Question

我尝试安装Auto-SelfControl并在执行此命令时卡住：

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

它显示错误：

AttributeError：“ dict”对象没有属性“ has_key”

我正在寻找解决方案，最后将 has_key 替换为 in 运算符，但是由于我只了解python的基础知识，因此代码对我来说非常复杂。

在3个地方使用了 has_key ，您能帮我更改一下它以便可以在python3上运行吗？

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

尽管其他答案中的零散解决方案都行得通，但是该方法存在缺陷，原因仅在于它容易犯小错误，错过需要修复的地方等。更好的解决方案是仅使用the 2to3 converter 。您可以使用以下方法一次解决所有文件：

$ 2to3 -f has_key -w auto-selfcontrol.py

仅运行the has_key fixer，它会从dict.has_key(key)转换为key in dict。当然，您可以自己进行修复，但是在这种情况下，简单的程序化修复程序就可以正常工作。您可能只想在不使用-f has_key的情况下运行它，以便在Py2和Py3之间应用任何其他重大更改的情况下，一次应用所有修复程序。

2to3几乎可以自动处理所有内容，但Py2 str类型更改除外（这是由代码逻辑决定的，是否应将给定的str文字设为bytes或str（在Py3中）和整数除法（其中，/可能需要更改为//，具体取决于计算是逻辑浮点除法还是底数除法）。但是对于has_key，它是非常可靠的。

Answer 2

替换如下

1。

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

2-4。

def check_config(config):
""" checks whether the config file is correct """
if not "username" in config:
    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 "selfcontrol-path" in config:
    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 "block-schedules" in config:
    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 3

此解决方案的正式资源位于：https://portingguide.readthedocs.io/en/latest/dicts.html

TL; DR是这样的：

SELECT 
u.agent_number,
u.reporting_week
FROM table1 e
JOIN (
  SELECT 
   b.agent_number,
   b.reporting_week
   FROM table2 b
   GROUP BY b.agent_number
) u ON u.agent_number = e.agent_number

where DATE_FORMAT(date(u.reporting_week),'%Y-%m-%d %r') BETWEEN DATE_FORMAT(date('2019-01-01 00:00:00'),'%Y-%m-%d %r') AND DATE_FORMAT(date('2019-01-07 00:00:00'),'%Y-%m-%d %r');

现在是：

import React,{Component} from 'react';
import {Text, View, StyleSheet} from 'react-native';  

rotateByStyle = (percent, base_degrees, clockwise) => {
  let rotateBy = base_degrees;

  if(clockwise) {
    rotateBy = base_degrees + (percent * 3.6);
  } else {
    //anti clockwise progress
    rotateBy = base_degrees - (percent * 3.6);
  }

  return {
    transform:[{rotateZ: `${rotateBy}deg`}]
  };
}

renderThirdLayer = (percent, commonStyles, ringColorStyle, ringBgColorStyle, clockwise, bgRingWidth, progressRingWidth, innerRingStyle, startDegrees) => {
  let rotation = 45 + startDegrees;
  let offsetLayerRotation = -135 + startDegrees;

  if(!clockwise) {
    rotation += 180;
    offsetLayerRotation += 180;
  }

  if(percent > 50) {
    return <View style=    {[styles.secondProgressLayer,this.rotateByStyle((percent - 50), rotation, clockwise),
    commonStyles, ringColorStyle, {borderWidth: progressRingWidth}    ]}></View>
  } else {
    return <View 
             style={[styles.offsetLayer, innerRingStyle, ringBgColorStyle, {transform:[{rotateZ: `${offsetLayerRotation}deg`}], borderWidth: bgRingWidth}]}>
           </View>
    }
}

const CircularProgress = ({percent, radius, bgRingWidth, progressRingWidth, ringColor, ringBgColor, textFontSize, textFontWeight, clockwise, bgColor, startDegrees}) => {
  const commonStyles = {
    width: radius * 2,
    height: radius * 2,
    borderRadius: radius
  };
}

let firstProgressLayerStyle;
let displayThickOffsetLayer = false;

if(percent > 50){
  firstProgressLayerStyle = this.rotateByStyle(50, rotation, clockwise);
} else {
  firstProgressLayerStyle = this.rotateByStyle(percent, rotation, clockwise);
  if( progressRingWidth > bgRingWidth ) {
    displayThickOffsetLayer = true;
  }
}

let offsetLayerRotation = -135 + startDegrees;
if(!clockwise) {
  offsetLayerRotation += 180;
}


export default CircularProgress;

因此，在您的代码中：

some_dict.has_key('some key')

成为：

'some key' in some_dict

类似地，像这样的行：

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

变得像：

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

请注意，您也可以编写if not config.has_key("selfcontrol-path"): # do something，但是上面给出的示例被认为是更Python风格的，应该是首选。

Answer 4

在python3.7中测试。

        <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

如何在python3中替换has_key？

4 个答案: