Python csv檔案基本操作

**摘錄自《python爬蟲開發與專案實戰》chapter5

csvtest.py

import csv

from collections import namedtuple  # namedtuple是繼承自tuple的子類。namedtuple建立乙個和tuple類似的物件，而且物件擁有可訪問的屬性。
headers = ['id', 'username', 'password', 'age', 'country']
rows = [(1001, "qiye", "qiye_pass", "24", "china"),(1002, "mark", "mark_pass", "24", "usa"),(1003, "alice", "alice_pass", "24", "usa")]
rows1 = [,,]
with open('qiye.csv', 'w') as f:
f_csv = csv.writer(f)
f_csv.writerow(headers)
f_csv.writerows(rows)
with open('qiye1.csv', 'w') as f2:  
# 以字典的形式寫檔案
f2_csv = csv.dictwriter(f2,headers) 
f2_csv.writeheader()
f2_csv.writerows(rows1)
with open('qiye.csv') as f :
f_csv = csv.reader(f)
headers = next(f_csv)
print(headers)
row = namedtuple('row', headers) # 定義了乙個row類，包含header中的5個屬性
for r in f_csv:
print(r) #
if len(r)!=0 :
#用list建立了乙個row的物件，對該類中的屬性賦值。
row = row(*r)                       # 輸出 ['1001', 'qiye', 'qiye_pass', '24', 'china']
print(row.username, row.password)   # 輸出 qiye qiye_pass
print(row)                          # 輸出 row(id='1001', username='qiye', password='qiye_pass', age='24', country='china')
with open('qiye.csv') as f1:
#以字典的形式讀取檔案
f_csv = csv.dictreader(f1) 
for row in f_csv:
print(row.get('username'))    # 輸出qiye

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