Install htop on CentOS from source:

htop is a real-time process viewer for Linux. First, install prerequisites and download the source:

yum groupinstall "Development Tools"
 yum install ncurses-devel
 wget http://hisham.hm/htop/releases/2.0.2/htop-2.0.2.tar.gz
 tar xvfvz htop-2.0.2.tar.gz
 cd htop-2.0.2/

Prepare for compilation:

./configure

By default, htop will be installed under /usr/local/bin. If you want to change installation location to something else (e.g., /usr/ bin`), run configure script with `--prefix option instead. For example:

./configure --prefix=/usr

build and install htop as follows:

make
 make install

Voila! You're done. just run it using:

htop

#linux #centos #htop #compile #source #install

tuples vs list from a different point of view. Tuples of constants can be precomputed by Python's peephole optimizer or AST-optimizer. Lists, on the other hand, get built-up from scratch:

>>> from dis import dis 

>>> dis(compile("(10, 'abc')", '', 'eval'))
  1           0 LOAD_CONST               2 ((10, 'abc'))
              3 RETURN_VALUE   

>>> dis(compile("[10, 'abc']", '', 'eval'))
  1           0 LOAD_CONST               0 (10)
              3 LOAD_CONST               1 ('abc')
              6 BUILD_LIST               2
              9 RETURN_VALUE 

#python #list #tuple #performance #dis #compile #ast_optimizer