From bcf7bfdf5526d794995721fe7d6bb4269326dd53 Mon Sep 17 00:00:00 2001
From: Nuno Bispo <nuno.m.bispo@gmail.com>
Date: Thu, 26 Mar 2026 09:06:20 +0100
Subject: [PATCH 1/4] added materials for How to Use the Claude API in Python
 for AI-Powered Applications

---
 .../basic_claude_call.py                      | 13 +++++++
 .../coding_assistant.py                       | 22 +++++++++++
 .../requirements.txt                          |  2 +
 .../structured_output_1.py                    | 38 +++++++++++++++++++
 .../structured_output_2.py                    | 31 +++++++++++++++
 5 files changed, 106 insertions(+)
 create mode 100644 how-to-use-claude-api-in-python/basic_claude_call.py
 create mode 100644 how-to-use-claude-api-in-python/coding_assistant.py
 create mode 100644 how-to-use-claude-api-in-python/requirements.txt
 create mode 100644 how-to-use-claude-api-in-python/structured_output_1.py
 create mode 100644 how-to-use-claude-api-in-python/structured_output_2.py

diff --git a/how-to-use-claude-api-in-python/basic_claude_call.py b/how-to-use-claude-api-in-python/basic_claude_call.py
new file mode 100644
index 0000000000..41ef584a83
--- /dev/null
+++ b/how-to-use-claude-api-in-python/basic_claude_call.py
@@ -0,0 +1,13 @@
+import anthropic
+
+client = anthropic.Anthropic()
+
+response = client.messages.create(
+    model="claude-sonnet-4-5",
+    max_tokens=1024,
+    messages=[
+        {"role": "user", "content": "What is the Zen of Python?"}
+    ],
+)
+
+print(response.content[0].text)
diff --git a/how-to-use-claude-api-in-python/coding_assistant.py b/how-to-use-claude-api-in-python/coding_assistant.py
new file mode 100644
index 0000000000..4baf89f445
--- /dev/null
+++ b/how-to-use-claude-api-in-python/coding_assistant.py
@@ -0,0 +1,22 @@
+import anthropic
+
+client = anthropic.Anthropic()
+
+system_prompt = """
+You are a Python coding assistant. You only answer questions about Python.
+If the user asks about any other programming language or unrelated topic,
+politely explain that you can only help with Python questions.
+"""
+
+user_input = input("Ask me anything about Python: ")
+
+response = client.messages.create(
+    model="claude-sonnet-4-5",
+    max_tokens=1024,
+    system=system_prompt,
+    messages=[
+        {"role": "user", "content": user_input}
+    ],
+)
+
+print(f"\n{response.content[0].text}")
diff --git a/how-to-use-claude-api-in-python/requirements.txt b/how-to-use-claude-api-in-python/requirements.txt
new file mode 100644
index 0000000000..8ba2115811
--- /dev/null
+++ b/how-to-use-claude-api-in-python/requirements.txt
@@ -0,0 +1,2 @@
+anthropic
+pydantic
\ No newline at end of file
diff --git a/how-to-use-claude-api-in-python/structured_output_1.py b/how-to-use-claude-api-in-python/structured_output_1.py
new file mode 100644
index 0000000000..17c7671cd7
--- /dev/null
+++ b/how-to-use-claude-api-in-python/structured_output_1.py
@@ -0,0 +1,38 @@
+import anthropic
+import json
+
+client = anthropic.Anthropic()
+
+response = client.messages.create(
+    model="claude-sonnet-4-5",
+    max_tokens=1024,
+    system="You are a Python coding assistant.",
+    messages=[
+        {
+            "role": "user",
+            "content": "Write a Python function that adds two numbers.",
+        }
+    ],
+    output_config={
+        "format": {
+            "type": "json_schema",
+            "schema": {
+                "type": "object",
+                "properties": {
+                    "function_name": {"type": "string"},
+                    "code": {"type": "string"},
+                    "explanation": {"type": "string"},
+                },
+                "required": ["function_name", "code", "explanation"],
+                "additionalProperties": False,
+            },
+        }
+    },
+)
+
+result = json.loads(response.content[0].text)
+
+print("--- Approach 1: Hand-written JSON schema ---")
+print(f"Function: {result['function_name']}")
+print(f"\nCode:\n{result['code']}")
+print(f"\nExplanation: {result['explanation']}")
\ No newline at end of file
diff --git a/how-to-use-claude-api-in-python/structured_output_2.py b/how-to-use-claude-api-in-python/structured_output_2.py
new file mode 100644
index 0000000000..f72ae9fc54
--- /dev/null
+++ b/how-to-use-claude-api-in-python/structured_output_2.py
@@ -0,0 +1,31 @@
+import anthropic
+
+from pydantic import BaseModel
+
+
+class FunctionDescription(BaseModel):
+    function_name: str
+    code: str
+    explanation: str
+
+client = anthropic.Anthropic()
+
+response = client.messages.parse(
+    model="claude-sonnet-4-5",
+    max_tokens=1024,
+    system="You are a Python coding assistant.",
+    messages=[
+        {
+            "role": "user",
+            "content": "Write a Python function that adds two numbers.",
+        }
+    ],
+    output_format=FunctionDescription,
+)
+
+result = response.parsed_output
+
+print("--- Approach 2: Pydantic + client.messages.parse() ---")
+print(f"Function: {result.function_name}")
+print(f"\nCode:\n{result.code}")
+print(f"\nExplanation: {result.explanation}")

