![]() So, performing this is very easy, and can be useful at times. Let’s have a look at the output now –Īs you can see, in the output, the first variable got a value, and then the second variable got a list, as specified, and then we have the other two values. So, only two values would be left for those variables in the end, and the other values before that would go into the list. But the thing is that after that, we have two more variables there. Let’s have a look at the program below.Īs you can see, in the below program, we have used the asterisk before the num2 variable, so now, the values in the num2 would be assigned as a list. Also, it is not a compulsion to use the asterisk at the ending variable only. Let’s have a look at the output of the above program.Īs you can see, we have got the output. But the thing is that before the fourth variable, we have made use of the asterisk, so the values here would be added as a list, and in the output, you would find the other values in the list. The use of (b, c) in the signature requires that the second argument to the function be a sequence of length two (e.g., 42, -13 ). An example is: def fxn(a, (b, c), d): pass. Let’s have a look at the below program, to understand the same thing.Īs you can see in the above program, we have a tuple, which has 9 values, and then we have 4 variables. Tuple parameter unpacking is the use of a tuple as a parameter in a function signature so as to have a sequence argument automatically unpacked. We can use an asterisk before some variable, and then the values would be assigned as a list, to the variable. Now, in order to overcome this, we can do one thing. But the thing is that it says too many values to unpack. Packing and Unpacking a Tuple: In Python, there is a very powerful tuple assignment feature that assigns the right-hand side of values into the left-hand side. You can get a similar message, but it depends on how many variables you have given. Unpacking a tuple: fruits ('apple', 'banana', 'cherry') (green, yellow, red) fruits print(green) print(yellow) print(red) Try it Yourself Note: The number of variables must match the number of values in the tuple, if not, you must use an asterisk to collect the remaining values as a list. In such a situation, we get an error, which says – ValueError: too many values to unpack (expected 3). Let’s have a look at that too.Īs you can see, in the above program, we have 4 elements in the tuple, and then we are having only three variables. But now, Let’s say that there are more values in the tuple, and we have a lesser number of variables, then we are going to get into an error. Now, in the previous example, we had four elements to unpack, and we had four variables, so everything was fine. It’s like tuple unpacking except that the args is a tuple, not a list. As you can see, we got the corresponding output from the program. When passing the positional arguments 10, 20, 30, and 40 to the function, Python assigns 10 to x, 20 to y, and a tuple (30, 40) to args.
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