Question

我目前正在学习python，我在练习的某些部分遇到困难：

使用！curl将https://raw.githubusercontent.com/MicrosoftLearning/intropython/master/world_temp_mean.csv下载为mean_temp.txt
  ＃[]天气：将world_mean_team.csv导入为mean_temp.txt   以“ r”模式打开文件。   将文本的第一行读取到一个名为heading和print()的变量中。   使用.split(',')将标题转换为列表，该列表在每个逗号print()列表上分开。
  ＃[]天气：打开文件，读/打印第一行，将行转换为列表（以逗号分隔）   使用while循环从文件中读取剩余的行   将剩余的行分配给city_temp变量。   对于循环中的每个city_temp，使用.split(',')将.readline()转换为列表。   打印每个城市和最高的月平均温度。   关闭mean_temps。

提示和提示：

使用标题的打印输出来确定要使用的city_temp索引。   北京的“月平均值：最高”是30.9摄氏度。   使用city_temp将.split(',')转换为列表。
  ＃[]天气：使用while循环可打印城市和摄氏最高的每月平均温度

我正确地完成了第一部分，但是第二部分却很难打印每个城市的温度，而且我不知道该如何解决。

到目前为止，我的代码是：

mean_temp = open('mean_temp.txt', 'r')
read_line = mean_temp.readline()
print(read_line)
heading = read_line.split(',')
print('Heading list: ',heading)
city_temp = ''
while read_line:
    print(read_line[:-1]) # writes the first line in the file
    read_line = mean_temp.readline() # goes to the next line
    city_temp += read_line  # adding the line to the variable
    city_temp1 = city_temp.split(',') # split the line every comma to a list

print(city_temp1)

，输出为：

city,country,month ave: highest high,month ave: lowest low

Heading list:  ['city', 'country', 'month ave: highest high', 'month ave: lowest low\n']
city,country,month ave: highest high,month ave: lowest low
Beijing,China,30.9,-8.4
Cairo,Egypt,34.7,1.2
London,UK,23.5,2.1
Nairobi,Kenya,26.3,10.5
New York City,USA,28.9,-2.8
Sydney,Australia,26.5,8.7
Tokyo,Japan,30.8,0.9
['Beijing', 'China', '30.9', '-8.4\nCairo', 'Egypt', '34.7', '1.2\nLondon', 'UK', '23.5', '2.1\nNairobi', 'Kenya', '26.3', '10.5\nNew York City', 'USA', '28.9', '-2.8\nSydney', 'Australia', '26.5', '8.7\nTokyo', 'Japan', '30.8', '0.9\n']

Answer 1

您的while循环应将行拆分为一个列表，然后使用正确的整数对该列表进行索引以提取城市和高温信息。例如：

mean_temp = open('mean_temp.txt', 'r')
read_line = mean_temp.readline()
heading = read_line.split(',')
print('Heading list: ',heading)
# prints "Heading list:  ['city', 'country', 'month ave: highest high', 'month ave: lowest low\n']", 
# which means index ZERO and index TWO is the correct values to pull from each list created from each line

# Move onto the next line, we want to start the while loop with the first city 
city_temp = mean_temp.readline() # goes to the next line

while city_temp:
    # print(read_line[:-1]) # don't write the whole line to the console, we want to print just the CITY and HIGH TEMP
    city_info = city_temp.split(',') # This is the list 
    print(city_info[0] + ': ' + city_info[2])
    city_temp = mean_temp.readline() # go to the next line at the end of the while loop

# make sure to close the file like the instructions said
mean_temp.close()

以上代码的输出为：

Heading list:  ['city', 'country', 'month ave: highest high', 'month ave: lowest low\n']
Beijing: 30.9
Cairo: 34.7
London: 23.5
Nairobi: 26.3
New York City: 28.9
Sydney: 26.5
Tokyo: 30.8

使用while循环从文件打印

1 个答案: