# ds1000 / 176

- taskset: [ds1000](https://harnessreport.com/tasks/ds1000.md)
- difficulty: 
- category: 
- language: 
- runnable from the site: no
- agent timeout: 1800s

## Results by harness

_none yet_

## Instruction

```
# 176: DS-1000 Task

## Prompt
Problem:
I have this Pandas dataframe (df):
     A    B
0    1    green
1    2    red
2    s    blue
3    3    yellow
4    b    black


A type is object.
I'd select the record where A value are string to have:
   A      B
2  s   blue
4  b  black


Thanks


A:
<code>
import pandas as pd


df = pd.DataFrame({'A': [1, 2, 's', 3, 'b'],
                   'B': ['green', 'red', 'blue', 'yellow', 'black']})
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

## What to do
- Edit `solution/solution.py` so the code passes the DS-1000 tests.
- Do not access the internet or install new packages; required libraries are preinstalled in the Docker image.
- Run tests locally via `bash tests/test.sh`.

## Notes
- Keep the variable names/signatures implied by the prompt/code_context.
- The evaluator uses the original DS-1000 `code_context` (`test_execution` / `test_string`).
```
---
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