What is a lambda function? Give an example.

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ICSM · Answer

A lambda function in Python is a small, anonymous function defined with the
lambda keyword. It can take any number of arguments but has only one expression, which is implicitly returned.
Key points:
Anonymous (no name).Usually used for short, simple functions.Syntax: lambda arguments: expressionReturns the value of the expression.
Example:
# Normal function
def square(x):
    return x * x
# Lambda equivalent
square_lambda = lambda x: x * x
print(square(5))          # Output: 25
print(square_lambda(5))   # Output: 25
Common use case: Sorting with a custom key
points = [(1, 2), (4, 1), (5, 3)]
# Sort by y-coordinate using lambda
points.sort(key=lambda point: point[1])
print(points)  # Output: [(4, 1), (1, 2), (5, 3)]
Lambda functions are handy for quick functions you don’t need to reuse or name explicitly. Want me to show lambda examples in other languages?

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What is a lambda function? Give an example.

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Key points:

Example:

Common use case: Sorting with a custom key

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