We may see some *list operation in python script. In this tutorial, we will introduce what it is and how to use it.
Look at this example:
data =  for i in range(10): data.append(i) x = *data
Run this code, we will see: SyntaxError: can’t use starred expression here
Here data is a python list, however, this error means we can not use *data directly.
data =  for i in range(10): data.append(i) x = ["abc", *data] print(x)
Run this code, we will get:
['abc', 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
We find *data will unpack the python data list.
Morever, look at this code below:
def show(*x): print(type(x)) print(x) show(*data)
Run it, we will see:
<class 'tuple'> (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
We find x is a tuple, which means that *data allows to get each element from python list data and save them to a python tuple.
We may also see *args in some python function, it is also python list with star operation.