How to save a long number to the csv file?
**Code**

```python
import pandas as pd

df = pd.DataFrame(["3100000035155588379531799826432", "3100000035155588433002733375488", "3100000035155588355694446120960"])
df.to_csv("data.csv")
```

**The following display is opened using Excel, Show in Excel is wrong.**

**Result**

  | 0
-- | --
0 | 3.10E+30
1 | 3.1E+30
2 | 3.1E+30

**Expect**

  | 0
-- | --
0 | 3100000035155588379531799826432
1 | 3100000035155588433002733375488
2 | 3100000035155588355694446120960

**How to save long numbers to CSV file, use the string type save?**