python days3

Function returns

I do not know if you noticed, in the above code, we do three times factorial, this code is actually duplicate code. Programming guru Martin Fowler Mr. once said: " Code There are many bad taste, repetition is the worst kind! ", To write high-quality code first problem to be solved is to repeat the code. For the above codes, we can calculate the factorial function call encapsulated into a "function" function modules, where needed factorial calculation, we only need to "call" the "function" it

Defined Functions

Can be used in Python defkeyword to define functions and variables as each function also has a famous name, but naming naming rules are rules and variables are the same. Can be passed in parentheses after the function name placed to function parameters, function and math on this is very similar in function parameters of the program is equivalent to saying the mathematical argument of a function, and the function execution is complete we can by returnto return a key value, which is equivalent to saying that the dependent variable mathematical functions.

In the understanding of how to define a function, we can reconstruct the above code, the so-called reconstruction is without effect on the structure of the code to adjust the premise of code execution results.

Function parameters

Function is a code of the vast majority of programming languages are supported by the "building blocks", but the function of the Python language functions in the other there are still many not the same place, one significant difference is that Python for function parameters deal with. In Python, function parameters can have default values, but also supports the use of variable parameters, so Python does not need to support other languages like overloaded functions , we can make it because there are many different definitions of a function in time use

def hs():
    zhengshu = 0
    fushu = 0
    sum_ = 0
    cishu = 0
    data = 1
    while data !=0 :
        data = eval(input(">>"))
        if data > 0:
            zhengshu += 1
        if data < 0:
            fushu += 1
        sum_ += data
        if data != 0:
            cishu += 1

    print(zhengshu)
    print(fushu)
    print(sum_ / cishu)
def Start():
    hs()

Start()

def money():
    dorlla = 10000
    for i in range (14):
        dorlla = dorlla * 0.05 + dorlla
        if i == 9:
            print(dorlla)
    print(dorlla)
def Start():
    money()
Start()

def zc():
    count = 0
    for i in range(100,1001):
        if i % 5 == 0 and i % 6 == 0:
            print(i,end=" ")
            count =1
            if count % 10 ==0:
                print()
def Start():
    zc()
Start()

1.def num1():
    n = 0
    while n ** 2 < 12000:
        n +=1
    print(n)
def Start():
    num1()
Start()

2.def num2():
    n = 0
    while n ** 3 <12000:
        n +=1
    print(n-1)
def Start():
    num2()
Start()

def num2():
    Money = 10000
    lilv = 5
    nian = 5
    for i in range(24):
        M = Money * lilv / 100
        T = 12 * M * nian
        print(lilv,'%','月利率',M,'总和',T)
        if lilv == 5.25:
            print('.....')
        lilv += 1/8
def Start():
    num2()
Start()

def num2():
    res = 0
    for i in range(50000,0,-1):
        res += 1/i
    print(res)
def Start():
    num2()
Start()

2.def num2():
    res = 0
    for i in range(1,50001,1):
        res += 1/i
    print(res)
def Start():
    num2()
Start()

def num2():
    res = 0
    for i in range(1,98,2):
        res += i/ (i+2)
    print(res)
def Start():
    num2()
Start()

def num2():
res = 0
for i in range(1,100000):

        res += 4*((-1)**(i+1)/(2*i-1))
    print(res)
def Start():
    num2()
Start()

Function returns

Defined Functions

Function parameters

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