a second channel operating python question is a relatively simple questions, and the first question is investigated as the knowledge of the string
The main processing method will examine the string, the string sections or the like
Treatment often test string
str.lower () : Returns a string copy all lowercase characters
upper (): On the contrary, all uppercase characters
str.split ( ""): constitute a partial list of character segmentation in parentheses ( !!! very important method, must be used)
str.replace (old, new): Returns a copy of the string, the string in the old sub-string of new replacement string sub
Detailed sections of the string
NOTE: string index is zero
Use slices: <string or string variable> [n: m]
Get String substring sections from n to m (not included m) of
Requirements slice n and m are both in the index section of the string, if m <= n null string is returned
Reverse same time decreasing number starting at -1
Reverse output will learn little knowledge
Print (s :: [--1]) represents an output reverse output string s
Calculating the string length len (str)
print () function when the default text output a newline added at the end, if you do not wrap, can print) end function parameter assignment (using the following method
print (<output content to be>, end = "") ps: add a space after the outputting content
