Question

我正在尝试制作一本简单的电话簿，如果您输入 1：如果将联系人添加到词典中，如果 2您根据输入的名称（键）查找字典，如果 3您根据输入的数字（值）查找字典

当我基于值（输入3）运行键查找时，无论是否为真，它都会返回else函数“ this is invalid”。

有人可以解密吗？

    #Input contact name
    if button == 1:
        name = input('Please enter the contact name:') 
        if name in contacts:
            print("The name you entered already exists in the address book --> %s:%s"\
            %(name,contacts[name]))
            flag = input("Whether to modify user information (YES/NO):")
            if  flag== 'YES':  
                tel = input('Please enter the users contact phone number:') 
                contacts.update({name:tel}) #Update dictionary
                print("Contacts have been updated!")
            else:
                continue
        else:
            contacts[name] =  input('Please enter the contact phone number:')
            print("Contact has been saved!")
    
    #Search by contact name
    if button == 2:
        name = input('Please enter the contact name:') 
        if name in contacts:
            print("%s : %s "%(name,contacts[name]))
        else:
            print('The name you entered is no longer in the address book! ') 
   
            
   #Search by contact number
    if button == 3:
        numba = input('Please enter the contact number:') 
        lookup = []
        for key,value in contacts.items():
            if(value == numba):
                lookup.append(key)
                print('Name(s) matching number is',lookup)
            else:
                print('This is invalid')

Answer 1

尝试一下：

class EditUserProfile extends StatefulWidget {
  static String id = 'edit-profile';
  @override
  _EditUserProfileState createState() => _EditUserProfileState();
}

enum Gender { male, female }

class _EditUserProfileState extends State<EditUserProfile> {
  Gender _gender = Gender.male;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.white,
        iconTheme: IconThemeData(color: Colors.black),
        title: Text(
          "Edit Profile",
          style: TextStyle(color: Colors.black),
        ),
        actions: [
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: RaisedButton(
              onPressed: null,
              child: Text('Done'),
            ),
          )
        ],
      ),
      body: ListView(
        children: [
          InputField(
            icon: Icon(
              Icons.person,
              color: Colors.white,
            ),
            showText: true,
            labelText: 'Nickname',
            hintText: 'What do they call you?',
          ),
          SizedBox(
            height: 10,
          ),
          InputField(
            icon: Icon(
              Icons.phone_in_talk,
              color: Colors.white,
            ),
            showText: true,
            labelText: 'Mobile Number',
            hintText: 'How can people reach your cell?',
          ),
          SizedBox(
            height: 10,
          ),
          InputField(
            icon: Icon(
              FontAwesomeIcons.child,
              color: Colors.white,
            ),
            showText: true,
            labelText: 'Age',
            hintText: 'How old are you?',
          ),
          SizedBox(
            height: 10,
          ),
          InputField(
            icon: Icon(
              Icons.person,
              color: Colors.white,
            ),
            showText: true,
            labelText: 'Gender',
            hintText: 'Are you single or married?',
          ),
          SizedBox(
            height: 10,
          ),
          IntrinsicHeight(
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Flexible(
                  child: RadioListTile<Gender>(
                    title: Text('Male'),
                    value: Gender.male,
                    groupValue: _gender,
                    onChanged: (Gender value) {
                      setState(() {
                        _gender = value;
                      });
                    },
                  ),
                ),
                Flexible(
                  child: RadioListTile<Gender>(
                    title: Text('Female'),
                    value: Gender.female,
                    groupValue: _gender,
                    onChanged: (Gender value) {
                      setState(() {
                        _gender = value;
                      });
                    },
                  ),
                ),
              ],
            ),
          ),
          InputField(
            icon: Icon(
              FontAwesomeIcons.locationArrow,
              color: Colors.white,
            ),
            showText: true,
            labelText: 'Lives In',
            hintText: 'Where do you reside',
          ),
          SizedBox(
            height: 10,
          ),
          InputField(
            icon: Icon(
              Icons.person,
              color: Colors.white,
            ),
            showText: true,
            labelText: 'Relationship Status',
            hintText: 'Are you single or married?',
          ),
          SizedBox(
            height: 10,
          ),
        ],
      ),
    );
  }
}

Answer 2

可能有点麻烦，但是我做到了：

numba = input('Please enter the contact number: ')
lookup = []
for key,value in contacts.items():
    if(numba == key):
        lookup.append(value)
        print('Name(s) matching number is', lookup)

if(int(numba) > len(contacts.items())):
    print('This is invalid')

简单的电话簿查找else函数即使语句为true也会运行

2 个答案: