python - 列表结束后删除逗号

Question

我正在尝试从 cvs 文件中读取并将输出写入 txt 文档：

import csv

reader = csv.reader(open('C:\Python33\excel.csv', newline=''), delimiter=' ', quotechar='|')
text_file = open("C:\Python33\output.txt", "w")
c = ", "

for row in reader:
    text_file.write(', '.join(row))
    text_file.write(c)

#reader.close()
text_file.close()

当前输出如下所示：

current: `beef, chicken, corn, cheese, yogurt, hippo,`

desired: `beef, chicken, corn, cheese, yogurt, hippo`

我想删除列表末尾的逗号，我正在考虑一个 if 语句来检查我是否在列表的末尾？但我不太确定该怎么做。

Answer 1

你只需要Remove the text_file.write(c) line.
它只是造成额外的逗号。

Answer 2

将所有行存储在一个列表中，然后将它们与join.

import csv

reader = csv.reader(open('C:\Python33\excel.csv', newline=''), delimiter=' ', quotechar='|')
text_file = open("output.txt", "w")

lines = []
for row in reader:
    lines.append(', '.join(row))

output = ", ".join(lines)
print(output)

结果：

beef, chicken, corn, cheese, yogurt, hippo