Practicing Lambda Functions in Python

Why I studied this

I wanted to understand what lambda functions are and how they are used in Python.
They are useful for short, one-time functions especially when combined with tools like filter, map, or function parameters.

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What I did

Regular function vs lambda

def add(x=0, y=0, z=0):
    return x + y + z

myadd = add
print(myadd(3, 4, 5))  # 12

Functions are just variables. I assigned the add function to another name and used it.

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Passing functions as parameters

def myfunc(x, y, callback):
    result = callback(x, y)
    print(result)

def add(x, y):
    return x + y

myfunc(4, 5, add)
myfunc(4, 5, lambda x, y: x - y)

I can pass a function as a parameter.
lambda x, y: x - y is a one-time function that subtracts two numbers.

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Lambda functions in a list

funcList = [
    lambda x, y: x + y,
    lambda x, y: x - y,
    lambda x, y: x * y,
    lambda x, y: x / y,
]

for func in funcList:
    print(func(9, 7))

I made a list of lambda functions to perform different math operations.

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Using lambda with filter()

a = [1,2,3,4,5,6,7,8,9,10]

def isEven(n):
    return n % 2 == 0

for i in filter(isEven, a):
    print(i)

# same as above with lambda
for i in filter(lambda x: x % 2 == 0, a):
    print(i)

filter() uses a function to select only items that return True.
Lambdas are useful for writing these short filters.

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What I learned

Lambda functions are great for writing quick, simple logic.
They can be passed like normal functions, and help clean up code when used with things like filter().

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What I want to do next

I want to try using lambda with map() and sorted(), and understand where lambdas are better than regular def functions.