py on a raspberry pi with python 2.7.9 and pip 1.5.6. I installed and uninstalled pyvisa and pyvisa-py several times, but the problems stay. I connected the KEITHLEY Multimeter 2000 per R232 to USB with the Raspberry.
When I run the basic Code:

import visa
rm = visa.ResourceManager('@py')
a=rm.list_resources()
print(a)

I receive:

Traceback (most recent call last):
  File "pyvisa.py", line 1, in <module>
    import visa
  File "/usr/local/lib/python2.7/dist-packages/visa.py", line 16, in <module>
    from pyvisa import logger, __version__, log_to_screen, constants
  File "/home/pi/pyvisa.py", line 2, in <module>
    rm = visa.ResourceManager('@py')
AttributeError: 'module' object has no attribute 'ResourceManager'

as well when I try
python -m visa info

Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/local/lib/python2.7/dist-packages/visa.py", line 16, in <module>
    from pyvisa import logger, __version__, log_to_screen, constants
  File "pyvisa.py", line 1, in <module>
    import visa
  File "/usr/local/lib/python2.7/dist-packages/visa.py", line 16, in <module>
    from pyvisa import logger, __version__, log_to_screen, constants
ImportError: cannot import name logger

On the other hand i can't upgrade, because the requirements are already up-to-date.

pip install pyvisa-py --upgrade
Requirement already up-to-date: pyvisa-py in /usr/local/lib/python2.7/dist-packages
Requirement already up-to-date: pyvisa>=1.8 in /usr/local/lib/python2.7/dist-packages (from pyvisa-py)
Requirement already up-to-date: enum34 in /usr/local/lib/python2.7/dist-packages (from pyvisa>=1.8->pyvisa-py)

I would be very thankfull if somebody could help me with this issue.
"In python 2.7, the import system will always use files in the working directory over the one in site-packages and as your file is named pyvisa.py when importing visa.py it picks your own module instead of the 'real' pyvisa module."MatthieuDartiailh from github
pyvisa-py on raspberry pi AttributeError: 'module' object has no attribute 'ResourceManager'