python - Editing .html files using Python?

Question

I want to delete everything from my html file and add <!DOCTYPE html><html><body>.

Here is my code so far:

with open('table.html', 'w'): pass
table_file = open('table.html', 'w')
table_file.write('<!DOCTYPE html><html><body>')

After i run my code, table.html is now empty. Why?

How can I fix that?

score 9 · Accepted Answer

看起来你没有关闭文件，第一行什么也没做，所以你可以做两件事。

跳过第一行并最后关闭文件：

table_file = open('table.html', 'w')
table_file.write('<!DOCTYPE html><html><body>')
table_file.close()

或者，如果您想使用该with语句，请执行以下操作：

with open('table.html', 'w') as table_file:
  table_file.write('<!DOCTYPE html><html><body>')
  # Write anything else you need here...

score 4 · Accepted Answer

with open('table.html', 'w'): pass 
   table_file = open('table.html', 'w')
   table_file.write('<!DOCTYPE html><html><body>')

这将打开文件 table.html 两次，并且您也没有正确关闭文件。

如果您与then 一起使用：

with open('table.html', 'w') as table_file: 
   table_file.write('<!DOCTYPE html><html><body>')

with在作用域之后自动关闭文件。

否则，您必须像这样手动关闭文件：

table_file = open('table.html', 'w')
table_file.write('<!DOCTYPE html><html><body>')
table_file.close()

而且您不必使用with运算符。

score 1 · Accepted Answer

我不确定你想用with open('table.html', 'w'): pass. 试试下面的。

with open('table.html', 'w') as table_file:
    table_file.write('<!DOCTYPE html><html><body>')

您当前没有关闭文件，因此不会将更改写入磁盘。

3 回答 3