2.下载数据 16章相关问题

1.csv相关函数

1.1 csv.reader()

  在书上并没有添加b标志参数,这里先不涉及,我们先讨论返回值

import csv
filename = 'data/sitka_weather_07-2018_simple.csv'
with open(filename) as f:
	reader = csv.reader(f)
	header_row = next(reader)
	print(header_row)

  返回值是\(reader\)对象,这里的\(next()\)函数主要返回\(reader\)读取的下一行,返回值是一个以字符串为元素的列表(默认).如果我们用\(for\)循环遍历\(reader\)默认也是返回以字符串为元素的列表(默认)

for line in reader:
		print(line)	

  返回值,只列部分.

['USW00025333', 'SITKA AIRPORT, AK US', '2018-07-01', '0.25', '', '62', '50']
['USW00025333', 'SITKA AIRPORT, AK US', '2018-07-02', '0.01', '', '58', '53']
['USW00025333', 'SITKA AIRPORT, AK US', '2018-07-03', '0.00', '', '70', '54']