实验四 函数和异常处理应用编辑

def func(a,b,c,/,*,d,e,f):
    return([a,b,c,d,e,f])
print(func(1,2,3,d=4,e=5,f=6))

def solve(a,b,c):
    '''
    求解一元二次方程,返回方程的两个根
    :para:a,b,c:int方程系数
    :return:tuple
    '''
    delta=b*b-4*a*c
    delta_sqrt=abs(delta)**0.5
    p1=-b/2/a;
    p2=delta_sqrt/2/a
    if delta>=0:
        root1=p1+p2
        root2=p1-p2
    else:
        root1=complex(p1,p2)
        root2=complex(p1,-p2)
    return root1,root2
print(solve.__doc__)
while True:
    try:
        a,b,c=eval(input('Enter eqution coefficient:'))
        if a==0:
            raise
    except:
        print('invalidinput,or,aiszero')
        break
    else:
        root1,root2=solve(a,b,c)
        print(f'root1={root1:.2f},root2={root2:.2f}')
        print()

def list_generator(a,b,c=1):
    t=list()
    if c==int(c):
        for i in range(a,b+1,c):
            t.append(i)
        return(t)
    else:
        if 0<c<1:
            for i in range(a,b+1):
                t.append(i+c)
            return(t)
        else:
            for i in range(a,b+1,int(c)):
                t.append(i+c-int(c))
            return(t)
list1=list_generator(-5,5)
print(list1)
list1=list_generator(-5,5,2)
print(list1)
list1=list_generator(1,5,0.5)
print(list1)

 

def is_prime(n):
    i=2
    while(i<=n):
        if n%i!=0:
            i=i+1
        else:
            if i==n:
                return True
            else:
                return False

for i in range(2,21,2):
    for j in range(2,i):
        if is_prime(i-j) and is_prime(j):
            print(f'{i}={j}+{i-j}')
            break

def encoder(text:str):
    
    ans=[]
    for n in text:
        x=ord(n)
        if 65<=x<=90:
            
            ans.append(chr((x-60)%26+65))
        elif 97<=x<=122:
            ans.append(chr((x-92)%26+97))
        else:
            ans.append(n)
    return ''.join(ans)
 
def decoder(text1):
    ans1=[]
    for n in text1:
        x1=ord(n)
        if 65 <= x1 <= 90:
            ans1.append(chr((x1 - 44) % 26 + 65))
        elif 97 <= x1 <= 122:
            ans1.append(chr((x1 - 76) % 26 + 97))
        else:
            ans1.append(n)
    return ''.join(ans1)



text=input('输入英文文本:')
text1=encoder(text)
print(f'编码后的文本:{text1}')
print(f'解码后的文本:{decoder(text1)}')

def collatz(n):
    if n%2==0:
        return n/2
    else:
        return 3*n+1
try:
    n=eval(input('Enter a positive integer:'))
    if type(n)!=int or n<=0:
        raise ValueError and NameError
except ValueError and NameError:
    print('Error: must be a positive integer')
else:
    list=[n]
    while n!=1:
        n=collatz(n)
        list.append(n)
    print(list)