工程目錄

.
└── com
    ├── app
    │   ├── crawler02.py
    │   └── __init__.py
    ├── core
    │   ├── crawler_core.py
    │   └── __init__.py
    │   
    │      
    │       

    ├── crawler01.py
    ├── __init__.py
    │   
    └── tool

目的

crawler01 和 crawler02都需要呼叫crawler_core（下簡稱f）中的方法。
crawler01 是f的父級目錄下的檔案其呼叫方法是：

#!/usr/bin/env python
#coding=utf-8
from core import crawler_core
if __name__ == '__main__':
    url = "url"
    html = crawler_core.getHtml(url)
    print(html)

crawler02 是f的同級目錄下的檔案其呼叫方法是：

#!/usr/bin/env python
#coding=utf-8
import os
import sys
sys.path.append(os.path.abspath(os.path.dirname(__file__)+'/'
 
+'..'))
from core import crawler_core
url = "url"
html = crawler_core.getHtml(url)
print(html)

上面是把把當前python程式所在目錄的父目錄的絕對路徑加入到環境變數PYTHON_PATH中。PYTHON_PATH是python的搜尋路徑，再引入模組時就可以從父目錄中搜索得到了

crawler_core的程式碼：python3.X 後使用urllib.request

#!/usr/bin/env python
#coding=utf-8
#簡單爬蟲實現
import urllib.request 

def
 
 getHtml(url):

    page  =urllib.request.urlopen(url)
    html = ""
    for line in page.readlines():
        html = html+str(line)+"\n"
    return html