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The organizational structure of the program

Sequential structure

The program executes the code from top to bottom without any judgment or jump until the end of the program.

The Boolean value of the object

Everything in Python is an object, and all objects have a Boolean value

Use the built-in function bool () to get the Boolean value of the object

You can judge the Boolean value of the object directly in the conditional expression.

The Boolean value of the following object is False

False

Numeric value 0

None

Empty string

Empty list

Empty tuple

Empty dictionary

Empty set

The Boolean values of the above objects are False. All other object Boolean values are True.

Select structure

The program selectively executes part of the code according to the Boolean value of the judgment condition.

Clearly let the computer know under what conditions and what to do

Single branch structure

Chinese semantic: if. Just...

Grammatical structure:

If conditional expression: conditional executor

Small experiment money=1000 # balance s=int (input ('Please enter the withdrawal amount') # withdrawal amount # determine whether the balance is sufficient if money > = s: money=money-s print ('withdrawal successful, balance:', money)

Double branch structure

Chinese semantics

If. Not satisfied. Just.

Grammatical structure

If conditional expression: conditional executor 1 else: conditional executor 2

Small experiment num = int (input ('please enter an integer')) # conditional judgment if num%2==0: print (num,' is even') else: print (num,' is odd')

Multi-branch structure

Chinese semantics:

Is the score above 90? No

Is the score between 80 and 90? No

Is the score between 70 and 80? No

Is the score between 60 and 70? No

Is the score below 69? Yes

Grammatical structure:

If conditional expression: conditional executor

Small experiment money=1000 # balance s=int (input ('Please enter the withdrawal amount') # withdrawal amount # determine whether the balance is sufficient if money > = s: money=money-s print ('withdrawal successful, balance:', money)

The unique way of writing python code

Python code can be written mathematically.

If 90

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