Python Data Cleaning Techniques

Data cleaning is often the most time-consuming part of data analysis. This article explores practical techniques for cleaning data using Python and Pandas.

Common Data Quality Issues

  • Missing values
  • Duplicate records
  • Inconsistent formatting
  • Outliers
  • Incorrect data types

Handling Missing Values

Detection

df.isnull().sum()
df.info()

Treatment Options

  • Remove missing values
  • Imputation (mean, median, mode)
  • Forward/backward fill
  • Interpolation

Removing Duplicates

df.drop_duplicates(subset=['column_name'], keep='first')

Data Type Conversion

df['date_column'] = pd.to_datetime(df['date_column'])
df['numeric_column'] = pd.to_numeric(df['numeric_column'], errors='coerce')

Conclusion

Clean data is the foundation of reliable analysis. Invest time in proper data cleaning to ensure accurate insights.




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