def func(df): return ','.join(df.values)

As an AI language model, I do not have access to the context or information related to this code snippet. However, based on the syntax, it appears to be a Python function that takes a pandas DataFrame as an input and returns a string that concatenates all the values in the DataFrame separated by commas.

Here's an example of how this function could be used:

import pandas as pd

# create a sample DataFrame
data = {'Name': ['John', 'Mary', 'Peter'], 'Age': [25, 30, 35]}
df = pd.DataFrame(data)

# apply the function to the DataFrame
result = func(df)

print(result)
# Output: 'John,25\nMary,30\nPeter,35'

Note that the values in the resulting string are separated by both commas and newline characters, as the `join` function is used to concatenate the rows of the DataFrame.