如何在Python函数中定义字符串？
我第一次使用 Python 和 Google App Engine，但无法在函数 (mytest2) 中定义字符串，声明后的行上出现缩进错误。我可以在有效的参数中定义一个（测试），但不明白为什么我也无法在函数中执行此操作。
我读了一些教程但没有获得启发。谁能让我知道我这里出了什么问题？
我还想知道如何通过在类中定义类似 mytest1 的内容然后在函数中访问来做到这一点？
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
class MainPage(webapp.RequestHandler):
#mytest1 = "test1"
#Runtime failure on this line talking about an indent issue
def get(self, test = 'testing!'):
mytest2= "test2" #Runtime failure on this line talking about an indent issue
self.response.headers['Content-Type'] = 'text/plain'
self.response.out.write('Hello, webapp World!\n')
self.response.out.write(self)
#self.response.out.write('\n' + mytest1)
self.response.out.write('\n' + mytest2)
application = webapp.WSGIApplication(
[('/', MainPage)],
debug=True)
def main():
run_wsgi_app(application)
if __name__ == "__main__":
main()
I'm playing with Python and Google App Engine for the first time but am unable to define a string within my function (mytest2), I get an indentation error on the line after the declaration. I can define one in the parameters that works (test) but can't see why I wouldn't be able to do it in the function aswell.
I've read a few tutorials without gaining enlightenment. Can anyone let me know what I've got wrong here?
I'm also wondering how I could do this by having something like mytest1 defined in the class and then accessible within the function?
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
class MainPage(webapp.RequestHandler):
#mytest1 = "test1"
#Runtime failure on this line talking about an indent issue
def get(self, test = 'testing!'):
mytest2= "test2" #Runtime failure on this line talking about an indent issue
self.response.headers['Content-Type'] = 'text/plain'
self.response.out.write('Hello, webapp World!\n')
self.response.out.write(self)
#self.response.out.write('\n' + mytest1)
self.response.out.write('\n' + mytest2)
application = webapp.WSGIApplication(
[('/', MainPage)],
debug=True)
def main():
run_wsgi_app(application)
if __name__ == "__main__":
main()
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评论（1）
永远不要在 python 中混合制表符和空格！
一般接受的做法是使用 4 个空格进行缩进。这是在 Python 风格指南 PEP 8 中编写的。我强烈推荐阅读它。
我通常将编辑器设置为用 4 个空格替换制表符，每个像样的文本编辑器都支持此操作。
制表符在您的示例中成为问题的原因是它们被最多 8 个空格替换，而您的缩进大部分为 4 个空格 (Python 文档)
Never mix tabs and spaces in python!
Generally accepted practice is to use 4 spaces for indentation. This is written in PEP 8 , the python style guide. I strongly recommmend reading it.
I usually set my editor to replace tabs with 4 spaces, every decent text editor supports this.
The reason why tabs are a problem in your example is that they are replaced by up to 8 spaces and your indentation is mostly 4 spaces (Python documentation)