A step-by-step guide to using the Claude API in Python via the official `anthropic` SDK. Covers installing the package, authenticating with an API key, sending prompts with `client.messages.create()`, controlling behavior with system prompts, and returning structured JSON output using either a handwritten JSON schema or Pydantic models with `client.messages.parse()`. Also includes common errors, security reminders, and cost awareness tips.
Table of contents
PrerequisitesStep 1: Set Up the Claude API in PythonStep 2: Control Claude’s Behavior With a System PromptStep 3: Return Structured JSON Output With a SchemaTroubleshooting and Next StepsFrequently Asked Questions191 Impressions