python - 截断 Mako 模板中的字符串

Question

我想找到一种方法来截断标题(如果太长)，如下所示:

'this is a title'
'this is a very long title that ...'

有没有办法在mako中打印字符串，并在大于一定数量的字符时自动用“...”截断？

谢谢。

Answer 1

基本的Python解决方案:

MAXLEN = 15
def title_limit(title, limit):
    if len(title) > limit:
        title = title[:limit-3] + "..."
    return title

blah = "blah blah blah blah blah"
title_limit(blah) # returns 'blah blah bla...'

这只会减少空格(如果可能的话)

def find_rev(str,target,start):
    str = str[::-1]
    index = str.find(target,len(str) - start)
    if index != -1:
        index = len(str) - index
    return index

def title_limit(title, limit):
    if len(title) <= limit: return title
    cut = find_rev(title, ' ', limit - 3 + 1)
    if cut != -1:
        title = title[:cut-1] + "..."
    else:
        title = title[:limit-3] + "..."
    return title

print title_limit('The many Adventures of Bob', 10) # The...
print title_limit('The many Adventures of Bob', 20) # The many...
print title_limit('The many Adventures of Bob', 30) # The many Adventures of Bob