Problem printing column headers

[Richard Stanton]

Using today's development version, I wanted to print the column headers of
a dataframe, so tried the following:

df = DataFrame({'A' : [1,2,3], 'B' : [4,5,6]})
print df.columns.tostring()

This looked like it ought to work, and didn't complain I was asking it to
do something illegal, but produced garbage. Bug or user error?

[Jeff]

tostring is not really a public method

 

In [1]: df = DataFrame({'A' : [1,2,3], 'B' : [4,5,6]})

In [2]: df.columns
Out[2]: Index([u'A', u'B'], dtype=object)

# returns the repr

In [3]: str(df.columns)
Out[3]: "Index([u'A', u'B'], dtype=object)"

 

# a list

In [4]: df.columns.tolist()
Out[4]: ['A', 'B']

 

# they act like a list
In [6]: ','.join(df.columns)
Out[6]: 'A,B'