Variable names can only contain letters, numbers, underscores
Only the beginning of the beginning letters or numbers can not contain spaces underscore can not be used with caution number 1 and the letter O
The effect of single and double quotation marks, like the freedom to choose who works outside outside
name.title () word capitalized
name.upper () all uppercase words
name.lower () word in all lowercase
+ Sign for splicing
\ T Tab
\ N newline
name.rstrip () deletes blank
input () a user input
print function must be bracketed in the python3, Python2 Some or without brackets
python can be performed directly on the integer arithmetic