Article directory
Documentation for the function
1. Basic use
def test(a, b):
"用来完成对2个数求和" # 函数第一行写一个字符串作为函数文档
print("%d"%(a+b))
test(11, 22) # 函数可以正常调用
Output result:
33
help(test) # 使用 help 查看test函数的文档说明
Output result:
Help on function test in module __main__:
test(a, b)
用来完成对2个数求和
2. Advanced usage
def get_info(name: str, age: int):
"""
接收用户的名字和年龄，拼接一个字符串并返回
:param name: 接收一个名字
:param age: 接收用户的年龄，必须是 0-200 间的一个整数
:return: 返回拼接好的字符串
"""
return "我的名字叫 %s，今年是 %d 岁" % (name, age)
get_info("吴彦祖", 19)
get_info(520, 19) # 注意，形参上标注的类型只是提高代码的可读性，并不会限制实参的类型
help(get_info)
Output result:
Function app: printing graphs and math calculations
Target
- Feel the nested call of the function
- Feel the idea of program design, decompose complex problems into simple ones
Think & Realize 1
Write a function to print a horizontal line
Print a horizontal line with a custom number of lines
Reference code 1
# 打印一条横线
def printOneLine():
print("-"*30)
# 打印多条横线
def printNumLine(num):
i=0
# 因为printOneLine函数已经完成了打印横线的功能，
# 只需要多次调用此函数即可
while i<num:
printOneLine()
i+=1
printNumLine(3)
Think & Realize 2
Write a function to find the sum of three numbers
Write a function to find the average of three numbers
Reference code 2
# 求3个数的和
def sum3Number(a,b,c):
return a+b+c # return 的后面可以是数值，也可是一个表达式
# 完成对3个数求平均值
def average3Number(a,b,c):
# 因为sum3Number函数已经完成了3个数的就和，所以只需调用即可
# 即把接收到的3个数，当做实参传递即可
sumResult = sum3Number(a,b,c)
aveResult = sumResult/3.0
return aveResult
# 调用函数，完成对3个数求平均值
result = average3Number(11,2,55)
print("average is %d"%result)
nested function calls
def testB():
print('---- testB start----')
print('这里是testB函数执行的代码...(省略)...')
print('---- testB end----')
def testA():
print('---- testA start----')
testB()
print('---- testA end----')
testA()
Output result:
---- testA start----
---- testB start----
这里是testB函数执行的代码...(省略)...
---- testB end----
---- testA end----
Small summary:
-
A function calls another function, which is the so-called function nested call
-
If another function B is called in function A, then the tasks in function B will be executed before returning to the position where function A was executed last time.
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