Lambda Functions

lambda is a keyword in Python that is used to create anonymous/lambda functions. These anonymous functions can only take one expression and they can’t contain any statements. Eg:

# This is a normal function
def func1(x):
    return x + 1
 
# This is an anonymous function
func2 = lambda x: x + 1

Both of the above can be called like this:

func1(1) # 2
func2(1) # 2

In general, lambda functions are used when we need to pass a function as an argument to another function.

NOTE 1: lambda functions can be used to create functions that return other functions. This is called a closure. For example:

 def func(x):
     return lambda y: x + y
 
 func1 = func(1)
 func1(2) # 3

NOTE 2: lambda functions can have 0 to any number of Arguments. For example:

 func = lambda: 1
 func() # 1
 
 func = lambda x, y: x + y
 func(1, 2) # 3