写入csv文件
#以元组的形式写入
def write_csv1():
header=["username","age","height"]
values=[("张三","18","180"),
("李四","19","190"),
("孙五","20","160")]
with open("abc.csv",'w',encoding='utf-8',newline='') as fp:#newline=''是为了防止行与行之间有空格,默认为'\n '
writer=csv.writer(fp)
writer.writerow(header)#把表头读入
writer.writerows(values)
#以字典的形式写入
def write_csv2():
header=["username","age","height"]
values=[{"name":"张三","Age":"18","height":"180"},
{"name": "李四", "Age": "19", "height": "190"},
{"name": "孙五", "Age": "20", "height": "160"}]
with open("abc.csv",'w',encoding='utf-8',newline='') as fp:#newline=''是为了防止行与行之间有空格,默认为'\n '
writer=csv.DictWriter(fp,header)
writer.writeheader()#把表头读入
writer.writerows(values)
爬虫的读出:
def read_csv1():
with open("abc.csv", "r") as fp:
reader = csv.reader(fp) # reader是一个迭代器
next(reader) # 不想读取第一行
for x in reader:
name = x[1] # 取第2列
volumn = x[-1] # 去最后一列
print({"name:": name, "volumn": volumn})
def read_csv2():
with open("文件的名字","r") as fp:
#reader是一个迭代器,是以字典的形式读出来
reader=csv.DictReader(fp)
for x in reader:
value={"name":x["name"],"volumn":x["volumn"]}
print(value)