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python - 从两个 txt 文件中读取数据并将相关信息写入第三个 txt 文件

问题描述

编写一个读取两个国家数据文件的程序，worldpop.txt并且worldarea.txt. 这两个文件以相同的顺序包含相同的国家/地区。编写一个density.txt包含国家名称和人口密度（每平方公里人口）的文件。

世界流行音乐.txt：

China 1415045928
India 1354051854
U.S. 326766748
Indonesia 266794980
Brazil 210867954
Pakistan 200813818
Nigeria 195875237
Bangladesh 166368149
Russia 143964709
Mexico 130759074
Japan 127185332
Ethiopia 107534882
Philippines 106512074
Egypt 99375741
Viet-Nam 96491146
DR-Congo 84004989
Germany 82293457
Iran 82011735
Turkey 81916871
Thailand 69183173
U.K. 66573504
France 65233271
Italy 59290969

世界区域.txt：

China 9388211
India 2973190
U.S. 9147420
Indonesia 1811570
Brazil 8358140
Pakistan 770880
Nigeria 910770
Bangladesh 130170
Russia 16376870
Mexico 1943950
Japan 364555
Ethiopia 1000000
Philippines 298170
Egypt 995450
Viet-Nam 310070
DR-Congo 2267050
Germany 348560
Iran 1628550
Turkey 769630
Thailand 510890
U.K. 241930
France 547557
Italy 294140

density.txt 应该是这样的：

China 150.7258334947947
India 455.42055973550293
U.S. 35.72228540943785
Indonesia 147.27279652456156
Brazil 25.22905263611282
Pakistan 260.49945257368205
Nigeria 215.06553465748763
Bangladesh 1278.0836521471922
Russia 8.790734065789128
Mexico 67.26462820545795
Japan 348.8783091714556
Ethiopia 107.534882
Philippines 357.2192843009022
Egypt 99.8299673514491
Viet-Nam 311.1914922436869
DR-Congo 37.054757945347475
Germany 236.0955273123709
Iran 50.35874550980934
Turkey 106.43669165703
Thailand 135.41696451290883
U.K. 275.1767205389989
France 119.13512383185677
Italy 201.57397497790168

我写的程序：

f=open('worldpop.txt','r')
f2=open('worldarea.txt','r')
out=open('density.txt','w')

for line1 in f: #finding country names
    pos1=line1.find(' ')
    country=line1[0:pos1]+'\n'

for line2 in f: #finding population numbers
    pos2=line2.find(' ')
    population=line2[pos2+1:]

for line3 in f2: #finding area numbers
    pos3=line3.find(' ')
    area=line3[pos3+1:]

for line1 in f: #writing density to a new file
    density=population/area
    out.write(density)
out.close()
f.close()
f2.close()

当我运行程序时，密度.txt 是空的。我该如何解决这个问题？谢谢。注意：我知道它的替代解决方案，但我主要想用这种方法解决它，所以请不要使用其他方法。

标签： pythonpython-3.x

解决方案

这是您的功能和测试代码：

pop = open('worldpop.txt', 'r') #r is for read
area = open('worldarea.txt', 'r')
out = open('density.txt', 'w')
poplist = pop.readlines() #will read the file and put each line into a list (new element)
arealist = area.readlines()
output = []
for i in range(len(poplist)):
     poplist[i] = poplist[i].split(" ")
     #slices the elements into lists, so we get a list of lists
     poplist[i][1] = poplist[i][1].replace("\n", "")
for i in range(len(arealist)):
     arealist[i] = arealist[i].split(" ")
     arealist[i][1] = arealist[i][1].replace("\n", "")
     #two indexes : we're in a list of lists
for i in range(len(poplist)):
    out.write(poplist[i][0]+" ")
    out.write(str(int(poplist[i][1])/int(arealist[i][1]))+"\n")
out.close()
pop.close()
area.close()

有用 ！我没有使用循环来读取行，而是使用“readlines”，这使一切变得更加简单。然后我只需要清除列表并获取输出。

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