python easy to learn, but learning to deep or hard, the key is to always remember when some function interface, the following blog even though this sort of a python knowledge of the language but also a record of some functions such as knowledge.
1. Variable simple data types
(1) variable naming conventions and usage
Variables can only consist of letters, digits, and underscores, and can not begin with a letter; can not be inside the python keywords and function names are named; recommended prior to underscore as a word connector, such as: name_nums; do not try to lowercase l and o; recommended lowercase variable names;