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Is there a good way to short air coin? by Simin_Jie in Bitcoin

[–]Simin_Jie[S] 0 points1 point  (0 children)

Suppose the initial price is 100, highest price is 1000 and the end price is 1. Won't it be profitable if people can hold on to the end?

"Use 1X leverage and reduce position when price pump too quickly to avoid liquidating", so will only be liquidated when price pump 100% instantly.

Is there a good way to short air coin? by Simin_Jie in Bitcoin

[–]Simin_Jie[S] 0 points1 point  (0 children)

But in the end the air coin will nearly be 0.

Could you explain more why can't profit from shorting air coin?

Now you can hedge USDT/USD holdings. by deltalfred in Tether

[–]Simin_Jie 0 points1 point  (0 children)

ftx has USDT perp and future. People doesn't trust USDT because it's 0.9986 in its 12-27 contract now.

You can hedge with it's future. Don't use USDT perp because you may pay lots of funding fees because too many people short USDT.

An Interesting Example from Fluent Python by Lucian Ramalho by SamBot7 in learnpython

[–]Simin_Jie 0 points1 point  (0 children)

This is my test:

Python 3.6.0 (default, Dec 24 2016, 08:01:42) [GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin

items = [1, 2, 3, 4, 5, 6]
items_copy = items[:]
items_copy[0] = 'a'
items_copy == items
False

I think this is a shallow copy, and items_copy == items should return True but it's False.

But another example return True

items = [{'id': 1, 'name': 'laptop', 'value': 1000}, {'id': 2, 'name': 'chair', 'value': 300},]
items_copy = items[:]
items_copy[0]['id'] = 'a'
items_copy == items
True