python bokeh error with output_file in class - python-3.x

Question

I have a probleme using bokeh in a class.
The following code is runing when i use the object "Graph" in the same file (.py), but not when i'm calling the class from an other file, and i don't know why.
class Graph():
import pandas as pd
from bokeh.models import HoverTool
from bokeh.plotting import figure, show, output_file, ColumnDataSource
def __init__(self, df, indicators=None):
self.df = df
self.output_file("test.html" , title='test')
....
I have the following error:
TypeError: output_file() got multiple values for argument 'title'
Does anybody know how can I fix it?
For information, the following code:
class Graph():
import pandas as pd
from bokeh.models import HoverTool
from bokeh.plotting import figure, show, output_file, ColumnDataSource
def __init__(self, df, indicators=None):
self.df = df
self.output_file("test.html")
....
returns:
Traceback (most recent call last):
File "Documents/Programmation/python/Trade/Indicators.py", line 50, in <module>
a = TradeGraph(df)
File "/Users/Alex/Documents/Programmation/python/Graph.py", line 29, in __init__
self.output_file("test.html")
File "/anaconda3/lib/python3.6/site-packages/bokeh/io/output.py", line 77, in output_file
root_dir=root_dir
File "/anaconda3/lib/python3.6/site-packages/bokeh/io/state.py", line 166, in output_file
if os.path.isfile(filename):
File "/anaconda3/lib/python3.6/genericpath.py", line 30, in isfile
st = os.stat(path)
TypeError: stat: path should be string, bytes, os.PathLike or integer, not Graph
and the following code:
class Graph():
import pandas as pd
from bokeh.models import HoverTool
from bokeh.plotting import figure, show, output_file, ColumnDataSource
def __init__(self, df, indicators=None):
self.df = df
self.output_file()
....
returns the same (last) error.
Thanks

Answer 1

You have evidently defined a method output_file on your own class, and that is where the problem is. (As an aside, please always try to ask questions with complete minimal code). Based on the output above, the most likely explanation is that you have forgotten to add the self parameter that Python methods should always have. That is, you have something like:
class Graph(object):
def output_file(title):
when you need something like:
class Graph(object):
def output_file(self, title):
However, I would question the value of having an output_file method at all. Unless you are doing something out of the ordinary, you should just call Bokeh's output_file function directly. However, please also note that output_file activates a persistent implicit mode. That is useful especially in interactive environments, but may not be in a program that saves lots of things. There is also a save function that just gives you explicit control wherever you want to perform a save.

Answer 2

Thank you for you answer,
I finnaly import each need module in each methode.
I thought i could all import them one time beteween the class definition and the class initialisation, but doesn't work,
Thanks