Problem With Tkinter Font

[Wildman]

Python 3.4.2
Tkinter 8.6
Linux

I want to set the font in a GUI program I am working on.
Here is the pertinent code I am using...

from tkinter import font

myfont = font.Font(family='Helvetica', size=10, weight='bold')

Here is the error I get...

Traceback (most recent call last):
File "./test.py", line 41, in <module>
myfont = font.Font(family='Helvetica', size=10, weight="bold")
File "/usr/lib/python3.4/tkinter/font.py", line 93, in __init__
tk.call("font", "create", self.name, *font)
AttributeError: 'NoneType' object has no attribute 'call'

From my research, the syntax is correct but I am having
doubts. Can anyone clarify?

--
<Wildman> GNU/Linux user #557453
The cow died so I don't need your bull!

[Peter Otten]

Wildman via Python-list wrote:

> Python 3.4.2
> Tkinter 8.6
> Linux
>
> I want to set the font in a GUI program I am working on.
> Here is the pertinent code I am using...
>
> from tkinter import font
>
> myfont = font.Font(family='Helvetica', size=10, weight='bold')
>
> Here is the error I get...
>
> Traceback (most recent call last):
> File "./test.py", line 41, in <module>
> myfont = font.Font(family='Helvetica', size=10, weight="bold")
> File "/usr/lib/python3.4/tkinter/font.py", line 93, in __init__
> tk.call("font", "create", self.name, *font)
> AttributeError: 'NoneType' object has no attribute 'call'
>
> From my research, the syntax is correct but I am having
> doubts. Can anyone clarify?

If you do not provide the root argument there is still an implicit
dependency:

"""
class Font:
...
def __init__(self, root=None, font=None, name=None, exists=False,
**options):
if not root:
root = tkinter._default_root
tk = getattr(root, 'tk', root)

"""

>>> import tkinter
>>> from tkinter import font
>>> font.Font(family="Helpvetica", size=10, weight="bold")

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "/usr/lib/python3.4/tkinter/font.py", line 93, in __init__
tk.call("font", "create", self.name, *font)
AttributeError: 'NoneType' object has no attribute 'call'

>>> root = tkinter.Tk()
>>> font.Font(family="Helpvetica", size=10, weight="bold")
<tkinter.font.Font object at 0x7fb9fdfdb6d8>

So you have to create the main window before you can create a Font.

[Wildman]

OK, that makes sense. I knew I was doing something dumb
or in this case, not doing it. Thank you.