Python Pandas Questions et reponses d'entretien
Question 46. Explain the purpose of the stack() and unstack() functions in Pandas.
stack() is used to pivot the columns of a DataFrame to the rows. unstack() does the reverse operation.
Example:
df.stack()
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Question 47. What is the purpose of the to_excel() function in Pandas?
to_excel() is used to write a DataFrame to an Excel file.
Example:
df.to_excel('output.xlsx', index=False)
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Question 48. How do you calculate the correlation matrix for a Pandas DataFrame?
Use the corr() function. df.corr()
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