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Does Python optimize tail recursion?
...tracebacks:
Tail Recursion Elimination (2009-04-22)
Final Words on Tail Calls (2009-04-27)
You can manually eliminate the recursion with a transformation like this:
>>> def trisum(n, csum):
... while True: # Change recursion to a while loop
... if n == 0:...
Command to get nth line of STDOUT
...ssage:
ls -l | sed -n -e '2{p;q}'
I've seen that often enough that I usually use the first (which is easier to type, anyway), though ls is not a command that complains when it gets SIGPIPE.
For a range of lines:
ls -l | sed -n 2,4p
For several ranges of lines:
ls -l | sed -n -e 2,4p -e 20,30...
Getting all types in a namespace via reflection
How do you get all the classes in a namespace through reflection in C#?
11 Answers
11
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Get file name from URL
.... E.g. "example.com/file.xml?date=2010-10-20"
– Luke Quinane
Aug 13 '13 at 5:14
18
FilenameUtils....
How to convert List to List?
... This will throw an exception if any of the strings are not actually ints. See the safe versions down below. stackoverflow.com/a/48712010/2340825
– BA TabNabber
Feb 9 '18 at 18:31
...
Error in plot.new() : figure margins too large, Scatter plot
... should be getting [1] 5.1 4.1 4.1 2.1 but then you tell me to chage it to all 1's?
– Herman Toothrot
May 27 '16 at 0:23
3
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How to convert a Django QuerySet to a list
...
Why not just call list() on the Queryset?
answers_list = list(answers)
This will also evaluate the QuerySet/run the query. You can then remove/add from that list.
...
Google Tag Manager 入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的tag可定制的地方很少。
Rule：
加载规则，默认的是，All pages规则，可以自己添加，以和Tag关联，决定在什么条件下，加载指定的tag。
Macro：
宏，预定义的名称键值对，默认有：event，referrer，url三个宏，宏可以应用在rule和ta...
git add only modified changes and ignore untracked files
...
Ideally your .gitignore should prevent the untracked ( and ignored )files from being shown in status, added using git add etc. So I would ask you to correct your .gitignore
You can do git add -u so that it will stage the modifi...
The identity used to sign the executable is no longer valid
...
i had to delete all certificates/profiles manually and also refresh everything on the Apple developer portal and download them again, but it worked.
– benka
Oct 30 '13 at 15:36
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