'Assigning empty list
I don't really know how I stumbled upon this, and I don't know what to think about it, but apparently [] = [] is a legal operation in python, so is [] = '', but '' = [] is not allowed. It doesn't seem to have any effect though, but I'm wondering: what the hell ?
Solution 1:[1]
This is related to Python's multiple assignment (sequence unpacking):
a, b, c = 1, 2, 3
works the same as:
[a, b, c] = 1, 2, 3
Since strings are sequences of characters, you can also do:
a, b, c = "abc" # assign each character to a variable
What you've discovered is the degenerative case: empty sequences on both sides. Syntactically valid because it's a list on the left rather than a tuple. Nice find; never thought to try that before!
Interestingly, if you try that with an empty tuple on the left, Python complains:
() = () # SyntaxError: can't assign to ()
Looks like the Python developers forgot to close a little loophole!
Solution 2:[2]
Do some search on packing/unpacking on python and you will find your answer. This is basically for assigning multiple variables in a single go.
>>> [a,v] = [2,4]
>>> print a
2
>>> print v
4
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
| Solution | Source |
|---|---|
| Solution 1 | |
| Solution 2 | saurabh baid |