Bug report

Bug summary

Function is_string_like returns True for numpy object arrays

Code for reproduction

import numpy as np
from matplotlib.cbook import is_string_like
print(is_string_like(np.array(map(str, [1,2,3]), dtype=object)))

Actual outcome

True

Expected outcome

False

The problem is that the line 707 obj + '' in is_string_like does not generate an exception with such numpy array.

Matplotlib version

• Matplotlib version: 1.5.3
• OS: Ubuntu 14.04
• Python and Matplotlib Installed with Anaconda