python csv檔案的操作

python 對csv檔案的操作十分簡單，幾行**即可搞定csv檔案，通常分為讀操作和寫操作。

讀取普通csv,不帶欄位名稱

示例**：

>>> import csv

>>> with open('test.csv', 'rb') as csvfile:
...     spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|')
...     for row in spamreader:
...         print ', '.join(row)
spam, spam, spam, spam, spam, baked beans
spam, lovely spam, wonderful spam

例項**：

>>> import csv

>>> with open('names.csv') as csvfile:
...     reader = csv.dictreader(csvfile) # 注意函式是大寫
...     for row in reader:
...         print(row['first_name'], row['last_name'])
...baked beans
lovely spam
wonderful spam

寫普通csv檔案

示例**：

import csv

with open('eggs.csv', 'wb') as csvfile:
spamwriter = csv.writer(csvfile, delimiter=' ',
quotechar='|', quoting=csv.quote_minimal)
spamwriter.writerow(['spam'] * 5 + ['baked beans'])
spamwriter.writerow(['spam', 'lovely spam', 'wonderful spam'])

寫帶欄位名稱的csv檔案

例項**:

import csv

with open('names.csv', 'w') as csvfile:
fieldnames = ['first_name', 'last_name']
writer = csv.dictwriter(csvfile, fieldnames=fieldnames)
writer.writeheader() # 注意有寫header操作
writer.writerow()
writer.writerow()
writer.writerow()

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