PYTHON-LAMBDA-expression

Tag: Lam class number length defines sum expression span TE

Lambda is used to define a function

Common functions:

def multiply (x, y):     return x * y

Use lambda to override the above functions:

Lambda x, y:x * y

The lambda function consists of three parts:

1. Lambda keyword

2. The parameter of the partition is the parameter in the normal function, followed by a :

3. Function body, which is the function body in normal function

Some chestnuts:

# calculates the average of the individual lists in the numbers list, and then returns them to a list numbers = [[The] " ["]. >63, Panax Notoginseng,],[, each, each, each, the list (map (lambda x:sum (x)/len (x), numbers))

Results: [57.0, 58.2, 50.6, 27.2]

 #   filter out cities with a city name less than 10  cities = [ " new York city  " ,  " los Angeles  " ,  " chicago  " ,  mountain View  Span style= "COLOR: #800000" > ", "  denver   ", "   Boston   " ]short_cities  = List ( Filter (lambda  x:len (x) < ten, cities) 

Result: ['Chicago'Denver'Boston ' ]

PYTHON-LAMBDA-expression