[当我尝试检索属性的值并包含参数时，出现“对象不可调用”的错误消息。
[获得值时，我想有选择地将“ refresh”指定为True，以强制从主机中重新获取该值，而不是使用存储在变量中的值。例如，如果我说a = x.host_name(refresh=True)，我希望从主机中检索主机名，而不是从变量_host_name中提取主机名。
#!/usr/local/bin/python3.7
import netaddr
"""
test.py - Used for testing
"""
class Host():
"""
Represents a Host device
Attributes:
host_name: str
Name of host
manage_address: IP
Managment IP address of the host
"""
def __init__(self, host_name="", manage_address=netaddr.IPAddress("0.0.0.0")):
"""
The constructor for the Host class.
Parameters:
host_name: str
Host name of the host
manage_address: ip
Management IP address of this host
"""
self._host_name = host_name
self._manage_address = manage_address
@property
def host_name(self, refresh=False):
"""
The host name configured for this host device
Paramters:
refresh: bool
Should we relearn the hostname if we already know it?
Returns: str
Host name defined on the host
"""
if refresh:
# TODO: Get hostname from the host
pass
return self._host_name
@host_name.setter
def host_name(self, host_name):
"""
Set the host name of the host
Parameters
host_name: str
The host name to configure on the host
Returns: None
"""
self._host_name = host_name
@property
def manage_address(self, refresh=False):
"""
The IP address to manage the host
Paramters:
refresh: bool
Should we relearn the IP address if we already know it?
Returns: IP
Management IP address of the host
"""
if refresh:
# TODO: Get management IP address from the host
pass
return self._manage_address
@manage_address.setter
def manage_address(self, manage_address):
"""
Set the management IP address of the host
Parameters
manage_address: IP
The management IP address of the host
Returns: None
"""
self._manage_address = manage_address
if __name__ == '__main__':
# A host object
h = Host()
h.host_name = "myhost.com"
print(h.host_name) # Works
print(h.host_name(refresh=True)) # str object is not callable error
print((str(h.manage_address(refresh=True)))) # IPAddress object is not callable error
我的猜测是，从属性获取值时不允许传递参数...但是，在这种情况下，如何有条件地获取值？
这是我想出的解决方案：
#!/usr/local/bin/python3.7
import netaddr
"""
test.py - Used for testing
"""
class Host():
"""
Represents a Host device
Attributes:
host_name: str
Name of host
manage_address: IP
Managment IP address of the host
"""
def __init__(self, host_name=None, manage_address=None):
"""
The constructor for the Host class.
Parameters:
host_name: str
Host name of the host
manage_address: ip
Management IP address of this host
"""
self._host_name = host_name
self._manage_address = manage_address
def host_name(self, refresh=False, host_name=None):
"""
Sets and returns the host name of the host
Parameters:
refresh: bool
Should we learn the value from the host even though we already know it?
host_name: str
Host name of the host
Returns: str
The host name of the host
"""
if host_name is not None:
self._host_name = host_name
elif refresh or self._host_name is None:
# TODO: Get hostname from host
self._host_name = "thehost.com" # Temporary
return self._host_name
def manage_address(self, refresh=False, manage_address=None):
if manage_address is not None:
self._manage_address = manage_address
elif refresh or self._manage_address is None:
# TODO: Get management IP address from the host
self._manage_address = netaddr.IPAddress("127.0.0.1") # Temporary
return self._manage_address
if __name__ == '__main__':
# A host object
h = Host()
h.host_name(host_name="myhost.com")
print(h.host_name()) # Works
print(h.host_name(refresh=True))
print(h.manage_address(refresh=True))