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Showing content from https://github.com/pandas-dev/pandas/issues/8833 below:

unhelpful parser exception when passing names and dtype · Issue #8833 · pandas-dev/pandas · GitHub

In [1]: data = """1.0 1
   ...: 2.0 2
   ...: 3.0 3"""

In [2]: read_csv(StringIO(data),sep='\s+')
Out[2]: 
   1.0  1
0    2  2
1    3  3

In [3]: read_csv(StringIO(data),sep='\s+',header=None)
Out[3]: 
   0  1
0  1  1
1  2  2
2  3  3

In [4]: read_csv(StringIO(data),sep='\s+',header=None,names=['a','b'])
Out[4]: 
   a  b
0  1  1
1  2  2
2  3  3

In [6]: read_csv(StringIO(data),sep='\s+',header=None,names=['a','b'],dtype={'a' : int})
'NoneType' object has no attribute 'dtype'

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