第一個python程序

  版本上線,有個洗數據的流程。php

  根據一個文件,把sql生成出來。python

  習慣了利用php,很是簡單的幾句代碼就寫出來。由於沒寫過python,就想用py寫下,雖然沒啥技術含量,也就當練習下。sql

原文件格式以下:  app

30001,BACDH45101
30001,BACHXZ5101
30002,BACJD45101
30003,BACTG45101
30003,BAGLP45101
30004,BAYXJ45101
30004,BFAKJ41101
30005,BFBDZ41102
30005,BFBDZ41119
...
...
...

 

 

php 代碼:spa

$data = file_get_contents("flushdata.log");

$arr = explode(PHP_EOL, $data);

foreach ($arr as $item){
    $items = explode(',', $item);
    if($tagc = $items[0]){
        $temp[$tagc][] = $items[1];
    }
}
$str = '';
foreach ($temp as $key => $val){
    $ins = "'".implode("','", $val)."'";
    $str .= "update list set tag=". $key. " where mid in (". $ins. ");".PHP_EOL;
}

file_put_contents("flushdata_php.sql", $str);

 

 

py代碼:code

 1 #! /usr/bin/python
 2 
 3 file_object = open('flushdata.log')
 4 try:
 5      contents = file_object.readlines()
 6      d = {}
 7      for line in contents:
 8         sp = line.split(',')
 9         tagc = sp[0]
10         mid = sp[1].strip('\n')
11         if tagc in d:
12             d[tagc].append(mid)
13         else :
14             d[tagc] = [mid]
15 
16      arr = sorted(d.keys())
17 
18      str = ""
19      for tagc in arr:
20         str += "update list set tag=" + tagc + " where mid in ("
21         str += "'" + "','".join(d[tagc]) + "'"
22         str += ");\n"
23 
24      file_object = open('flushdata_py.sql', 'w')
25      file_object.write(str)
26      file_object.close()
27 
28 finally:
29      file_object.close()

 

執行後,diff下倆文件一致blog

diff -b -B  flushdata_php.sql flushdata_py.sql

 

python的語法不太熟悉,第一次寫比較生硬...ip

各類冒號 TAB,dict 和list的用法 簡單應用了下get

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