I have a function I need to call with a certain amount of parameters based on certain variables, something like this:
self.model = Gtk.ListStore(str for i in len(dictionary))
Of course that doesn't work since str for i in len(dictionary) results in a list: [str, str, str, str]
While I can always just write 4 lines and a bunch of if statements for each alternative there must be a better way of doing this.
Perhaps you could use the * syntax?
self.model = Gtk.ListStore(*[str for i in len(dictionary)])
The * unpacks the list and passes each element as a separate argument to the function.
To repeat the same value x times just multiply it by an int:
Gtk.ListStore(*[str]*len(dictionary))
For arbitrary generators, put a star before a generator to unpack it:
Gtk.ListStore(*(x for bar in spam))
Note that there's no need for a temporary list.
If the function you are calling uses *args, then you can use what I believe is called the splat operator - *.
Example:
def f(*arbitrary_amount_of_arguments):
for i in arbitrary_amount_of_arguments:
print(i)
>>> f("a", "b", "c")
a
b
c
>>> f(*[1, 2, 3, 4, 5, 6, 7])
1
2
3
4
5
6
7
Or in your specific example:
self.model = Gtk.ListStore(*(str for i in range(len(dictionary))))
I would also like to question if you want to pass the inbuilt string class str for i in range(len(dictionary)).
Edit: self.model = Gtk.ListStore(*(str for _ in enumerate(dictionary))) or self.model = Gtk.ListStore(*[[str] * len(dictionary)) are probably better than my previous suggestion in that they are more Pythonic.
