how to select a single cell in a pandas dataframe

# how to select a single cell in a pandas dataframe

import pandas as pd

old = pd.DataFrame({'A' : [4,5], 'B' : [10,20], 'C' : ['cell wanted',50], 'D' : [-30,-50]})
var = old['C'].values[0]

print(var)

Here is what the above code is Doing:
1. Creating a DataFrame called old.
2. Creating a variable called var, and setting it equal to the first value in the column C of old.
3. Printing var.