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39 lines
1.1 KiB
Plaintext
39 lines
1.1 KiB
Plaintext
# Lambda are anonymous functions in Python by using the keyword lambda
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# Therefore they are not bound to a name
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# Simple Lambda Function
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a = lambda parameter: parameter + 40
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#
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print (a(2)) # Outputs 42
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# Lambda Functions Inside Real Functions
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def subtract_func(n) :
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return lambda x: x - n
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#
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a = subtract_func(1) # Sets n to 1 for a
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b = subtract_func(2) # Sets n to 2 for b
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#
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print(a(-4)) # Outputs -5 ( -5 = -4 - 1 )
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print(b(-2)) # Outputs -4 ( -4 = -2 - 2 )
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# Lambda Function with Multiple Parameters
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f = lambda x, y : x + y
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#
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print( f(1,1) ) # Outputs 2 ( 1 + 1 )
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# map() + lambda functions
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a = [1, 2, 3, 4, 5]
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b = [1, 2, 3, 4, 5]
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#
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r = map(lambda x,y : x+y, a,b) # map() will return an iterator
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r_list = list(r) # listify r
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print(r_list) # prints [2, 4, 6, 8, 10]
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# filter() + lambda functions
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# Program to filter out only the even items from a list
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my_list = [1, 5, 4, 6, 8, 11, 3, 12]
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#
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new_list = list(filter(lambda x: (x%2 == 0) , my_list))
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#
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print(new_list) # Output: [4, 6, 8, 12]
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