From 3990d5c073e1852c407d98108ba4f99219e2e55a Mon Sep 17 00:00:00 2001
From: Nuno Bispo <nuno.m.bispo@gmail.com>
Date: Thu, 2 Apr 2026 10:00:07 +0200
Subject: [PATCH 2/4] Updated code after first TR

---
 how-to-use-claude-api-in-python/basic_claude_call.py   | 2 +-
 how-to-use-claude-api-in-python/coding_assistant.py    | 2 +-
 how-to-use-claude-api-in-python/structured_output_1.py | 2 +-
 how-to-use-claude-api-in-python/structured_output_2.py | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/how-to-use-claude-api-in-python/basic_claude_call.py b/how-to-use-claude-api-in-python/basic_claude_call.py
index 41ef584a83..2a7776a533 100644
--- a/how-to-use-claude-api-in-python/basic_claude_call.py
+++ b/how-to-use-claude-api-in-python/basic_claude_call.py
@@ -3,7 +3,7 @@
 client = anthropic.Anthropic()
 
 response = client.messages.create(
-    model="claude-sonnet-4-5",
+    model="claude-sonnet-4-6",
     max_tokens=1024,
     messages=[
         {"role": "user", "content": "What is the Zen of Python?"}
diff --git a/how-to-use-claude-api-in-python/coding_assistant.py b/how-to-use-claude-api-in-python/coding_assistant.py
index 4baf89f445..776e24bddf 100644
--- a/how-to-use-claude-api-in-python/coding_assistant.py
+++ b/how-to-use-claude-api-in-python/coding_assistant.py
@@ -11,7 +11,7 @@
 user_input = input("Ask me anything about Python: ")
 
 response = client.messages.create(
-    model="claude-sonnet-4-5",
+    model="claude-sonnet-4-6",
     max_tokens=1024,
     system=system_prompt,
     messages=[
diff --git a/how-to-use-claude-api-in-python/structured_output_1.py b/how-to-use-claude-api-in-python/structured_output_1.py
index 17c7671cd7..8734f96b1e 100644
--- a/how-to-use-claude-api-in-python/structured_output_1.py
+++ b/how-to-use-claude-api-in-python/structured_output_1.py
@@ -4,7 +4,7 @@
 client = anthropic.Anthropic()
 
 response = client.messages.create(
-    model="claude-sonnet-4-5",
+    model="claude-sonnet-4-6",
     max_tokens=1024,
     system="You are a Python coding assistant.",
     messages=[
diff --git a/how-to-use-claude-api-in-python/structured_output_2.py b/how-to-use-claude-api-in-python/structured_output_2.py
index f72ae9fc54..742a32500a 100644
--- a/how-to-use-claude-api-in-python/structured_output_2.py
+++ b/how-to-use-claude-api-in-python/structured_output_2.py
@@ -11,7 +11,7 @@ class FunctionDescription(BaseModel):
 client = anthropic.Anthropic()
 
 response = client.messages.parse(
-    model="claude-sonnet-4-5",
+    model="claude-sonnet-4-6",
     max_tokens=1024,
     system="You are a Python coding assistant.",
     messages=[

