fix: add User-Agent header to online fetch requests

Fixes #1

Requests to Wiktionary were failing with HTTP 403.
Wikimedia now rejects requests that do not include a User-Agent header.

Author: lennon-c

docs/Fetching XML data/Special Exports.md

@@ -43,9 +43,14 @@ To programmatically fetch and download XML content, you can use Python's `reques
 def fetch(title):
     # Construct the URL for the XML export of the given page title
     url = f'https://de.wiktionary.org/wiki/Spezial:Exportieren/{title}'
-    
+
+    # Set User-Agent header
+    headers = {
+        "User-Agent": "Search for German words (https://lennon-c.github.io/python-wikitext-parser-guide)"
+    }
+
     # Send a GET request
-    resp = requests.get(url)
+    resp = requests.get(url, headers=headers)
 
     # Check if the request was successful, and raise an error if not
     resp.raise_for_status()

docs/Parsing Wikitext/Parsing Wikitext.md

@@ -19,7 +19,10 @@ We will use the page titled `stark` ([Wiktionary page](https://de.wiktionary.org
 @functools.cache
 def fetch(title):
     url = f'https://de.wiktionary.org/wiki/Spezial:Exportieren/{title}'
-    resp = requests.get(url)
+    headers = {
+        "User-Agent": "Search for German words (https://lennon-c.github.io/python-wikitext-parser-guide)"
+    }
+    resp = requests.get(url, headers=headers)
     resp.raise_for_status()
     return resp.text
 

docs/Parsing XML/Parsing XML from Special Export.md

@@ -11,7 +11,10 @@ We will use the `fetch` function as described in our earlier tutorial on Special
 ```python exec="true" source="above"   session="requests" 
 def fetch(title):
     url = f'https://de.wiktionary.org/wiki/Spezial:Exportieren/{title}'
-    resp = requests.get(url)
+    headers = {
+        "User-Agent": "Search for German words (https://lennon-c.github.io/python-wikitext-parser-guide)"
+    }
+    resp = requests.get(url, headers=headers)
     resp.raise_for_status()
     return resp.text
 ```
@@ -258,7 +261,10 @@ import lxml.etree as ET
 
 def fetch(title):
     url = f'https://de.wiktionary.org/wiki/Spezial:Exportieren/{title}'
-    resp = requests.get(url)
+    headers = {
+        "User-Agent": "Search for German words (https://lennon-c.github.io/python-wikitext-parser-guide)"
+    }
+    resp = requests.get(url, headers=headers)
     resp.raise_for_status()
     return resp.text
 

pycon_at/update.py

@@ -36,7 +36,7 @@ def update_workshop_index(commit_msg = "Update workshop index"):
     render_workshop()
     create_index_md()
 
-    update_notebooks()
+    update_notebooks(commit_msg = "Update pycon_at - fixing 403 error")
     update_workshop_index()