2022.8.14 python csv模块的使用b

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CSV模块功能介绍： 使用实例

csv.reader():

with open(filename) as f:

reader = csv.reader(f)

调用csv.reader()并将前面存储的文件对象作为实参传递给他，从而创建一个与该文件相关联的阅读器对象，这个阅读器对象被赋给了reader变量。

next():

import csv

filename = ‘sitka_weather_07-2018_simple.csv’

with open(filename) as f:#（注意缩进）

        reader = csv.reader(f)

        header_row = next(reader)

        print(header_row)

csv模块中的next（）函数，调用他并传入阅读器对象，从而读取阅读器对象中的文件，他将返回文件中的下一行。只调用一次则得到的是文件的第一行。

next，那么就相当于把指针fp向下移动一行
从下一行再开始读取

enumerate（sequence, [start=0]）——枚举

for index,column_header in enumerate(header_row):

#对列表调用enumerate()来获取每个元素的索引和其值

print(index,column_header)

输出结果为：
0 STATION

1 NAME

2 DATE

3 PRCP

4 TAVG

5 TMAX

6 TMIN

datetime模块：

datetime.strptime()函数：

strptime() 和 strftime()，可以在字符串与 datetime 对象之间互相转换。strptime() 可以读取字符串中的日期与时间信息并将其转换为 datetime 对象，而 strftime 则是将 datetime 对象转换为字符串。

指令格式A%等：https://docs.python.org/zh-cn/3/library/datetime.html#strftime-strptime-behavior

fig.autofmt_xdate()#绘制倾斜的日期标签避免重叠，X轴

————————函数介绍链接————————————————————————

图形绘表区域着色：

ax.fill_between(dates,highs,lows,facecolor=’blue’,alpha=0.1)

方法fill_between（），接受一个X值系列和两个Y值系列，并填充两个Y系列之间的空间

作者：木淡
链接：https://www.jianshu.com/p/e0c89caa8741
来源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

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