Traceback (most recent call last):


 "/usr/lib/python2.7/site-packages/nose/case.py", line 197, in runTest

self.test(*self.arg)
TypeError: test_z_file() takes exactly 1 argument (0 given)

Traceback (most recent call last):


 "C:\Users\charikleia.bitsakou\AppData\Local\Continuum\anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 3249, in run_ast_nodes

elif mode == 'single':


 "C:\Users\charikleia.bitsakou\AppData\Local\Continuum\anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 3343, in run_code

result.error_in_exec = value


 "C:\Users\charikleia.bitsakou\AppData\Local\Continuum\anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 2043, in showtraceback

# in the engines. This should return a list of strings.


 "C:\Users\charikleia.bitsakou\AppData\Local\Continuum\anaconda3\lib\site-packages\IPython\core\ultratb.py", line 1385, in structured_traceback

out=None, tb_offset=None):


 "C:\Users\charikleia.bitsakou\AppData\Local\Continuum\anaconda3\lib\site-packages\IPython\core\ultratb.py", line 1288, in structured_traceback


 "C:\Users\charikleia.bitsakou\AppData\Local\Continuum\anaconda3\lib\site-packages\IPython\core\ultratb.py", line 1150, in structured_traceback

# (5 blanks lines) where none should be returned.
TypeError: can only concatenate str (not "list") to str
