python第5次作业--郑懿

习题1：读入文件pmi_days.csv，完成以下操作：
1.统计质量等级对应的天数，例如：
优：5天
良：3天
中度污染：2天
2.找出PMI2.5的最大值和最小值，分别指出是哪一天。

import csv

a = 0;
b = 0;
c = 0;
d = 0
n = []
with open("pmi_days.csv", "r") as f:
    reader = csv.reader(f)
    fieldnames = next(reader)
    csv_reader = csv.DictReader(f,  fieldnames=fieldnames)     # 存放键名
    for row in csv_reader:
        dict = {}
        for key, value in row.items():
            dict[key] = value
        if (dict["质量等级"] == "优"):
            a = a + 1
        elif (dict["质量等级"] == "良"):
            b = b + 1
        elif (dict["质量等级"] == "中度污染"):
            c = c + 1
        elif (dict["质量等级"] == "轻度污染"):
            d = d + 1
        n.append(list(dict.values()))

    for row in range(0, len(n)):
        n[row][3] = int(n[row][3])
    for i in range(0, len(s) - 1):
        for j in range(i + 1, len(n)):
            if (n[i][3] < n[j][3]):
                a = n[j][3]
                n[j][3] = n[i][3]
                n[i][3] = a

                b = n[j][0]
                n[j][0] = n[i][0]
                n[i][0] = b

print("中度污染出现次数为:", a)
print("轻度污染出现次数为:", b)
print("良出现次数为:", c)
print("优出现次数为:", d)
print("PMI2.5的\n最大值{}: "n[0][3])
print("对应的日期为{}\n最小值{}:"n[0][0],n[-1][3])
print ("对应的日期为{}："n[-1][0])

习题2：读入文件1980-2018GDP.csv，完成以下操作：
1.按行输出每年GDP数据，表头列名如文件第1行所示。

2.将各年GDP数据转换成字典格式，以年份为keys,其它值为values（数据类型为列表方式）,例如：
{
2017:[827121.7,6.8%,60989]
........
}

import pandas as pd

path = open("1980-2018GDP.csv")
data = pd.read_csv(path)


print("1：\n")
print(data,end="\n")

dict = data.set_index('年份').T.to_dict('list')
print("2：\n")
print("dictionaries：", end="")
print(format(dict),end="\n")

max = max(dict, key=dict.get)
min = min(dict, key=dict.get)
print("3：\n")
print("GDP最大值：{}\t对应的年份：{}".format(dict[max][0],max))
print("GDP最小值：{}\t对应的年份：{}".format(dict[min][0],min))