Think Python ：Chapter 5: Conditionals and Recursion 笔记

目录

这是麻省理工大学（MIT）官方编程教程中Python Tutorial的内容，教材为《Think Python: How to Think Like a Computer Scientist》。这是我的学习笔记，因为水品有限，请大家多多包涵。如果有一起学习的同学可以一起交流。如笔记中错误，请一定要告诉我啊，我肯定及时改正。所有笔记的目录详见：MIT：Python Tutorial目录

这是MIT官方编程教程中Python Tutorial中Using if, else, and while的内容。本篇博客为《 Think Python: How to Think Like a Computer Scientist》的第5章 Conditionals and Recursion的笔记内容。（Think Python ：Chapter 5: Conditionals and Recursion）

Python Tutorial[3]:Using if, else, and while

Before starting these problems, please read(学习材料):
- Think Python, Chapter 5: Conditionals and Recursion, through section 5.7
- Think Python, Chapter 7: Iteration

Chapter 5 Conditionals(条件语句) and recursion(循环递归语句)

5.1 Modulus operator(模数运算符)

modulus operator(模数运算符): An operator, denoted with a percent sign (%), that works on integers and yields the remainder(余数) when one number is divided by another.

5.2 Boolean expressions(布朗运算表达)

boolean expression: An expression whose value is either True or False.
relational operator: One of the operators that compares its operands: == , != , > , < , >= , and <=.
A common error is to use a single equal sign (=) instead of a double equal sign (==). Remember that = is an assignment operator and == is a relational operator. There is no such thing as =< or =>.(=代表数学任务运算,==代表相关运算)

5.3 Logical operators(逻辑运算)

logical operator: One of the operators that combines boolean expressions: and , or , and not .

5.4 Conditional execution(条件运算)

conditional statement: A statement that controls the flow of execution depending on some condition.
condition: The boolean expression in a conditional statement that determines which branch is executed.
compound statement: A statement that consists of a header and a body. The header ends with a colon (:). The body is indented relative to the header.

5.5 Alternative execution(可选择的运行方式)

branch: One of the alternative sequences of statements in a conditional statement.

#5.5 案例
if x%2==0:
    print(x+'is even')
else:
    print(x+'is odd')

5.6 Chained conditionals(链状条件语句)

chained conditional: A conditional statement with a series of alternative branches.

def compare_xy(x,y):
    i