how to Unpack a Collection in python

Question

Anubhav Kumar · Answer

In Python, unpacking means expanding a collection (like a 
list, tuple, set, or dict) into individual elements.
1. Unpack Lists / Tuples
nums = [1, 2, 3]
a, b, c = nums
print(a, b, c)  # 1 2 3
With * (extended unpacking)
nums = [1, 2, 3, 4, 5]
first, *middle, last = nums
print(first)   # 1
print(middle)  # [2, 3, 4]
print(last)    # 5
2. Unpack in Function Calls
def add(a, b, c):
    return a + b + c
nums = [1, 2, 3]
print(add(*nums))  # 6
3. Unpack Dictionaries (**)
def greet(name, age):
    print(f"Hello {name}, you are {age} years old.")
person = {"name": "Alice", "age": 25}
greet(**person)
# Hello Alice, you are 25 years old.
4. Merge Collections
list1 = [1, 2]
list2 = [3, 4]
merged = [*list1, *list2]
print(merged)  # [1, 2, 3, 4]
dict1 = {"a": 1}
dict2 = {"b": 2}
merged_dict = {**dict1, **dict2}
print(merged_dict)  # {'a': 1, 'b': 2}
5. Ignore Values with _
nums = [10, 20, 30]
a, _, c = nums
print(a, c)  # 10 30
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how to Unpack a Collection in python

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1 Answers

1. Unpack Lists / Tuples

With `*` (extended unpacking)

2. Unpack in Function Calls

3. Unpack Dictionaries (`**`)

4. Merge Collections

5. Ignore Values with `_`

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