Python's first step: rejection is the first step of growth

Python's first step: rejection is the first step of growth

Install python 2.7

Environment: Run python in cmd to run the code. To run the py file, run python test. py in the command line. Remember to add python to the environment variable in windows.

Learn the basic syntax:

Note: #. Comment three single quotes or three double quotes on multiple lines.

Variable:

Normal: a = 3 or multiple variables are assigned a, B, c = 1, 2, "john"; string type variables are powerful:If you want to obtain a substring, you can use the variable [header Subscript: tail subscript] to extract the corresponding string, where the subscript starts from 0, it can be a positive or negative number, and the subscript can be null to get the header or tail.

This is the character in the string.

List: It looks like a json string. Well, this is the first time we use it.

List1 = ['physics ', 'chemistry', 1997,200 0]; subscript like array is correct

Condition determination: if a> 0: braces are replaced by colons.