Add files via upload

Ch1_crawl_links.py

@@ -0,0 +1,7 @@
+# author = [email protected]
+# -*- coding: cp936 -*-
+# coding: cp936
+
+import urllib2
+import re
+import Ch1_download

Ch1_crawl_via_id.py

@@ -0,0 +1,30 @@
+# author = [email protected]
+# -*- coding: cp936 -*-
+# coding: cp936
+
+import itertools
+import re
+import Ch1_download
+
+def crawl_via_id_0():
+    for page in itertools.count(1):
+        url = 'http://example.webscraping.com/places/default/view/-%d' % page
+        html = Ch1_download.download_3(url)
+        if html is None:
+            break
+        else:
+            pass
+
+
+def crawl_via_id_1():
+    max_errors = 5
+    num_errors = 0
+    for page in itertools.count(1):
+        url = 'http://example.webscraping.com/places/default/view/-%d' % page
+        html = Ch1_download.download_3(url)
+        if html is None:
+            num_errors += 1
+            if num_errors == max_errors:
+                break
+        else:
+            num_errors = 0