python - 在其他函数中重新定义python函数

Question

我可以弄清楚python的行为。这是代码示例:

def foo():
    print('hello from initial foo')
def using_foo():
    foo()
def wrapper(func):
    def foo():
        print('Now is overload foo')
    print('Hello from wrapper')
    func()
using_foo()
wrapper(using_foo)

这将打印:

hello from initial foo

Hello from wrapper

hello from initial foo

但我期望:

hello from initial foo

Hello from wrapper

Now is overload foo

因为下一个工作正常:

def foo():                                                                         
    print('Hello from initial foo')                                                
def using_foo():                                                                   
    foo()                                                                          
using_foo()                                                                        
if True:                                                                           
    def foo():                                                                     
        print('now it is overload foo')                                            
    using_foo()

输出:

Hello from initial foo

now it is overload foo

Answer 1

您只是错误地输入了 func() 而不是 foo():

def foo():
    print('hello from initial foo')
def using_foo():
    foo()
def wrapper(func):
    def foo():
        print('Now is overload foo')
    print('Hello from wrapper')
    foo()
using_foo()
wrapper(using_foo)

输出:

hello from initial foo
Hello from wrapper
Now is overload foo