Getting false even when data exists

[perfringo]

Hmm.... 'Is not working'....

"… There's no more work. We're destitute. I'm afraid I have no choice but to sell you all for scientific experiments."

–The Meaning of Life

One should be specific while looking for help. I for example don't understand the problem/question. I have no idea how data from csv is read into dataframe etc. Therefore I repeat my earlier answer with some additional lines:

>>> df = pd.DataFrame(range(1, 4))
>>> df
   0
0  1
1  2
2  3
>>> from_user = input('Enter integer: ')
Enter integer: 1
>>> from_user in df[0]
False
>>> from_user = int(input('Enter integer: '))
Enter integer: 1
>>> from_user in df[0]
True