在python中使用csv读写CSV

1.通常读写方式

# 读取csv文件
import csv
with open('some.csv', 'rb') as f:        # 采用b的方式处理能够省去不少问题
    reader = csv.reader(f)
    for row in reader:
        # do something with row, such as row[0],row[1]


import csv
with open('some.csv', 'wb') as f:      # 采用b的方式处理能够省去不少问题
    writer = csv.writer(f)
    writer.writerows(someiterable)

2.字典读写方式

# 读
import csv
with open('names.csv') as csvfile:
    reader = csv.DictReader(csvfile)
    for row in reader:
    print(row['first_name'], row['last_name'])



# 写

import csv
with open('names.csv', 'w') as csvfile:
    fieldnames = ['first_name', 'last_name']
    writer = csv.DictWriter(csvfile, fieldnames=fieldnames)

    writer.writeheader()
    writer.writerow({'first_name': 'Baked', 'last_name': 'Beans'})
    writer.writerow({'first_name': 'Lovely', 'last_name': 'Spam'})
    writer.writerow({'first_name': 'Wonderful', 'last_name': 'Spam'})