python之读取和写入csv文件

写入csv文件源码：

 #输出数据写入CSV文件
 import csv
 data = [
     ("Mike", "male", 24),
     ("Lee", "male", 26),
     ("Joy", "female", 22)
 ]

 #Python3.4以后的新方式，解决空行问题
 with open('d://write.csv', 'w', newline='') as csv_file:
     csv_writer = csv.writer(csv_file)
     for list in data:
         print(list)
         csv_writer.writerow(list)

读取csv文件源码：

 #读取csv文件内容
 import csv
 list  = []
 reader = csv.reader(open("d://demo.csv"))
 #csv中有三列数据，遍历读取时使用三个变量分别对应
 for title, year, director in reader:
   list.append(year)
   print(title, "; ",  year , "; ",  director)

 print(list)

读取运行结果：

 

 

读取csv文件内容更多方式：

 # 读取csv文件内容
 # date：2017-08-26
 import csv

 file = "d://write.csv"

 def csv_read(file):
     '''
     获取每个元素
     :param file: 读取文件
     :return: 元素列表
     '''
     with open(file) as file:
         list = []
         csv_reader = csv.reader(file)
         for id, data, *args in csv_reader:
             # 跳过表头
             if id == "   ":
                 continue
             print(id, data)
             list.append(data)
         return list

 def csv_read_by_next(file):
     '''
     逐行取值
     :param file: 读取文件
     :return: 逐行打印内容（列表形式）
     '''
     with open(file) as file:
         csv_reader = csv.reader(file)
         while True:
             try:
                 csv_next_row = next(csv_reader)
             except:
                 break
             else:
                 print(csv_next_row)

 csv_read_by_next(file)
 '''
 ['Mike', 'male', '24']
 ['Lee', 'male', '26']
 ['Joy', 'female', '22']
 '''