First, test, test
Decision-making, the program checks to make (to complete a test) to see if a certain condition is true.
Python completion of the test method is limited, and each test has only two possible answers: true (true) or false (false).
Complete the test and make judgments based on the results called the branch (branching). Program to determine which way the results of the test, or perform along which branch.
Block: is a line or multiple lines of code together.
Indent: is a line of code to the right a little bit.
Second, the indentation
Python, when writing code indentation is an essential part.
Python code block indentation will tell where to start, where to end.
Third, test symbols
==
Fourth, other types of tests
<, >, !=, >=, <=
Fifth, if the test is false
Sixth, use and
Seven, or use
Eight, the use not
IX Summary:
1, test and relational operators
2, and code blocks indented
3, use and end of the test and or
4, not reverse test