算不了。数据帧pandas中的特定值

Question

我是数据分析的新手。我正在尝试使用python分析数据集。

1. 我想要数不。幸存栏中的1s
2. 否。男性，女性在性别专栏

PassengerId Survived Pclass Sex
0 1 0 3 male 1 2 1 1 female 2 3 1 3 male 3 4 1 1 female 4 5 0 3 male

我尝试了groupby（）但是给出了错误。

In[88] titanic_data.groupby('Survived') Out[88] <pandas.core.groupby.DataFrameGroupBy object at 0x000000000BFFE588>

请建议解决方案

Answer 1

使用value_counts：

public class MainActivity extends AppCompatActivity {

    ListView myList;
    Button getChoice;

    String[] listContent = {

            "January",
            "February",
            "March",
            "April",
            "May",
            "June",
            "July",
            "August",
            "September",
            "October",
            "November",
            "December"

    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        myList = (ListView)findViewById(R.id.list);
        getChoice = (Button)findViewById(R.id.getchoice);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, listContent);
        myList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        myList.setAdapter(adapter);

        getChoice.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String selected = "";
                int cntChoice = myList.getCount();

                SparseBooleanArray sparseBooleanArray = myList.getCheckedItemPositions();
                for(int i = 0; i < cntChoice; i++){
                    if(sparseBooleanArray.get(i)) {
                        selected += myList.getItemAtPosition(i).toString() + "\n";

                    }

                }

                Toast.makeText(MainActivity.this, selected, Toast.LENGTH_LONG).show();

            }
        });



    }
}