Python CSV檔案處理 讀寫

python csv檔案處理/讀寫

csv全稱為「comma separated values」,是一種格式化的檔案，由行和列組成，分隔符可以根據需要來變化。

如下面為一csv檔案：

title,release date,director

and now for something completely different,1971,ian macnaughton
monty python and the holy grail,1975,terry gilliam and terry jones
monty python's life of brian,1979,terry jones
monty python live at the hollywood bowl,1982,terry hughes
monty python's the meaning of life,1983,terry jones

列印發行日期及標題。

逐行處理：
for line in open("samples/sample.csv"):
title, year, director = line.split(",")
print year, title
使用csv模組處理：
import csv
reader = csv.reader(open("samples/sample.csv"))
for title, year, director in reader:
print year, title
改變分隔符
建立一csv.excel的子類，並修改分隔符為」;」
# file: csv-example-2.py
import csv
class skv(csv.excel):
# like excel, but uses semicolons
delimiter = ";"
csv.register_dialect("skv", skv)
reader = csv.reader(open("samples/sample.skv"), "skv")
for title, year, director in reader:
print year, title
如果僅僅僅是改變一兩個引數，則可以直接在reader引數中設定，如下：
# file: csv-example-3.py
import csv
reader = csv.reader(open("samples/sample.skv"), delimiter=";")
for title, year, director in reader:
print year, title
將資料存為csv格式
通過csv.writer來生成一csv檔案。
# file: csv-example-4.py
import csv
import sys
data = [
("and now for something completely different", 1971, "ian macnaughton"),
("monty python and the holy grail", 1975, "terry gilliam, terry jones"),
("monty python's life of brian", 1979, "terry jones"),
("monty python live at the hollywood bowl", 1982, "terry hughes"),
("monty python's the meaning of life", 1983, "terry jones")] 
writer = csv.writer(sys.stdout)
for item in data:
writer.writerow(item)

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