# Convert a string with numbers into a list of integers using Python

## Question:

I’ve a dataframe column with an string of numbers and I want to convert it into a list of numbers. The output must be a list, since I need be able to pull the index value (for instance, df.probabilities[0][0] and return 0.001).

This my current dataframe:

```
probabilities
0.001, 0.002, 0.003, 0.004
```

I need this:

```
probabilities
[0.001, 0.002, 0.003, 0.004]
```

Thank you in advance.

## Answers:

You can call str.split and `float`

using a list comprehension in `DataFrame.apply`

:

```
import pandas as pd
def parse_probabilities(string):
return [float(value) for value in string.split(',')]
df = pd.DataFrame({'probabilities': ['0.001, 0.002, 0.003, 0.004']})
df['probabilities'] = df['probabilities'].apply(parse_probabilities)
print(df)
print(df.probabilities[0][0])
```

Uses .str accessor with split:

```
df['probabilities'].str.split(',s?')
```

```
df = pd.DataFrame({'probabilities': ['0.001, 0.002, 0.003, 0.004', '0.005, 0.006, 0.007, 0.008']})
df.probabilities = df.probabilities.str.split(',', expand=True).astype(float).apply(list, axis=1)
print(df, df.probabilities[0][0], sep='n')
```

```
probabilities
0 [0.001, 0.002, 0.003, 0.004]
1 [0.005, 0.006, 0.007, 0.008]
0.001
```