变更

python爬虫/python爬虫练习/requests库练习.py

@@ -0,0 +1,29 @@
+import requests
+import time
+
+#爬取100次网页所需时间
+def get_HTML_Text():
+    i = 0
+    while i < 100:
+        try:
+            r = requests.get(url)
+            r.raise_for_status()
+            r.encoding = r.apparent_encoding
+            return r.status_code
+        except:
+            print("出现异常")
+
+    i += 1
+
+
+if __name__ == "__main__":
+    time1 = time.time()
+    url = "http://www.baidu.com"
+    u = 0  # 记录爬取异常次数
+    for i in range(100 + u):
+        if get_HTML_Text() == 200:
+            u = u
+        else:
+            u += 1
+    time2 =time.time()
+    print(f"爬取100次所需要的时间为{time2-time1}秒")