Question

嘿，每个人都有一个关于文本文件的问题，并将其放入字典中。

因此，我的代码首先通过从网站收集数据并将其写入文本文件开始。从那里我重新打开文件，并将其放入字典，以将数据从文本传输到字典。在while循环中，我得到了

的错误

 key,value = line.split()
ValueError: too many values to unpack (expected 2)

我不确定为什么我使用错误的方法将文本文件数据写入“ countryName”程序中的新位置

然后编译后，我希望能够要求用户输入一个国家名称，这将给出该国家的人均收入，如打印行所示。

def main():
    import requests
    webFile = "https://www.cia.gov/library/publications/the-world-factbook/rankorder/rawdata_2004.txt"
    data = requests.get(webFile) #connects to the file and gest a response object
    with open("capital.txt",'wb') as f:
        f.write(data.content) #write the data out to a file – wb used since thecontent from the response object is returned as abinary object.
    f.close()
    infile = open('capital.txt', 'r')
    line = infile.readline()
    countryName = {}
    while line != "":
        key,value = line.split() 
        countryName[key] = value
        line = infile.readline()
    infile.close()
    userInput = input("Enter a country name: ")
    for i in countryName:
        while(userInput != 'stop'):
            print("The per capita income in",countryName[key], "is",countryName[value])
            userInput = input("Enter a country name: ")
main()

Answer 1

每行的开头也都有一个数字，并且某些国家/地区名称中包含空格，从而导致split返回更长的列表。如果使用正则表达式添加分号作为定界符，并修剪前导和尾随空白，则拆分工作正常。这段代码将进入第一个while循环

line = re.sub(r"(\$)", r";\1", line) # add semicolon before $ sign
line = re.sub(r'^([0-9]+)',r'\1;', line) # add semicolon after first group of numbers
num, key, value = re.split(r';', line) # split with semicolons as delimiters
countryName[key.strip()] = value.strip() # assign key and values after stripping whitespace

Answer 2

拆分返回列表，而不是字典。

a = 'a b c'
list = a.split() #-> ['a','b','c']

您是否正在尝试做类似的事情：

import requests

webFile = "https://www.cia.gov/library/publications/the-world-factbook/rankorder/rawdata_2004.txt"
data = requests.get(webFile).text #connects to the file and gest a response object
print(data)
while(1):
    name = input('Enter a country name: ')
    for a in data.splitlines():
        if name.lower() in a.lower():
            print(a.split()[-1])

在python中将文本文件读取到字典的问题

2 个答案: