Missing Values in DataFrames | Dataford Interview Questions

Write code to calculate the number of missing values in a specific DataFrame column, and outline your strategy for handling those missing values.

For grading, represent the selected column as a Python list, using None for each missing value. Return the missing-value count, then explain when to remove, impute, or flag missing entries.

Constraints

0 <= len(column) <= 10^5
Each entry is either None or a valid non-missing value
None is the only representation of a missing value

Function Signature

def count_missing_values(column):

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Problem

Write code to calculate the number of missing values in a specific DataFrame column, and outline your strategy for handling those missing values.

For grading, represent the selected column as a Python list, using None for each missing value. Return the missing-value count, then explain when to remove, impute, or flag missing entries.

Constraints

0 <= len(column) <= 10^5
Each entry is either None or a valid non-missing value
None is the only representation of a missing value

Function Signature

def count_missing_values(column):

Your question is Missing Values in DataFrames. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.