通过向带空格的字符串添加双引号将值写入 python 中的文件

Question

我正在尝试以特定方式在 txt 文件中写入以下列表的值

valList = ['1','Age',' Address has spaces','employee','98363','hobbies has space in it ']

sample.txt

1,Age,"Address has spaces",employee,98363,"hobbies has space in it "

这里如果你看到valList是一个异构列表，我的唯一目的是写出其中有空格并用双引号括起来的值，其余所有值都应该按原样写。到目前为止我已经尝试过：

valList = ['1','Age',' Address has spaces','employee','98363','hobbies has space in it ']
# Output = 1,Age,"Address has spaces",employee,98363,"hobbies has space in it "
valstr = ",".join(valList)
with open('sample.txt','wb') as file:
    file.write(valstr)
    file.write('\n' + " \"" + valList[2] + "\" ")

使用 file.write('\n' + " \"" + valList[2] + "\" ") 行我可以写一个带引号的价值，但是我需要一种通用的方法来为给定的列表写入带有空格的值。

非常感谢任何帮助。

Answer 1

您有 CSV 数据。使用 csv module 它会在需要的地方自动使用引号：

import csv
valList = ['1', 'Age', ' Address has spaces', 'employee', '98363', 'hobbies has space in it ']
with open('sample.txt', 'wb') as file:
    writer = csv.writer(file)
    writer.writerow(valList)

这将根据需要引用值；例如，当字段值中有逗号或换行符时。这不太符合您的确切要求，但兼容的 CSV reader 将能够在读取时再次从文件中获取完全相同的值。

如果您必须在带有 space 的列上加上引号，您可以禁用自动引号并手动添加引号：

import csv
valList = ['1','Age',' Address has spaces','employee','98363','hobbies has space in it ']
with open('sample.txt', 'wb') as file:
    writer = csv.writer(file, quoting=csv.QUOTE_NONE, quotechar='')
    writer.writerow(['"{}"'.format(v) if ' ' in v else v for v in valList])

列表推导式将值中带有 space 的任何内容用双引号括起来。请注意，因为我们在此处禁用引用，所以 逗号或换行符 的值将被 csv.writer() 拒绝，因为它现在无法引用它们。

两种方法的演示：

>>> import sys
>>> import csv
>>> valList = ['1', 'Age', ' Address has spaces', 'employee', '98363', 'hobbies has space in it ']
>>> writer = csv.writer(sys.stdout)
>>> writer.writerow(valList)
1,Age, Address has spaces,employee,98363,hobbies has space in it
>>> writer = csv.writer(sys.stdout, quoting=csv.QUOTE_NONE, quotechar='')
>>> writer.writerow(['"{}"'.format(v) if ' ' in v else v for v in valList])
1,Age," Address has spaces",employee,98363,"hobbies has space in it "

Answer 2

valList = ['1','Age',' Address has spaces','employee','98363','hobbies has space in it ']

file = open('sample.txt', 'w')
for item in valList:
    if ' ' in item:
        file.write('"%s",' % item)
    else:
        file.write("%s," % item)

输出

1,Age," Address has spaces",employee,98363,"hobbies has space in it ",

通过向带空格的字符串添加双引号将值写入 python 中的文件

Write values to a file in python by adding double quotes to the string with spaces

python

file-format

file