变更

python爬虫/爬虫协程.py

@@ -0,0 +1,25 @@
+import asyncio
+import requests
+
+
+async def download(url):
+    print('start')
+    await asyncio.sleep(2) # 网络请求，不能用requests.get()
+    print('end')
+
+
+async def main():
+    urls = [
+        'http://www.baidu.com',
+        'http://www.bilibli.com',
+        'http://www.163.com'
+    ]
+    tasks = []
+    for url in urls:
+        d = download(url)
+        tasks.append(tasks)
+
+    await asyncio.wait(d)
+
+if __name__ == '__main__':
+    asyncio.run(main())