collections.ChainMap not support in Python2

I am using Python 2.7.13, when try to use pysnooper.snoop decorator, meet the AttributeError exception, the reason is collections.ChainMap is used in tracer.py, which is not supported in Python2.x.

code is here: https://github.com/cool-RR/PySnooper/blob/master/pysnooper/tracer.py#L27

hoping PySnooper is fully compatible with python2

[monhz]

from ConfigParser import _Chainmap as ChainMap works fine in 2.7.

[blargomat]

unfortunately even after upgrading via pip (tested it just now) i still got:

  File "/usr/local/lib/python2.7/dist-packages/pysnooper/tracer.py", line 162, in trace
    get_local_reprs(frame, variables=self.variables)
  File "/usr/local/lib/python2.7/dist-packages/pysnooper/tracer.py", line 28, in get_local_reprs
    locals_and_globals = collections.ChainMap(frame.f_locals, frame.f_globals)
  AttributeError: 'module' object has no attribute 'ChainMap'

however this works in tracer.py but requires the chainmap pip package 😕

locals_and_globals = None
if sys.version_info.major > 2:
    locals_and_globals = collections.ChainMap(frame.f_locals, frame.f_globals)
else:
    from chainmap import ChainMap
    locals_and_globals = ChainMap(frame.f_locals, frame.f_globals)