[ Python 常見問題 ] Pandas - Set value for particular cell in pandas DataFrame using index

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Question
I've created a Pandas DataFrame

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1. import pandas as pd  
2.   
3. df = pd.DataFrame(index=['A','B','C'], columns=['x','y'])  
4. df  

Output:

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1.     x    y  
2. A  NaN  NaN  
3. B  NaN  NaN  
4. C  NaN  NaN  

Then I want to assign value to particular cell, for example for row 'C' and column 'x'. I've expected to get such result:Any suggestions?

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1.     x    y  
2. A  NaN  NaN  
3. B  NaN  NaN  
4. C  10  NaN  

Any suggestions?

HowTo
Going forward, the recommended method is .iat/.at. So the recommended approach is: