依赖注入框架在动态类型语言中几乎没有那么有用。例如，请参见Java中的表示Dependency Injection: Vitally important or totally irrelevant?依赖注入框架提供的灵活性是至关重要的，而在Python中，这通常会导致不必要的复杂性。

这并不意味着原则是错误的。请参阅以下示例如何使用简单的习惯用法实现类之间的松散耦合：# A concrete class implementing the greeting provider interface

class EnglishGreetingProvider(object):

def get_greeting(self, who):

return "Hello %s!" % who

# A class that takes a greeting provider factory as a parameter

class ConsoleGreeter(object):

def __init__(self, who, provider=EnglishGreetingProvider):

self.who = who

self.provider = provider()

def greet(self):

print(self.provider.get_greeting(self.who))

# Default wiring

greeter = ConsoleGreeter(who="World")

greeter.greet()

# Alternative implementation

class FrenchGreetingProvider(object):

def get_greeting(self, who):

return "Bonjour %s!" % who

greeter = ConsoleGreeter(who="World", provider=FrenchGreetingProvider)

greeter.greet()