freeCodeCamp/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-course/pandas-conditional-selection-and-modifying-dataframes.md

---
id: 5e9a093a74c4063ca6f7c15b
challengeType: 11
videoId: BFlH0fN5xRQ
dashedName: pandas-conditional-selection-and-modifying-dataframes
---

# --description--

More resources:

\- [Notebook](https://notebooks.ai/rmotr-curriculum/freecodecamp-intro-to-pandas-902ae59b)

# --question--

## --text--

What will the following code print out?

```py
import pandas as pd

certificates_earned = pd.DataFrame({
    'Certificates': [8, 2, 5, 6],
    'Time (in months)': [16, 5, 9, 12]
})
names = ['Tom', 'Kris', 'Ahmad', 'Beau']

certificates_earned.index = names
longest_streak = pd.Series([13, 11, 9, 7], index=names)
certificates_earned['Longest streak'] = longest_streak

print(certificates_earned)
```

## --answers--

```
Tom      13
Kris     11
Ahmad     9
Beau      7
Name: Longest streak, dtype: int64
```

---

```
      Certificates  Time (in months)  Longest streak
Tom               8                16              13
Kris              2                 5              11
Ahmad             5                 9               9
Beau              6                12               7
```

---

```
      Certificates   Longest streak
Tom               8               13
Kris              2               11
Ahmad             5                9
Beau              6                7
```

## --video-solution--

2