[Solved] You have a dictionary of responses with some missing 'completion_tokens' keys. How do you safely calculate total tokens without errors?... How do you safely calculate total tokens without errors? | Agentic AI

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You have a dictionary of responses with some missing 'completion_tokens' keys. How do you safely calculate total tokens without errors?

responses = [
  {'usage': {'prompt_tokens': 10, 'completion_tokens': 5}},
  {'usage': {'prompt_tokens': 20}},
  {'usage': {'prompt_tokens': 15, 'completion_tokens': 10}}
]
cost_per_token = 0.0003
# Fill in the blank:
total_tokens = sum(____)
total_cost = total_tokens * cost_per_token
print(f"Total cost: ${total_cost:.4f}")

Aresp['usage']['prompt_tokens'] + resp['usage']['completion_tokens'] for resp in responses

Bresp['usage'].get('prompt_tokens', 0) + resp['usage']['completion_tokens'] for resp in responses

Cresp['usage']['prompt_tokens'] + resp['usage'].get('completion_tokens', 0) for resp in responses

Dresp['usage'].get('total_tokens', 0) for resp in responses

Step-by-Step Solution

Solution:

Step 1: Use get() to handle missing keys
Use get('completion_tokens', 0) to avoid KeyError if key is missing.
Step 2: Sum prompt tokens plus safe completion tokens
Sum prompt_tokens plus completion_tokens or zero if missing.
Final Answer:
resp['usage']['prompt_tokens'] + resp['usage'].get('completion_tokens', 0) for resp in responses -> Option C
Quick Check:
Use get() for missing keys safely [OK]

Quick Trick: Use get() with default 0 for missing tokens [OK]

Common Mistakes:

Not handling missing keys
Assuming all keys exist
Using wrong default values

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You have a dictionary of responses with some missing 'completion_tokens' keys. How do you safely calculate total tokens without errors?

Step 1: Use get() to handle missing keys

Step 2: Sum prompt tokens plus safe completion tokens

Final Answer:

Quick Check:

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