Q.Example 10.2: Tuple assignment — assign respective values from a tuple on the right side to a tuple of variables on the left side: (num1,num2) = (10,20); unpack record = ("Pooja",40,"CS") into (name,rollNo,subject); and show that (a,b,c,d) = (5,6,8) raises ValueError: not enough values to unpack (expected 4, got 3).

Tuple assignment matches values to variables by position: the first value on the right goes to the first name on the left, and so on. The count on both sides must be equal, or Python raises ValueError.

(num1, num2) = (10, 20)              # num1=10, num2=20
(name, rollNo, subject) = ("Pooja", 40, "CS")   # unpacking a record
(a, b, c, d) = (5, 6, 8)             # 4 names, 3 values

The last line fails with:

ValueError: not enough values to unpack (expected 4, got 3) …

The idea. Python allows a tuple of variables on the left of = and a tuple of values on the right; it then unpacks them positionally. This is how a single record like ("Pooja", 40, "CS") is split into meaningful named parts in one statement — no indexing needed. The safety rule is strict: exactly one value per variable.

Program (as printed in the example):

(num1, num2) = (10, 20)            # values assigned position by position
print("num1:", num1)
print("num2:", num2)

record = ("Pooja", 40, "CS")
(name, rollNo, subject) = record   # unpacking a record
print("name:", name)
print("rollNo:", rollNo)
print("subject:", subject)

(a, b, c, d) = (5, 6, 8)           # 4 variables but only 3 values -> ValueError

Verified run:

num1: 10
num2: 20
name: Pooja
rollNo: 40
subject: CS
Traceback (most recent call last):
  File "test.py", line 11, in <module>
    (a, b, c, d) = (5, 6, 8)           # 4 variables but only 3 values -> ValueError
    ^^^^^^^^^^^^
ValueError: not enough values to unpack (expected 4, got 3)

What happened:

• (num1, num2) = (10, 20) — position 1 to num1, position 2 to num2.
• (name, rollNo, subject) = record — unpacking a 3-field record into three named variables; order in the tuple defines meaning. …