I had two of those python locks on my batteries. However, I had to get a pair of bolt cutters to cut one off last weekend when I returned from a trip. The lock would not turn, no matter what I sprayed into it, and it had been sprayed periodically during the period I used it.
The other one works ok.
Lucky, I knew a state cop with a very large bolt cutter in his cruiser...used to cut padlocks on access control posts when required.
Going to replace them both with just the same gauge cable with some heavy duty padlocks with combinations.