Today, we will look at another exciting combination technique in Python.
Let’s start with a pure music piece~
filter() is a built-in higher-order function in Python used to filter iterable objects (such as lists, tuples, etc.). By combining it with a lambda function, we can succinctly define filtering conditions. For example, filtering even numbers:
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]# Using lambda + filter to select even numbers
even_numbers = list(filter(lambda x: x % 2 == 0, numbers))
print(even_numbers) # Output: [2, 4, 6, 8, 10]Another example is filtering a list of dictionaries (such as people aged 18 and above):
people = [ {"name": "Alice", "age": 17}, {"name": "Bob", "age": 22}, {"name": "Charlie", "age": 15}, {"name": "David", "age": 30}]# Filtering people aged ≥ 18
adults = list(filter(lambda person: person["age"] >= 18, people))
print(adults)# Output: [{'name': 'Bob', 'age': 22}, {'name': 'David', 'age': 30}]All of this can be done in just one line of code, concise and practical!
As the music ends, today’s learning also comes to a close~
Recommended Reading
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Basic Python Algorithms – Get the Largest k Elements in One Line of Code
- Basic Python Algorithms – Get the Largest k Elements
- Prime Number Determination (Square Root Complexity)
- Basic Python Algorithms – Prime Number Determination
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Python Programming Tips – Lambda Functions and Map
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Python Programming Tips – Lambda Functions and Map
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Basic Python Algorithms – Implementing List Left Rotation in One Line of Code
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Basic Python Algorithms – Implementing List Left Rotation in One Line of Code
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Basic Python Algorithms – Narcissistic Number Determination
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Basic Python Algorithms – Narcissistic Number Determination
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