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In Python, a for loop runs through each element in a list (or generator). So the correct form of the first loop is:

for x in a:
    print(x)

In addition, in Python we can write:

x, y = (1, 2)

From now on, x is 1 and y is 2. We can also write:

x, y = [1, 2]

Has the same effect.
If we write: x, y = 1There is an error, except for the exact same error in one of your for loops.

In the second f example the list [['one', 'two']]只有個元素，就是['one', 'two']。for循環(huán)要跑一次，這一次p, q就是['one', 'two'] is similar to the example above.

In the first example, a has two elements, namely 'one', 'two'. The assignment is uncertain on p and q.
In the second example, a has an element ['one', 'two' '], the order is determined.

p, q = [x, y] //可行
p, q = x, y//不確定