Python 函數（五）

用書 PYTHON王者歸來 作者洪錦魁

裝飾器　Decorate

def lower(func):
    def myfuction(args):
        old =func(args)
        new =old.lower()
        print("function name:",func.__name__)
        print("function args:",args)
        return new
    return myfuction
def HI(s):
    return s

SayHI = lower(HI)

print(SayHI("How are you NINI?"))

執行結果

def lower(func):
    def myfuction(args):
        old =func(args)
        new =old.lower()
        print("function name:",func.__name__)
        print("function args:",args)
        return new
    return myfuction
@lower
def HI(s):
    return s

print(HI("How are you NINI?"))

執行結果

def checkerror(func):
    def myfunc(*args):
        if args[1]!=0:
            result =func(*args)
        else:
            retsult ="除數不為零"
        print("function name:",func.__name__)
        print("function args:",args)
        print("result:",result)
        return result
    return myfunc
@checkerror
def mymath(a,b):
    return a/b
print(mymath(3,2))
print(mymath(3,0))

執行結果

def lower(func):
    def myfuction(args):
        old =func(args)
        new =old.lower()
        print("function name:",func.__name__)
        print("function args:",args)
        return new
    return myfuction
def GO(func):
    def wrapper(args):
        return "------ " + func(args) + "-----"
    return wrapper
@GO
@lower
def HI(s):
    return s
print(HI("How are you NINI?"))

執行結果

把句點或問號變成空字元+計算出現次數

def modify_classmate_name(names):
    for name in names:
        if name in ".,?":
            names =names.replace(name," ")
    return names

def string_to_list(namecount):
    global mydict
    namelist = namecount.split()
    print("name list")
    mydict = {wd:namelist.count(wd) for wd in set(namelist)}

classmate_name =""" NINI,Susan Din? Orbi Kan,SISI, susi. Kan Orbi"""
mydict={}
name1 =modify_classmate_name(classmate_name.lower())
print(name1)

string_to_list(name1)
print(mydict)

執行結果

回應輸入數字是否為質數

def ismath(num):
    for n in range(2,num):
        if num % 2 == 0:
            return False
    return True

num = int(input("Please input a num:"))
if ismath(num):
    print("%d is 質數" %num)
else:
    print("%d is not 質數" %num)

執行結果

最大公約數

def greatest_common_divisor(n1,n2):
    greast = 1
    start = 2
    while start <= n1 and start <= n2:
        if n1 % start ==0 and n2 % start ==0:
            greast = start
        start += 1
    return greast

n1,n2 = eval(input("Please input 2 number:"))
print("greatest_common_divisor is:", greatest_common_divisor(n1,n2)) 

執行結果

輾轉相除法

def greatest_common_divisor(n1,n2):
    if n1< n2:
        n1,n2 = n2,n1
    while n2 !=0:
        tmp = n1 % n2
        n1 = n2
        n2 =tmp
    return n1
    
n1,n2 = eval(input("Please input 2 number:"))
print("greatest_common_divisor is:", greatest_common_divisor(n1,n2)) 

執行結果

遞迴函數處理歐幾里得演算法

def greatest_common_divisor(n1,n2):
    return n1 if n2 == 0 else  greatest_common_divisor(n2, n1%n2)

n1,n2 = eval(input("Please input 2 number:"))
print("greatest_common_divisor is:", greatest_common_divisor(n1,n2)) 

執行結果

最小公倍數

def greatest_common_divisor(n1,n2):
    return n1 if n2 == 0 else  greatest_common_divisor(n2, n1%n2)
def least_common_multiple(n1,n2):
    return n1*n2 // greatest_common_divisor(n1,n2)

n1,n2 = eval(input("Please input 2 number:"))
print("greatest_common_divisor is:", greatest_common_divisor(n1,n2)) 
print("least_common_multiple:", least_common_multiple(n1,n2)) 

執行結果