1+ """
2+ What is a lambda function in Python?
13
4+ A lambda function is a small anonymous function defined with the 'lambda' keyword.
5+ It can take any number of arguments but can only have one expression.
26
3- def squareNumber (n ):
4- if type (n ) == int :
5- return n * n
6- else :
7- return 0
7+ Syntax:
8+ lambda arguments: expression
9+ """
810
9- def checkForEven (n ):
10- if type (n ) is not int :
11- return
12- return n % 2 == 0
11+ # Example 1: Basic lambda function
12+ add = lambda x , y : x + y
13+ print ("add(2, 3):" , add (2 , 3 )) # Output: 5
1314
14- def add (x , y ):
15- return x + y
16- print (squareNumber (10 ))
15+ # Example 2: Lambda with map
16+ numbers = [1 , 2 , 3 , 4 ]
17+ squared = list (map (lambda x : x ** 2 , numbers ))
18+ print ("Squared numbers:" , squared ) # Output: [1, 4, 9, 16]
1719
18- # if you want to pass a list as a parameter, then will the above function (add()) block will support?
20+ # Example 3: Lambda with filter
21+ evens = list (filter (lambda x : x % 2 == 0 , numbers ))
22+ print ("Even numbers:" , evens ) # Output: [2, 4]
1923
20- # NO
24+ # Example 4: Lambda with sorted
25+ pairs = [(2 , 3 ), (1 , 4 ), (5 , 0 )]
26+ sorted_pairs = sorted (pairs , key = lambda pair : pair [1 ])
27+ print ("Pairs sorted by second element:" , sorted_pairs ) # Output: [(5, 0), (2, 3), (1, 4)]
2128
22- sampleList = [1 ,2 ,3 ,4 ,5 ]
23- outputList = []
24- for i in sampleList :
25- outputList .append (squareNumber (i ))
29+ # Comparison: Regular function vs lambda
30+ def multiply (x , y ):
31+ return x * y
2632
27- print ( outputList )
33+ multiply_lambda = lambda x , y : x * y
2834
35+ print ("multiply(3, 4):" , multiply (3 , 4 )) # Output: 12
36+ print ("multiply_lambda(3, 4):" , multiply_lambda (3 , 4 )) # Output: 12
2937
30- outputList2 = []
31- for i in sampleList :
32- if checkForEven (i ):
33- outputList2 .append (i )
34- print ("output list 2 is " , outputList2 )
35- # ===================================================
36- 37- evenNum = list (filter (lambda x : x % 2 == 0 , sampleList ))
38- print (evenNum )
39- 40- 41- sqNum = list (map (squareNumber , sampleList ))
42- print ("sqNum is .. " , sqNum )
43- 44- globalExample = map (lambda x , y : (x + y , x - y , x * y ), [10 , 20 , 30 , 40 ],[5 ,10 ,15 ,20 ])
45- globalExample = map (lambda x , y : (x + y , x - y , x * y ), [10 , 20 , 30 , 40 ],[5 ,10 ,15 ,20 ])
46- print (list (globalExample ))
47- 48- 49- 50- 51- 52- # List of strings
53- l = ['sat' , 'bat' , 'cat' , 'mat' ]
54- 55- opList = []
56- for i in l :
57- opList .append (list (i ))
58- print (opList )
59- 60- map (list , l )
61- 62- 63- 64- # class calculator:
65- # add = lambda x,y: x+y
66- # sub = lambda x,y: x-y
67- # mul = lambda x,y: x*y
68- 69- # def add(a,b):
70- # return a+b
71- 72- # print("here you go ...")
73- 74- # cal = calculator()
75- 76- # print(calculator.add(10,5))
77- 38+ # Note: Lambda functions are best for short, simple operations.
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