Python3 CSV文件

CSV：逗號分隔值，其文件以純文本形式存儲表格數據。一般通用的用法在下面的代碼中。

#csv文件的讀寫
import  csv
#將數據寫入csv文件
title = ['編號','姓名','年齡','性別']
data = [(1,'張三',20,'男'),(2,'小紅',18,'女')]

with open('userInfo.csv','w',encoding='gb18030',newline='') as fp: #這裏是創建文件
    writer = csv.writer(fp)
    writer.writerow(title)
    writer.writerows(data)
    pass

with open('userInfo.csv','r',encoding='gb18030',newline='') as fp:
    reader = csv.reader(fp)#返回的是迭代器
    for i in reader:
        print(i)
    pass

#行讀取
with open('userInfo.csv','r',encoding='gb18030',newline='') as fp:
    result = fp.readline()
    while result:
        print(result,end='')
        result = fp.readline()

#將csv文件讀取爲字典結構
with open('userInfo.csv','r',encoding='gb18030',newline='') as fp:
    dicts = csv.DictReader(fp)
    for line in dicts:
        print(dict(line),'*')

#將字典寫入CSV
dicts = {'編號': '1', '姓名': '張三', '年齡': '20', '性別': '男'}
with open('userInfo1.csv','w',encoding='gb18030',newline='') as fp:
    dictW =csv.DictWriter(fp,fieldnames=dicts.keys())
    dictW.writeheader()
    dictW.writerow(dicts)

輸出結果：

['編號', '姓名', '年齡', '性別']
['1', '張三', '20', '男']
['2', '小紅', '18', '女']
編號,姓名,年齡,性別
1,張三,20,男
2,小紅,18,女
{'編號': '1', '姓名': '張三', '年齡': '20', '性別': '男'} *
{'編號': '2', '姓名': '小紅', '年齡': '18', '性別': '女'} *