Added python lambda

sheets/_python/lambda

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+# Lambda are anonymous functions in Python by using the keyword lambda
+# Therefore they are not bound to a name 
+
+# Simple Lambda Function 
+a = lambda para1: para1 + 40
+
+print g(2)                       # Outputs 42
+
+
+# Lambda Functions Inside Real Functions
+def subtract_func(n) : 
+    return lambda x: x - n
+
+a = subtract_func(1)             # Sets n to 1 for a
+b = subtract_func(2)             # Sets n to 2 for b 
+
+print( a(-4) )                   # Outputs -5 ( -5 = -4 - 1 )
+print( a(-2) )                   # Outputs -4 ( -4 = -2 - 2 )
+
+
+# Multiple Parameters 
+f = lambda x, y : x + y 
+
+print( f(1,1) )                  # Outputs 2 ( 1 + 1 )
+
+
+# map() Functions 
+a = [1, 2, 3, 4, 5]              
+b = [1, 2, 3, 4, 5]             
+
+r = map( lambda x,y : x+y, a,b ) # map() will return an iterator  
+r_list = list( r )               # listify r 
+
+print(r_list)                    # prints [2, 4, 6, 8, 10] 
+
+
+# filter() Functions 
+# Program to filter out only the even items from a list
+my_list = [1, 5, 4, 6, 8, 11, 3, 12]
+
+new_list = list(filter(lambda x: (x%2 == 0) , my_list))
+
+print(new_list) 				 # Output: [4, 6, 8, 12]