How do you handle missing data?

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Handling missing data is a crucial step in data cleaning and analysis. In Pandas, there are several methods to detect, remove, or fill missing values efficiently.

1. Detecting Missing Data

Use isnull() or isna():

df.isnull()

df.isnull().sum()  # Count missing values per column

2. Removing Missing Data

Drop rows with missing values:

df.dropna()

Drop columns with missing values:

df.dropna(axis=1)

3. Filling Missing Data

Fill with a specific value:

df.fillna(0)

Fill with the mean, median, or mode:

df['column'].fillna(df['column'].mean())

Forward fill or backward fill:

df.fillna(method='ffill')  # forward

df.fillna(method='bfill')  # backward

4. Replace with Interpolation

df.interpolate()

5. Check for All Missing Rows/Columns

df.dropna(how='all')

Summary:

Pandas provides powerful tools like isnull(), dropna(), fillna(), and interpolate() to handle missing data. Choose the method based on your data and analysis goals—either drop, fill, or impute values to maintain data quality.

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