Mako 在有效代码上给出 SyntaxError？
我试图在 Mako 模板中使用一段代码，但无论我在代码块中放入什么，Mako 都坚持认为这是一个语法错误。
这是有问题的块的片段：
<td class="col_sm_space"> </td>
<%
if session.dist == "metric":
delta_distance = "%.2fkm" % (trk["d_distance"] / 1000.0)
delta_fuel = "%.2fl" % (trk["d_fuel"])
delta_co2 = "%.2fg" % (trk["d_co2"])
delta_co2_rate = "%.2fg/l" % trk["d_co2_rate"])
trip_av_speed = "%dkm/h" % int(trk["trip_av_speed"])
trip_peak_speed = "%dkm/h" % int(trk["trip_peak_speed"])
%>
<td class="col_field" title="${delta_distance}">${trk["trip_distance"]}</td>
我在 if session.dist == "metric": 行上收到语法错误，尽管我可以用任何内容替换它（例如 foo = "bar") 它仍然给我错误。
Mako 返回：
SyntaxException：(SyntaxError) 无效语法（第 5 行）('if session.dist == "metric":\\n delta_distance = ') in file '
第 271 行是开头 <%。显然，Char 9 将是下一行 if 的开头。
奇怪的是，我在其他页面上使用了完全相同的设置，而且这些设置都很好 - 只是这里不行。
我在这里遗漏了什么明显的东西吗？
I'm trying to use a block of code within a mako template, yet no matter what I put in the block, Mako is adamant it's a syntax error.
Here's a snippet of the block in question:
<td class="col_sm_space"> </td>
<%
if session.dist == "metric":
delta_distance = "%.2fkm" % (trk["d_distance"] / 1000.0)
delta_fuel = "%.2fl" % (trk["d_fuel"])
delta_co2 = "%.2fg" % (trk["d_co2"])
delta_co2_rate = "%.2fg/l" % trk["d_co2_rate"])
trip_av_speed = "%dkm/h" % int(trk["trip_av_speed"])
trip_peak_speed = "%dkm/h" % int(trk["trip_peak_speed"])
%>
<td class="col_field" title="${delta_distance}">${trk["trip_distance"]}</td>
I'm getting the syntax error on the if session.dist == "metric": line, although I could replace this with anything (Such as foo = "bar") and it still gives me the error.
Mako is returning:
SyntaxException: (SyntaxError) invalid syntax (line 5) ('if session.dist == "metric":\\n delta_distance = ') in file '<snipped>' at line: 271 char: 9\n, referer: <snipped>
Line 271 is the opening <%. Char 9 would be the beginning of the if on the next line, apparently.
Oddly, I'm using this exact same setup on other pages, and it's fine with those - just not here.
Anything glaringly obvious I'm missing here?
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评论（4）
我对此有过一次非常令人沮丧的经历。至少就我而言，错误报告是完全错误的。它指向一个 python 块的第一行，就像你的一样，而实际错误是在 50 行之后的另一个 python 块中。
很可能，你有一个简单的语法错误，比如错误的缩进或 if 语句后缺少冒号......我无法给你任何比用细齿梳理你的 python 更好的调试建议。如果可以在 Mako 之外对 python 块进行单元测试，那可能会有所帮助。
I had a really frustrating experience with this. In my case, at least, the error report was just completely wrong. It pointed to the first line of a python block, like yours, when the actual error was in a different python block, 50 lines later.
Likely, you have a simple syntax error like bad indentation or a missing colon after an if statement... I can't give you any better debugging advice than going through your python with a fine-toothed comb. If it's possible to unit-test your python blocks outside of Mako, that might be helpful.
我的经验是，我有这样的 if 语法：
相反，它应该是这样的：
希望这对某人有帮助。
My experience was that I had this if syntax:
Instead, it was supposed to be like this:
Hope this helps someone.
很久以前就有人问过这个问题，但根据记录，这一行缺少左括号“(”，尚不清楚这是否导致问题，但似乎有可能：
应该至少是：
This was asked a very long time ago but for the record there is a missing left paren, "(", on this line, its not clear if that is causing the problem but it seems likely:
Should be at least:
在mako模板中，
当你使用条件语句时，例如if、for等，它应该是这样的：
% if条件
一些代码
%endif
对于分配，你必须将那个东西嵌入
<% %>如果你遵循这个，你的代码将运行。
In mako templates,
when you are using a conditional statement eg if, for etc, it should be like this:
% if condition
some code
%endif
And for assigment, you have to embed that thing in
<% %>If you will follow this, your code will run.