import graph_tool error

I re-install graph_tool, but just running "from graph_tool.all import *" shows the following errors:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/graph_tool/all.py", line 35, in <module>
    from graph_tool.draw import *
  File "/usr/lib/python2.7/dist-packages/graph_tool/draw/__init__.py", line 797, in <module>
    from .cairo_draw import graph_draw, cairo_draw, get_hierarchy_control_points, default_cm
  File "/usr/lib/python2.7/dist-packages/graph_tool/draw/cairo_draw.py", line 1855, in <module>
    from .. community import get_hierarchy_tree, NestedBlockState, BlockState, OverlapBlockState
  File "/usr/lib/python2.7/dist-packages/graph_tool/community/__init__.py", line 128, in <module>
    from . blockmodel import minimize_blockmodel_dl, BlockState, mcmc_sweep, \
  File "/usr/lib/python2.7/dist-packages/graph_tool/community/blockmodel.py", line 2832, in <module>
    from . covariate_blockmodel import *
  File "/usr/lib/python2.7/dist-packages/graph_tool/community/covariate_blockmodel.py", line 269
    def context_wrapper(*args, revert=False):
                                    ^
SyntaxError: invalid syntax

Thanks!