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What does print(s[s > 3].tolist()) print? pandas Series, Index and dtypes
Block 1, Series, Index and dtypes, question 3 of the pandas sample
import pandas as pd
s = pd.Series([1, 2, 3, 4, 5])
print(s[s > 3].tolist())What does this print?
Show the answer and why each option is right or wrong
Answer, A. [4, 5]
- A. [4, 5]
- Correct. s > 3 builds a boolean mask that is True only where the value exceeds 3, and indexing the Series with that mask keeps only those matching rows, 4 and 5.
- B. [3, 4, 5]
- Includes 3 as if the comparison were greater than or equal to 3 rather than strictly greater than.
- C. [True, True]
- Prints the boolean mask itself instead of the values it selects.
- D. [1, 2, 3]
- Keeps the rows that fail the condition instead of the ones that pass it.
Indexing a Series with a boolean Series of the same length filters it down to the positions where the mask is True. The comparison itself is strictly greater than, so a value equal to the threshold is excluded, not kept.
The answer above is what pandas 3.0.5 printed when the snippet was run, not what someone expected it to do.
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