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Always use safe dictionary access patterns when handling potentially null or missing values. This prevents KeyError and AttributeError exceptions that can crash your application.

Key practices to follow:

1. Use .get() with default values when accessing dictionaries:

   # Instead of conf["properties"]["siteConfig"]
   # Use this pattern:
   conf.get("properties", {}).get("siteConfig")
   

2. Validate types before performing operations:

   # Before accessing nested attributes or methods:
   if isinstance(nic_bloc, dict) and nic_bloc.get('allow_ip_spoofing', [False])[0]:
       # Process nic_bloc
   

3. Use explicit checks for None vs. empty collections:

   # For dictionaries with empty values vs None
   if each["change"]["before"] is None:  # Check specifically for None
       each["change"]["before"] = {}
   

4. Handle deeply nested structures safely:

   # For complex nested access:
   inline_suppressions_by_cve = inline_suppressions.get("cves", {}).get("byCve", [])
   for cve_suppression in inline_suppressions_by_cve:
       cve_id = cve_suppression.get("cveId")
       if cve_id:
           cve_by_cve_map[cve_id] = cve_suppression
   

This pattern reduces bugs, improves code readability, and eliminates the need for multiple conditional checks.