如何在python中将一个csv拆分为多个文件 [英] How to split one csv into multiple files in python

问题描述

我有一个csv文件(world.csv)如下:

I have a csv file (world.csv) looks like this :

"city","city_alt","lat","lng","country"
"Mjekić","42.6781","20.9728","Kosovo"
"Mjekiff","42.6781","20.9728","Kosovo"
"paris","42.6781","10.9728","France"
"Bordeau","16.6781","52.9728","France"
"Menes","02.6781","50.9728","Morocco"
"Fess","6.6781","3.9728","Morocco"
"Tanger","8.6781","5.9728","Morocco"

我想按国家将其拆分为多个文件:

And i want to split it to multiple file by country like this:

Kosovo.csv:

Kosovo.csv :

"city","city_alt","lat","lng","country"
"Mjekić","42.6781","20.9728","Kosovo"
"Mjekiff","42.6781","20.9728","Kosovo"

France.csv:

France.csv :

"city","city_alt","lat","lng","country"
"paris","42.6781","10.9728","France"
"Bordeau","16.6781","52.9728","France"

Morroco.csv:

Morroco.csv :

"city","city_alt","lat","lng","country"
"Menes","02.6781","50.9728","Morocco"
"Fess","6.6781","3.9728","Morocco"
"Tanger","8.6781","5.9728","Morocco"

推荐答案

如果不能使用熊猫，则可以使用内置的csv模块和itertools.groupby()函数.您可以使用它来按国家/地区分组.

If you can't use pandas you can use the built-in csv module and itertools.groupby() function. You can use this to group by country.

from itertools import groupby
import csv

with open('world.csv') as csv_file:
    reader = csv.reader(csv_file)
    next(reader) #skip header

    #Group by country
    lst = sorted(reader, key=lambda x : x[4])
    groups = groupby(lst, key=lambda x : x[4])

    for k,g in groups:
        filename = k + '.csv'
        with open(filename, 'w', newline='') as fout:
            csv_output  = csv.writer(fout)
            csv_output.writerow(["city","city_alt","lat","lng","country"])
            for line in g:
                csv_output.writerow(line)

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