【小白求助】用python 统计人口

首先，你的数据第一行 country 拼写有误。
假设你的数据是保存在 data.csv 文件里，则可以直接使用 csv 模块。
比如，第一个问题的解法：
import csv
csvfile = open('data.csv')
rows = list(csv.reader(csvfile, delimiter = '|'))
country_list = [(v[0], int(v[2].replace(',', ''))) for v in rows if v[1] == 'country']
country_max = max(country_list, key = lambda x: x[1])[0]
print 'Country with smallest population in 2010 is', country_max
I

第二个问题使用的是集合并集：
import csv
csvfile = open('data.csv')
rows = list(csv.reader(csvfile, delimiter = '|'))
country_set = {v[0] for v in rows if v[1] == 'country'}
city_set = {v[0] for v in rows if v[1] == 'city'}
print 'The names of the counties that have at least one city, at least one town, and at least one reservation:', ', '.join(country_set.intersection(city_set))
I

不用csv模块的话，就直接使用字符串的split：
content = '''Albany|country|294,571|304,204
Albany|city|94,444|97,856
Berne|town|2,853|2,794
Bethlehem|town|31,338|33,656'''
rows = [row.split('|') for row in content.split()]
country_list = [(v[0], int(v[2].replace(',', ''))) for v in rows if v[1] == 'country']
country_max = max(country_list, key = lambda x: x[1])[0]
print 'Country with smallest population in 2010 is', country_max
country_set = {v[0] for v in rows if v[1] == 'country'}
city_set = {v[0] for v in rows if v[1] == 'city'}
print 'The names of the counties that have at least one city, at least one town, and at least one reservation:', ', '.join(country_set.intersection(city_set))
上面的代码包含了两个问题的解I

请贴出原题目。

先用numpy.genfromtext()获得格式化的数据，然后就好办了

这样交流太费劲了，到智普教育jeapedu学python开发吧

test

。。。。

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