HTML tutorial
CSS3 tutorial
Bootstrap tutorial
JavaScript tutorial
JQuery tutorial
AngularJS tutorial
React tutorial
NodeJS tutorial
PHP tutorial
Python tutorial
Python3 tutorial
Django tutorial
Linux tutorial
Docker tutorial
Ruby tutorial
Java tutorial
C tutorial
C ++ tutorial
Perl tutorial
JSP tutorial
Lua tutorial
Scala tutorial
Go tutorial
ASP.NET tutorial
C # tutorial
A lambda function is a small anonymous function.A lambda function can take any number of arguments, but can only have one expression
lambda arguments : expression
The expression is executed and the result is returned:
Add 10 to argument a
, and
return the result:
x = lambda a : a + 10
print(x(5))
Lambda functions can take any number of arguments:
Multiply argument a
with argument
b
and return the
result:
x = lambda a, b : a * b
print(x(5, 6))
Summarize argument a
,
b
, and c
and
return the
result:
x = lambda a, b, c : a + b + c
print(x(5, 6,
2))
The power of lambda is better shown when you use them as an anonymous function inside another function.
Say you have a function definition that takes one argument, and that argument will be multiplied with an unknown number:
def myfunc(n):
return lambda a : a * n
Use that function definition to make a function that always doubles the number you send in:
def myfunc(n):
return lambda a : a * n
mydoubler = myfunc(2)
print(mydoubler(11))
Or, use the same function definition to make a function that always triples the number you send in:
def myfunc(n):
return lambda a : a * n
mytripler = myfunc(3)
print(mytripler(11))
Or, use the same function definition to make both functions, in the same program:
def myfunc(n):
return lambda a : a * n
mydoubler = myfunc(2)
mytripler = myfunc(3)
print(mydoubler(11))
print(mytripler(11))
Use lambda functions when an anonymous function is required for a short period of time.
Create a lambda function that takes one parameter (a
) and returns it.
x =