python - 如何替换python3中的has_key？

Question

我尝试安装Auto-SelfControl执行此命令时卡住了:

sudo /usr/bin/python auto-selfcontrol.py

它显示错误:

AttributeError: 'dict' object has no attribute 'has_key'

我正在寻找解决方案，最终将 has_key 替换为 in 运算符，但由于我只了解 python 的基础知识，因此代码对我来说相当复杂。

有 3 个地方使用了 has_key，你能帮我更改它以便我可以使用 python3 运行吗？

1.

def check_if_running(username):
""" checks if self-control is already running. """
defaults = get_selfcontrol_settings(username)
return defaults.has_key("BlockStartedDate") and not NSDate.distantFuture().isEqualToDate_(defaults["BlockStartedDate"])

2-4。

def check_config(config):
""" checks whether the config file is correct """
if not config.has_key("username"):
    exit_with_error("No username specified in config.")
if config["username"] not in get_osx_usernames():
    exit_with_error(
            "Username '{username}' unknown.\nPlease use your OSX username instead.\n" \
            "If you have trouble finding it, just enter the command 'whoami'\n" \
            "in your terminal.".format(
                    username=config["username"]))
if not config.has_key("selfcontrol-path"):
    exit_with_error("The setting 'selfcontrol-path' is required and must point to the location of SelfControl.")
if not os.path.exists(config["selfcontrol-path"]):
    exit_with_error(
            "The setting 'selfcontrol-path' does not point to the correct location of SelfControl. " \
            "Please make sure to use an absolute path and include the '.app' extension, " \
            "e.g. /Applications/SelfControl.app")
if not config.has_key("block-schedules"):
    exit_with_error("The setting 'block-schedules' is required.")
if len(config["block-schedules"]) == 0:
    exit_with_error("You need at least one schedule in 'block-schedules'.")
if config.get("host-blacklist", None) is None:
    print("WARNING:")
    msg = "It is not recommended to directly use SelfControl's blacklist. Please use the 'host-blacklist' " \
          "setting instead."
    print(msg)
    syslog.syslog(syslog.LOG_WARNING, msg)

Answer 1

解决方案的正式来源在这里:https://portingguide.readthedocs.io/en/latest/dicts.html

TL;DR 是这样的:

some_dict.has_key('some key')

现在是:

'some key' in some_dict

所以，在你的代码中:

return defaults.has_key("BlockStartedDate") and not NSDate.distantFuture().isEqualToDate_(defaults["BlockStartedDate"])

变成:

return "BlockStartedDate" in defaults and not NSDate.distantFuture().isEqualToDate_(defaults["BlockStartedDate"])

类似地，类似这样的行:

if not config.has_key("selfcontrol-path"):
    # do something

变得像:

if "selfcontrol-path" not in config:
    # do something

请注意，您也可以在配置中编写if not "selfcontrol-path":，但上面给出的示例被认为更Pythonic，应该是首选。