Python Lambda & Functional Programming

Python Lambda & Functional Programming

函数式编程

匿名函数

纯函数

高阶函数

# higher-order functions

def apply_twice(func, arg):
   return func(func(arg))

def add_five(x):
   return x + 5

print(apply_twice(add_five, 10))

# Pure function

def pure_function(x, y):
  temp = x + 2*y
  return temp / (2*x + y)

# Impure function

some_list = []
def impure(arg):
  some_list.append(arg)

#named function
def polynomial(x):
    return x**2 + 5*x + 4
print(polynomial(-4))

#lambda
print((lambda x: x**2 + 5*x + 4) (-4))

double = lambda x: x * 2
print(double(7))

Decorators

装饰器

def decor(func):
  def wrap():
    print("============")
    func()
    print("============")
  return wrap

def print_text():
  print("Hello world!")

decorated = decor(print_text)
decorated()

print_text = decor(print_text)
print_text()

https://code.sololearn.com/391/#py

refs

https://www.sololearn.com/Play/Python/

https://repl.it/languages/python3

https://repl.it/languages/python

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