Learning Python seventh day (character encoding, file processing)

A, a face questions

If the specified value is a variable type, then the value of one key will be added, deleted, modified some of the time value, the value will change all of the key. However, if the modified value is used for key assignment, only the change 
of the current value of the modified key 
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Second, the character encoding

 

# Knowledge Review 
"" " 
three core hardware 1. Run the program 
    cpu 
    memory 
    hard drive 

    of any order to run a program, you must first be loaded into memory, hard disk, memory and cpu to execute fetch 
    data running applications will be produced first there is a memory 

2.python py interpreter to run a file (xxx.py) step 
    1. the python interpreter code read from the hard disk memory 
    2. the memory read xxx.py ordinary text file 
    3.python read file content identification python syntax perform actions 
    ps: before an ordinary text editor and python interpreter two steps are the same 
. "" "