DataFrame.plot error when both 'color' and 'style' arguments are passed (original) (raw)

In pandas 0.15.2, when passing both arguments 'color' and 'style' to the plot method, there is an error which I think should be raised only when there is a color symbol in the style string. But in the example below, the error is raised even though there is no color symbol in the line string:

from pandas import DataFrame
import numpy as np
df = DataFrame({'a': np.random.rand(10), 'b': np.random.rand(10), 'c': np.random.rand(10)})
df.plot(color = ['red', 'black', 'blue'], style = ['-', '--', '-'])

The error is not clear (TypeError: expected string or buffer). This should be fixed, although it is easy to work around:

df.plot(style = ['r-', 'k--', 'b-'])