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import pandas as pd
import numpy as np
np.random.seed(0)
df = pd.DataFrame(np.random.randn(3, 2), columns=['Foo', 'Bar'], index=np.random.randint(1,100,10)).sort_index()
print(df)
Foo Bar
10 1.7641 0.4002
24 0.1440 1.4543
29 0.3131 -0.8541
row = 0
col = "Bar"
df.iloc[row, df.columns.get_loc(col)] = 100
print(df)
Foo Bar
10 1.7641 100.0000
24 0.1440 1.4543
29 0.3131 -0.8541