dspjm questions

• Why trap didn't work in a pipeline
• What is the difference between super(cls, instance) and super(cls, subclass)?
• where is /usr/include/unistd.h and limit.h from, glibc or kernel
• Can we modify limits.h? Would it render any effect?
• Why can s command of sed can be followed by a comma?
• Django: how to add http header to responses in a convenient way?
• what is super(type) in python?
• How to read xlsx file uploaded in django?
• Is it better to use self variable than pass variable in a class? [closed]
• how is a memory barrier in linux kernel is used

dspjm answers