将列表元素添加到多行字符串

Question

I'm trying to write a function that automatically sets up a HTML file using information from a list I've generated. This chunk below is part of a multi-line string.

`"""...
<tr>
  <td>10</td>
  <th>"""+str(List_Data[9])+"""</th>
  <th>"""+str(Extra_Data[9])+"""</th>
</tr>
</table>
..."""`

Extra_Data is a list of number ratings, so Extra_Data[9] = 7.2. When I run the code I get the following error;

`<th>"""+str(Extra_Data[9])+"""</th>
TypeError: can only concatenate str (not "list") to st`

I'm not sure how else I could get this to work since str(Extra_Data[9]) doesn't do the trick and this is the only way I can think to get all of my listed data to be apart of the HTML code efficiently. Any help would be appreciated!

Thanks in advance.

Answer 1

Python has the really handy string formatting method .format() , take a look here . All you'd need to do is something along the lines of:

a = """
<tr>
  <td>10</td>
  <th>{0}</th>
  <th>{1}</th>
</tr>
</table>
""".format(List_Data[9], Extra_Data[9])

print a

The numbers in swirly brackets {n} are the placeholders for the argument at the nth index of the .format() function.

To take this one step further, you could iterate over your data lists to create each row programatically:

Table_Array = list()

for index, value in enumerate(List_Data):
    Table_Array.append("""
                       <tr>
                           <td>{0}</td>
                           <th>{1}</th>
                           <th>{2}</th>
                       </tr>
                       """.format(index, List_Data[index], Extra_Data[index])

Answer 2

So, in my crazy attempts to solve this issue. I changed the line to this; <th>"""+str(float(Extra_Data[9]))+"""</th> and then it worked. I have no idea why so I changed it back to the original line and then it continued to work. I am so very confused as to why this has happened but as it stands now, my code works and it's the same as it did when it didn't work. I'm not sure why or how.