Python first day

1.NAME.PYC is a bytecode file, similar to a DLL file in C #. Where code is executed in the following order: code----bytecode---machine code

Python files in the process of performing the first comparison between the m.py file and the M.pyc file, if the two files are the same, priority to execute bytecode files, if different, first convert the m.py file to the corresponding bytecode file, and then execute the bytecode file.

2.if name== "Zhangsan" value compare if Name is "Zhangsan" memory contrast

3. Placeholder

(1) name = ' I am%s ', age%d '% (' ss ', "a") equivalent to name = ' I am%s ', age%d ' name% (' Alex ', 73 ') ""I Am SS, age "

(2) name= "I am {0}, age {1}" Name.format ("Alex", 123)

Python first day