如何在Python中更新现有的文本文件？

How do I update an existing text file in Python?

我有一个books.txt文件，其中包含书名、作者和价格如下：

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The Hunger Games,Suzanne Collins,12.97
The Fault In Our Stars,John Green,11.76
The Notebook,Nicholas Sparks,11.39

我把它排序成一个列表来得到：

1	[[The Hunger Games, Suzanne Collins, 12.97], [The Fault In Our Stars, John Green, 11.76], [The Notebook, Nicholas Sparks, 11.39]]

我使用的代码是：

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def booksDatabase():
for line in infile:
line = line.rstrip().split(",")
line[2] = float(line[2])
table.append(line)

infile = open("books.txt")

table = []

booksDatabase()

infile.close()

我想更新.txt文件，使其包含当前列表。如何在不导入任何库的情况下完成此操作？

事先谢谢。

更新：我尝试这样做：

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def booksDatabase():
for line in infile:
line = line.rstrip().split(",")
line[2] = float(line[2])
table.append(line)
outfile.write(line)

infile = open("books.txt")
outfile = open("books.txt", 'w')

table = []

booksDatabase()

infile.close()

但我得到了这个错误：

1 2	outfile.write(line) TypeError: write() argument must be str, not list

我做错什么了？