Example
.iloc uses integers to read and write data to a DataFrame.
First, let's create a DataFrame:
df = pd.DataFrame({'one': [1, 2, 3, 4, 5],
'two': [6, 7, 8, 9, 10],
}, index=['a', 'b', 'c', 'd', 'e'])
This DataFrame looks like:
one two
a 1 6
b 2 7
c 3 8
d 4 9
e 5 10
Now we can use .iloc to read and write values. Let's read the first row, first column:
print df.iloc[0, 0]
This will print out:
1
We can also set values. Lets set the second column, second row to something new:
df.iloc[1, 1] = '21'
And then have a look to see what happened:
print df
one two
a 1 6
b 2 21
c 3 8
d 4 9
e 5 10
