
  
  <p>thanks</p>