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lambda functions

All the functions we defined were previously saved in memory after the first code running. But sometimes there is no need to define a separate function, especially if we need to make simple actions. In that case, we can define anonymous Lambda functions in Python have the following syntax:

lambda var1, var2, ... : something...

For example, we can rewrite our first function with lambda function (returns the sum of two numbers squared)

# define lambda function
sq = lambda x, y: (x+y)**2
# test it
print('Sum of 2 and 3 squared is', sq(2,3))

              
1234

            
# define lambda function
sq = lambda x, y: (x+y)**2
# test it
print('Sum of 2 and 3 squared is', sq(2,3))
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Tehtävä

Swipe to start coding

Define a lambda function doing the same as in Chapter 2 (function with three arguments which returns the sum of tripled first number, doubled second and third and all raised to the second power.)

Ratkaisu

# define a lambda function
fun = lambda a, b, c: (3*a + 2*b + c)**2
# test it
print(fun(1,2,3))
print(fun(3,2,1))

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Osio 7. Luku 7
# define a lambda function
fun = _ _ _ a, b, c: (_ _ _)_ _ _
# test it
print(fun(1,2,3))
print(fun(3,2,1))

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