import csv

1. csv.reader:

   reader(csvfile[, dialect=’excel’][, fmtparam])

       reader = csv.reader(file('glucoseData.csv', 'rb'))
       for line in reader:
           print line
   
       >>['l490', 'l660', 'l730', 'l850', 'l930', 'glucose', 'glucose_level']
       ['0.221', '0.329', '0.323', '0.443', '0.355', '8.1', '3'
    
   ]
       ['0.21', '0.328', '0.322', '0.438', '0.371', '7.6', '3']
       ['0.203', '0.318', '0.309', '0.387', '0.371', '7.4', '3']
       ['0.2', '0.289', '0.3', '0.367', '0.297', '5.9', '2']

2. csv.writer

   writer(csvfile[, dialect=’excel’][, fmtparam])

       writer = csv.writer(file('your.csv', 'wb'))
       writer.writerow(['Column1'
    
   , 'Column2', 'Column3'])
       lines = [range(3) for i in range(5)]
       for line in lines:
           writer.writerow(line)

3. DictWriter

   可以把json格式的字典儲存成csv

       rows = [{'Column1': '0', 'Column2': '1', 'Column3': '2', 'Column4': '3'},
               {'Column1': '0', 'Column2': '1', 'Column3': '2', 'Column4': '3'
    
   },
               {'Column1': '0', 'Column2': '1', 'Column3': '2', 'Column4': '3'},
               {'Column1': '0', 'Column2': '1', 'Column3': '2', 'Column4': '3'},
               {'Column1': '0', 'Column2': '1', 'Column3': '2', 'Column4': '3'}]
   
       ＃ 這樣就可以直接呼叫DictWriter.writerows方法來處理了:
   
       import csv
   
       fieldnames = ['Column1', 'Column2', 'Column3', 'Column4']
       dict_writer = csv.DictWriter(file('your.csv', 'wb'), fieldnames=fieldnames)
       dict_writer.writerow(fieldnames) # CSV第一行需要自己加入
       dict_writer.writerows(rows)  # rows就是表單提交的資料

4. 結合with open as 使用

   確保檔案使用後關閉

   with open(file('glucoseData.csv', 'rb')) as csvFile:
   
       reader = csv.reader(csvFile)
       for line in reader:
           print line