Python第五次作业——檀健勇

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

you=0

liang=0

zhong=0

list=[]

list1=[]

with open("pmi_days.csv", 'r') as f:

    reader = csv.reader(f)

    fieldnames = next(reader)  

    csv_reader = csv.DictReader(f,fieldnames=fieldnames)

    for row in csv_reader:

        dict = {}

        for key, value in row.items():

            dict[key] = value

            if value=='优':

                you=you+1

            if value=='良':

                liang=liang+1

            if value=='中度污染':

                zhong=zhong+1

            if value=='中度污染':

                zhong=zhong+1

            if key=='PM2.5':

                list.append(int(dict.get("PM2.5")))

                list1.append(dict.get("日期"))

    for i in range(0,len(list)):

        if list[i]==max(list):

            d=list1[i]

        if list[i] == min(list):

            x = list1[i]

    print("优：{}天".format(y))

    print("良：{}天".format(l))

    print("中度污染：{}天".format(z))

    print("PM2.5最大值:{} 日期：{}".format(max(list),d))

    print("PM2.5最小值:{} 日期：{}".format(min(list),x))

 

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]
........
}

3.遍历字典数据，求出GDP的最小值与最大值，并输出数据与对应的年份。

 

import csv

list=[]

list1=[]

zidian={}

daxiao=[]

d=0

e=0

with open("1980-2018GDP.csv",'r') as f:

    reader = csv.reader(f)

    fieldnames = next(reader)

    print(fieldnames)

    csv_reader = csv.DictReader(f,fieldnames=fieldnames)

    for row in reader:

        list.append(row)

    for i in range(0,len(list)):

        print("%-8s"%list[i][0],"\t%-10.7s"%list[i][1],"\t%-12.5s"%list[i][2],"\t%-13.5s"%list[i][3],list[i][4])

with open("1980-2018GDP.csv", 'r') as f:

    reader = csv.reader(f)

    fieldnames = next(reader)

    csv_reader = csv.DictReader(f, fieldnames=fieldnames)

    for row in csv_reader:

        dict={}

        for  key,value in row.items():     

            dict[key] = value

            if key == 'GDP(亿元)':

                daxiao.append(float(dict.get('GDP(亿元)')))

        dict.get('年份')

        list1.append(int(dict.get('年份')))

    for i in range(0, len(list)):

        zidian[list1[i]] = list[i][1:]

    print(zidian)

    for i in range(0,len(daxiao)):

        if daxiao[i]==max(daxiao):

            d=list1[i]

        if daxiao[i]==min(daxiao):

            e=list1[i]

    print("PM2.5最大值:{}    日期：{}".format(max(daxiao), d))

    print("PM2.5最小值:{}      日期：{}".format(min(daxiao), e))

 

 

 

标签：Python,檀健勇,list,fieldnames,第五次,dict,reader,print,csv
来源： https://www.cnblogs.com/tantan19971106/p/10919866.html