gistfile1.py

# Tell - The de-coupling allows me to write the example without having to write an example of the Keychain class

class EncryptionKey:

    def __init__(self, keychain):
        self.keychain = keychain

    def decrypt(self, password):
        if _decrypt(password):
            self.keychain.unlock()

# Ask - The tight coupling causes strong dependencies

class Keychain:

    def unlock(self, password):
        try:
            decrypted_key = encrypted_key.decrypt(password)
            self.locked = False
        except:
            self.locked = True