Learn python the hard way

• this task didn't use % to insert the variable value into a string, but a , to insert the different values in print function

• the first task to introduce %, the formatter character, the commonly used formatters including %r %s %d, the difference between %r %s is in ex09
• ex07 introduced some high-level use of formatters

• escape sequence introduction, some I don't know how to work
• ex10extra a cool visual effect, but I don't know how it works right now

• first task to introduce raw_input

• first task to import argv from sys
• notice the input style when using the argv
• notice the combination of raw_input with argv

• read a file, file.read()
• open a file and assign to a variable
• when use w mode, there is no need to truncate the file after

• copying data from one file to another

• define a function, *args in the ex18
• read certain line in a file
• set the position in the file
• position changes while the reading goes

the 1st little game with loops and if/else loop could use in string, list, dict and so on find out a good way to judge whether the input is a number at all