Function basis - function object

Functions are first-class objects, i.e. function may be used as the data processing.

def func():
    print('from func')

print(func)

<function func at 0x10af72f28>

Dian four functions a function object

• Side of the function refers to the function name, the function name points to the function stored in the memory address
  1. references

x = 'hello nick'
y = x

f = func
print(f)

<function func at 0x10af72f28>
2. as a parameter passed to a function

len(x)

def foo(m):
    m()

foo(func)

from func
3. The return value can be used as a function of

def foo(x):
    return x


res = foo(func)
print(res)
res()

<function func at 0x10af72f28> from func
4. The types of elements can be used as a container

l = [x]

function_list = [func]
function_list[0]()

from func