Python 函数与变量--习题19，learn python the hard way

本文链接：https://blog.youkuaiyun.com/Enbu_Yuan/article/details/56063327

本文通过一个简单的Python函数实例，展示了如何定义和调用函数，并介绍了五种不同的参数传递方式，包括直接使用数字、变量、数学表达式、数字结合变量以及用户输入。

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#coding=utf-8
def Total_number_of_students(boys, girls):
print "There are %d boys within the environment." % boys
print "There are %d girls within the environment.\n" % girls

#运行方式一:数字
print "Here's the most simple way to operate this function by using numbers"
Total_number_of_students(4, 5)

#运行方式二：变量
print "Here's another way to make the function works by working with arguments."
boys = 10
girls = 20
Total_number_of_students(boys, girls)

#运行方式三: 数学表达式
print "Here's another way to import numbers to functions"
Total_number_of_students(10 + 3, 10 + 4)

#运行方式四：数字+变量
print "Here's another way to make the function works."
Total_number_of_students(boys + 4, girls + 5)

#运行方式五：用户输入
print "Here's the fifth way to make the function meaningful by raw_input："
boys = int(raw_input("how many boys are there within the environment?"))
girls = int(raw_input("how many girls are there within the envrionment?"))
Total_number_of_students(boys, girls)

#运行方式六：用户输入2

Note:

1）def函数名是由：字符与下划线组成的。

2）函数名后面紧跟着（）

3）（）里面包含着参数，多个参数用逗号隔开，切不能使用重复的参数名。

4）函数名后面的（），紧跟着：

5）4个空格缩进后，编写该函数的代码。

6）用户在终端输入时的数字也是字符串，应该使用X = int(raw_input()) 来处理