Python basics 2. python Basics

Python basics 2. python Basics

Iii. Analysis of variables, objects and values

1. If you don't remember it, it will be finished.

1.1 remember: all data is an object

1.2 remember: all variables are references to data objects.

1.3 analysis: reference count sys. getrefcount in python

2. variable naming rules

2.1 remember what you can do. It must start with a letter.

2.2 remember what you cannot do. You cannot use keywords.

2.3 The most reasonable combination: the file name is lower case, the variable is lower case, and the function name is lower case. _ Make the variable clearer.

2.4 case sensitive.

3. assign values

3.1 remember dynamic features.

More than 3.2 values are assigned.

3.4 Delete.

4. Life

1. The three built-in functions must be well-developed. Type, help, dir.

2. Use built-in methods to learn str objects.

3. I have to deal with a string with a bad ending and a strange space at the beginning. What should I do.

4. self-taught.