Prevent left-hand-side assigning on flowline objects

[fmaussion]

since flowline.section = new_section works, it is natural to want to try something like: flowline.section[88] = 0 and expect it to work.

The command above will silently do nothing.

Is there a way to prevent this in python by raising an error? The relevant code is here:

oggm/oggm/core/flowline.py

Lines 185 to 187 in a63521c

	@section.setter
	def section(self, val):
	self.thick = (0.75 * val * np.sqrt(self.bed_shape))**(2./3.)

I really don't know if there is a simple way to check for this...

Thanks @drounce for the report

[fmaussion]

Correction: the relevant code is here:

oggm/oggm/core/flowline.py

Lines 181 to 187 in a63521c

	@property
	def section(self):
	return 2./3. * self.widths_m * self.thick
	@section.setter
	def section(self, val):
	self.thick = (0.75 * val * np.sqrt(self.bed_shape))**(2./3.)

So the problem in this line:

flowline.section[88] = 0

Is that it's the getter which is called and then the returned array is indexed at 88 and then changed.

I think there is no way to prevent this to happen, and it seems to be a perfect example where "too much fancy" is sometimes not good...