Python Refactoring and Code Quality

9.

Database and External System Refactoring

9.1.

Database Schema Refactoring

9.1.1.

Schema Migration Strategies

9.1.1.1.

Version Control for Database Changes

9.1.1.2.

Backward Compatibility Maintenance

9.1.2.

Data Access Layer Refactoring

9.1.2.1.

Repository Pattern Implementation

9.1.2.2.

ORM Usage Optimization

9.1.2.3.

Query Optimization

9.2.

API and External Service Integration

9.2.1.

API Client Refactoring

9.2.1.1.

Error Handling Improvement

9.2.1.2.

Retry Logic Implementation

9.2.2.

Service Abstraction

9.2.2.1.

Creating Service Interfaces

9.2.2.2.

Mock Service Implementation

9.3.

Configuration Management

9.3.1.

Externalized Configuration

9.3.1.1.

Environment-Specific Settings

9.3.1.2.

Configuration Validation

9.3.2.

Feature Flag Implementation

9.3.2.1.

Gradual Feature Rollout

9.3.2.2.

A/B Testing Support

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8. Advanced Refactoring Strategies

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10. Establishing Refactoring Culture and Practices