更好的方法：myPage + ='more html'，... [英] better way than: myPage += 'more html' , ...
问题描述
大家好，
我有一个python cgi程序，它使用print语句编写html。
程序已经增长，并且由于我赢了的原因我不知道，我需要
用字符串构建页面并打印它立刻。
我记得在某个地方读过连续构建字符串
" + ="声明是低效的，但我不知道任何其他选择，并且我的搜索尝试空了。有没有比这更好，更有效的方式
：
＃--------------- ------------------
htmlPage ="< html>< header>< / header>< body>"
htmlPage + =" more html"
....
htmlPage + ="更多html"
....
htmlPage + ="< / body>< / html>"
print htmlPage
＃ -------------------------------------
谢谢，Gobo
Hi everyone,
I have a python cgi program that uses print statements to write html.
The program has grown, and for reasons I won''t bore you with, I need to
build the page in a string and "print" it at once.
I remember reading somewhere that building the string with successive
"+=" statements is inefficient, but I don''t know any alternatives, and
my search attempts came up empty. Is there a better, more efficient way
to do it than this:
#---------------------------------
htmlPage = "<html><header></header><body>"
htmlPage += "more html"
....
htmlPage += "even more html"
....
htmlPage += "</body></html>"
print htmlPage
#-------------------------------------
Thanks, Gobo
推荐答案
Gobo Borz写道：
Gobo Borz wrote:
我记得在哪里读过建筑的连续的字符串
" + ="声明是低效的，但我不知道任何其他选择，并且我的搜索尝试是空的。是否有更好，更有效的方式来做到这一点：
＃----------------------- ----------
htmlPage ="< html>< header>< / header>< body>"
htmlPage + =" more html"
...
htmlPage + ="更多html"
...
htmlPage + ="< / body>< / html>"
print htmlPage
＃-------------------------------------
I remember reading somewhere that building the string with successive
"+=" statements is inefficient, but I don''t know any alternatives, and
my search attempts came up empty. Is there a better, more efficient way
to do it than this:
#---------------------------------
htmlPage = "<html><header></header><body>"
htmlPage += "more html"
...
htmlPage += "even more html"
...
htmlPage += "</body></html>"
print htmlPage
#-------------------------------------
最好做点赞/
＃--------------------- ------------
htmlbits = []
htmlbits.append（"< html>< header> < / header>< body>"）
htmlbits.append（" more html"）
＃...
htmlbits.append（甚至更多html）
＃...
htmlbits.append（"< / body>< / html>"）
＃现在为非直观位
打印" .join（htmlbits）
＃------------------ ---------------
HTH，
-
alan kennedy
--------------------------------------- --------------
在这里检查http标头： http://xhaus.com/headers
电子邮件alan： http://xhaus.com/mailto/alan
Gobo Borz写道
Gobo Borz wrote
我记得在某个地方用连续的
" + ="来构建字符串。声明是低效的，但我不知道任何其他选择，并且我的搜索尝试是空的。是否有更好，更有效的方式来做到这一点：
＃----------------------- ----------
htmlPage ="< html>< header>< / header>< body>"
htmlPage + =" more html"
...
htmlPage + ="更多html"
...
htmlPage + ="< / body>< / html>"
print htmlPage
＃-------------------------------------
I remember reading somewhere that building the string with successive
"+=" statements is inefficient, but I don''t know any alternatives, and
my search attempts came up empty. Is there a better, more efficient way
to do it than this:
#---------------------------------
htmlPage = "<html><header></header><body>"
htmlPage += "more html"
...
htmlPage += "even more html"
...
htmlPage += "</body></html>"
print htmlPage
#-------------------------------------
相反，建立一个字符串列表，然后将它们全部加在
结束 - 这样，系统只需要分配
空格一次。更快。
＃---------------------------------
htmlPage = []
htmlPage.append（"< html>< header>< / header>< body>"）
htmlPage.append（" more html"）
...
htmlPage.append（甚至更多html）
...
htmlPage.append（"< / body>< / html>"）
page =''''。join（htmlPage）
打印页面
＃------------------------------- ------
Anthony
Instead, build up a list of strings, then join them all at
the end - this way, the system only has to allocate the
space once. Much quicker.
#---------------------------------
htmlPage = []
htmlPage.append("<html><header></header><body>")
htmlPage.append("more html")
...
htmlPage.append("even more html")
...
htmlPage.append("</body></html>")
page = ''''.join(htmlPage)
print page
#-------------------------------------
Anthony
2003年6月25日星期三下午5:20，Gobo Borz写道：
On Wednesday 25 Jun 2003 5:20 pm, Gobo Borz wrote:
大家好，
我有一个python cgi程序，它使用print语句编写html。
程序已经增长，并且由于我赢得了原因没有你，我需要用字符串构建页面并打印。它马上就读了。
我记得在某个地方用连续的
" + ="来构建字符串。声明是低效的，但我不知道任何其他选择，并且我的搜索尝试是空的。是否有更好，更有效的方式来做到这一点：
＃----------------------- ----------
htmlPage ="< html>< header>< / header>< body>"
htmlPage + =" more html"
...
htmlPage + ="更多html"
...
htmlPage + ="< / body>< / html>"
print htmlPage
＃-------------------------------------
<谢谢，Gobo
Hi everyone,
I have a python cgi program that uses print statements to write html.
The program has grown, and for reasons I won''t bore you with, I need to
build the page in a string and "print" it at once.
I remember reading somewhere that building the string with successive
"+=" statements is inefficient, but I don''t know any alternatives, and
my search attempts came up empty. Is there a better, more efficient way
to do it than this:
#---------------------------------
htmlPage = "<html><header></header><body>"
htmlPage += "more html"
...
htmlPage += "even more html"
...
htmlPage += "</body></html>"
print htmlPage
#-------------------------------------
Thanks, Gobo
一个简单的方法，只需要很少的修改就可以使用
列表并将其连接成一个字符串最后一口气：
----------- 8< --------------
htmlPage = ["< html>< header>< / header>< body> \ n"]
htmlPage.append（" more html \\\
" ;）
....
htmlPage.append（" more html \ n"）
....
htmlPage.append（"< \ body>< \html> \ n"）
h tmlDoc ="" .join（htmlPage）
----------- 8< --------------
这样效率更高，因为字符串连接都是在同一时间完成的，而不是以小块为单位。
希望有所帮助
-andyj
An easy way, which requires little changes tou your code would be to use a
list and join it up into a string in one go at the end:
-----------8<--------------
htmlPage=["<html><header></header><body>\n"]
htmlPage.append("more html\n")
....
htmlPage.append("more html\n")
....
htmlPage.append("<\body><\html>\n")
htmlDoc="".join(htmlPage)
-----------8<--------------
This is more efficient, as the string joining is done all at the same time,
rather than in little chunks.
hope that helps
-andyj
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