From 0408af453c2ba77f17f75c80c00fb8b6422d3fae Mon Sep 17 00:00:00 2001
From: Philipp Acsany <68116180+acsany@users.noreply.github.com>
Date: Fri, 17 Apr 2026 22:42:25 +0200
Subject: [PATCH 3/4] Apply ruff format to fix Linux314 CI

Pure formatter changes; no behavior change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 how-to-use-claude-api-in-python/basic_claude_call.py   | 4 +---
 how-to-use-claude-api-in-python/coding_assistant.py    | 4 +---
 how-to-use-claude-api-in-python/structured_output_1.py | 2 +-
 how-to-use-claude-api-in-python/structured_output_2.py | 1 +
 4 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/how-to-use-claude-api-in-python/basic_claude_call.py b/how-to-use-claude-api-in-python/basic_claude_call.py
index 2a7776a533..59a3f3f417 100644
--- a/how-to-use-claude-api-in-python/basic_claude_call.py
+++ b/how-to-use-claude-api-in-python/basic_claude_call.py
@@ -5,9 +5,7 @@
 response = client.messages.create(
     model="claude-sonnet-4-6",
     max_tokens=1024,
-    messages=[
-        {"role": "user", "content": "What is the Zen of Python?"}
-    ],
+    messages=[{"role": "user", "content": "What is the Zen of Python?"}],
 )
 
 print(response.content[0].text)
diff --git a/how-to-use-claude-api-in-python/coding_assistant.py b/how-to-use-claude-api-in-python/coding_assistant.py
index 776e24bddf..84990445c6 100644
--- a/how-to-use-claude-api-in-python/coding_assistant.py
+++ b/how-to-use-claude-api-in-python/coding_assistant.py
@@ -14,9 +14,7 @@
     model="claude-sonnet-4-6",
     max_tokens=1024,
     system=system_prompt,
-    messages=[
-        {"role": "user", "content": user_input}
-    ],
+    messages=[{"role": "user", "content": user_input}],
 )
 
 print(f"\n{response.content[0].text}")
diff --git a/how-to-use-claude-api-in-python/structured_output_1.py b/how-to-use-claude-api-in-python/structured_output_1.py
index 8734f96b1e..59e3c7b583 100644
--- a/how-to-use-claude-api-in-python/structured_output_1.py
+++ b/how-to-use-claude-api-in-python/structured_output_1.py
@@ -35,4 +35,4 @@
 print("--- Approach 1: Hand-written JSON schema ---")
 print(f"Function: {result['function_name']}")
 print(f"\nCode:\n{result['code']}")
-print(f"\nExplanation: {result['explanation']}")
\ No newline at end of file
+print(f"\nExplanation: {result['explanation']}")
diff --git a/how-to-use-claude-api-in-python/structured_output_2.py b/how-to-use-claude-api-in-python/structured_output_2.py
index 742a32500a..af392ddd62 100644
--- a/how-to-use-claude-api-in-python/structured_output_2.py
+++ b/how-to-use-claude-api-in-python/structured_output_2.py
@@ -8,6 +8,7 @@ class FunctionDescription(BaseModel):
     code: str
     explanation: str
 
+
 client = anthropic.Anthropic()
 
 response = client.messages.parse(

From dc225c70c2f2e7e4304e1e5d4fd037be00873282 Mon Sep 17 00:00:00 2001
From: Philipp Acsany <68116180+acsany@users.noreply.github.com>
Date: Fri, 17 Apr 2026 22:46:19 +0200
Subject: [PATCH 4/4] Add README.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 how-to-use-claude-api-in-python/README.md | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 how-to-use-claude-api-in-python/README.md

diff --git a/how-to-use-claude-api-in-python/README.md b/how-to-use-claude-api-in-python/README.md
new file mode 100644
index 0000000000..508fe054d0
--- /dev/null
+++ b/how-to-use-claude-api-in-python/README.md
@@ -0,0 +1,3 @@
+# How to Use the Claude API in Python
+
+This folder contains supporting materials for the Real Python tutorial [How to Use the Claude API in Python](https://realpython.com/claude-api-python/).