我正在尝试在 Field1 ， Field2 中找到唯一值以及来自 Value1 ， Value2 <的相应值的总和/ strong>即可。
请在下面找到示例输入和输出。我尝试使用堆栈但无法获得类似的输出。
id Field1 Value1 Field2 Value2
1 A 1 B 0
1 A 0
2 A 1 D 1
3 C 1 A 0
4 E 0
3 A 1 C 1
4 F 1
id Field Value
1 A 1
1 B 0
2 A 1
2 D 1
3 C 2
3 A 1
4 E 0
4 F 1
如果列包含特定值以及其他值，我正在尝试删除行。
例如，在上面的输出中，我会删除带有 A，B 的行（如果它们与其他行一起出现），如果它们看起来是独立的，则会打印出来。请参阅下面的新输出
id Field Value
1 A 1
1 B 0
2 D 1
3 C 2
4 E 0
4 F 1
答案 0 :(得分：1)
将wide_to_long与public class MainActivity extends AppCompatActivity {
private BottomNavigationView bottomNavigationView;
private final String IS_FIRST_USE_FLAG = "IS_FIRST_USE_FLAG";
Semaphore waitUntiAccessTokenIsObtained = new Semaphore(0);
private static boolean isFirstUseFlagValue;
SharedPreferences prefs;
ClientCredentialsStore credentialsStore;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
prefs = this.getSharedPreferences("com.myapp", Context.MODE_PRIVATE);
handleFlags();
if(this.isFirstUseFlagValue){
registerClient();
getAccessToken();
try {
waitUntiAccessTokenIsObtained.acquire();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
setContentView(R.layout.main_screen);
bottomNavigationView = (BottomNavigationView) findViewById(R.id.navigation);
bottomNavigationView
.setOnNavigationItemSelectedListener
(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()) {
case R.id.action_item1:
selectedFragment = HomeFragment.newInstance();
break;
case R.id.action_item2:
selectedFragment = CathegoriesListFragment.newInstance();
break;
case R.id.action_item3:
selectedFragment = TestFragment.newInstance();
break;
case R.id.action_item4:
selectedFragment = ItemThreeFragment.newInstance();
break;
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_layout, selectedFragment);
transaction.commit();
return true;
}
});
//Manually displaying the first fragment - one time only
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_layout, HomeFragment.newInstance());
transaction.commit();
//Used to select an item programmatically
//bottomNavigationView.getMenu().getItem(1).setChecked(true);
}
private void handleFlags(){
this.isFirstUseFlagValue = prefs.getBoolean(this.IS_FIRST_USE_FLAG, true);
}
private void registerClient(){
// TODO client registration on server.
String clientNameValue = "clientId";
String clientPasswordValue ="clientSecret";
credentialsStore = new ClientCredentialsStore(getApplicationContext());
credentialsStore.save(clientNameValue, clientPasswordValue);
}
private void getAccessToken(){
// Obtain token from the server.
ClientCredentialsStore credentialsStore = new ClientCredentialsStore(getApplicationContext());
ClientCredentials credentials = credentialsStore.getCredentials();
Call<AccessToken> call = ClientAPI.oAuth2ClientCredentialsGrant(credentials).tokenClient(
ClientAccessTokenRequest.from());
call.enqueue(new Callback<AccessToken>() {
@Override
public void onResponse(Call<AccessToken> call, retrofit2.Response<AccessToken> response) {
AccessToken accessToken = response.body();
TokenStore store = new TokenStore(getApplicationContext());
store.save(accessToken);
waitUntiAccessTokenIsObtained.release();
waitUntiAccessTokenIsObtained.release();
}
@Override
public void onFailure(Call<AccessToken> call, Throwable t) {
Log.e("MainActivity", "could not retrieve access token", t);
}
});
}
}
一起使用并汇总groupby：
sum替代df = (pd.wide_to_long(df.reset_index(), stubnames=['Field', 'Value'], i='index', j='id')
.reset_index(drop=True)
.groupby(by=['id', 'Field'], as_index=False)['Value'].sum())
，但仍不在官方docs中：
lreshape