将列表转换为字符串 [英] Converting a list to a string

问题描述

我从一个文件中提取了一些数据，并想将其写入第二个文件.但我的程序返回错误:

I have extracted some data from a file and want to write it to a second file. But my program is returning the error:

sequence item 1: expected string, list found

这似乎是因为 write() 想要一个字符串，但它正在接收一个列表.

This appears to be happening because write() wants a string but it is receiving a list.

那么，关于这段代码，我如何将列表 buffer 转换为字符串，以便我可以将 buffer 的内容保存到 file2?

So, with respect to this code, how can I convert the list buffer to a string so that I can save the contents of buffer to file2?

file = open('file1.txt','r')
file2 = open('file2.txt','w')
buffer = []
rec = file.readlines()
for line in rec :
    field = line.split()
    term1 = field[0]
    buffer.append(term1)
    term2 = field[1]
    buffer.append[term2]
    file2.write(buffer)  # <== error
file.close()
file2.close()

推荐答案

尝试 <代码>str.join:

file2.write(' '.join(buffer))

文档说:

返回一个字符串，它是可迭代对象中字符串的串联.元素之间的分隔符是提供此方法的字符串.

Return a string which is the concatenation of the strings in the iterable iterable. The separator between elements is the string providing this method.

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