实验四

task1.py

print(sum)
sum=42
print(sum)

def inc(n):
    sum=n+1
    print(sum)
    return sum

sum=inc(7)+inc(7)
print(sum)

task2_1.py

def func1(a,b,c,d,e,f):
    return[a,b,c,d,e,f]

def func2(a,b,c,*,d,e,f):
    return[a,b,c,d,e,f]

def func3(a,b,c,/,d,e,f):
    return[a,b,c,d,e,f]

print(func1(1,9,2,0,5,3))
print(func1(a=1,b=9,c=2,d=0,e=5,f=3))
print(func1(1,9,2,f=3,d=0,e=5))

print(func2(11,99,22,d=0,e=55,f=33))
print(func2(a=11,b=99,c=22,d=0,e=55,f=33))

print(func3(111,999,222,0,555,333))
print(func3(111,999,222,d=0,e=555,f=333))

task2_2.py

list1=[1,0,8,4]
print(sorted(list1))
print(sorted(list1,reverse=True))
print(list1,True)

 task2_3.py

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))

task3.py

def solve(a,b,c):
    delta=b**2-4*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

while True:
    try:
        t=input('输入一元二次方程系数a,b,c,或者输入#结束：')
        if t=='#':
            print('结束计算，退出')
            break
        a,b,c=map(float,t.split())
        if a==0:
            raise ValueError('a=0,不是一元二次方程')
    except ValueError as e:
        print(repr(e))
        print()
    except:
            print('有其他错误发生\n')
    else:
            root1,root2=solve(a,b,c)
            print(f'root1={root1:.2f},root2={root2:.2f}')
            print()

task4.py

def list_generator(x,y,s=1):
    l = []
    while x<=y:
        l.append(x)
        x = x+s
    return l

list1 = list_generator(-5, 5)
print(list1)

list2 = list_generator(-5, 5, 2)
print(list2)

list3 = list_generator(1, 5, 0.5)
print(list3)

task5.py

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

s=[]
for i in range(2,20):
    if is_prime(i)==True:
        s.append(i)
print(s)

for i in range(2,21,2):
    if i%2==0:
        for j in s:
            if (is_prime(j)and is_prime(i-j) and(j<=(i-j))):
                print(f'{i}={j}+{i-j}')

 task6.py

def encoder(n1):
    s1 = []
    s2 = []
    for i in range(97, 123):
        s1.append(chr(i))
    for i in range(65, 91):
        s2.append(chr(i))
    n=list(n1)
    i=0
    while i<len(n):
        if n[i] in s1:
            if ord(n[i])<=117:
                n[i]=chr(ord(n[i])+5)
            else:n[i]=chr(ord(n[i])+5-26)
        if n[i] in s2:
            if ord(n[i])<=85:
                n[i]=chr(ord(n[i])+5)
            else:n[i]=chr(ord(n[i])+5-26)
        i+=1
    return ''.join(n)

def decoder(n2):
    s1 = []
    s2 = []
    for i in range(97, 123):
        s1.append(chr(i))
    for i in range(65, 91):
        s2.append(chr(i))
    n = list(n2)
    i = 0
    while i < len(n):
        if n[i] in s1:
            if ord(n[i])>=102:
                n[i] = chr(ord(n[i])-5)
            else:
                n[i] = chr(ord(n[i])-5+26)
        if n[i] in s2:
            if ord(n[i])>=46:
                n[i] = chr(ord(n[i])-5)
            else:
                n[i] = chr(ord(n[i])-5+26)
        i += 1
    return ''.join(n)

for i in range(2):
    title='Remote Interpreter Reinitialized'
    print(title.center(60,'*'))
    text=input('输入英文文本：')
    encoded_text=encoder(text)
    print(f'编码后的文本：{encoded_text}')
    decoded_text=decoder(encoded_text)
    print(f'对编码后文本解码：{decoded_text}')

 task7.py

def collatz(n):
    if n%2==0:
        return int(n/2)
    elif n%2!=0:
        return n*3+1

for i in range(5):
    title='Remote Interpreter Reinitialized'
    print(title.center(60,'*'))
    num=input('Enter a positive integer:')
    if num.isalpha()==True:
        print('Error:must be a positive interger')
    if num.isdigit()==True:
        num=eval(num)
        if type(num)!=int or num<=0:
            print('Error:must be a positive interger')
        else:
            ans = []
            ans.append(num)
            while num!=1:
               num=collatz(num)
               ans.append(num)
        print(ans)

 task8.py

def func(n):
    def func1(n):
        if n==0:
            return 1
        return 2*func1(n-1)
    return func1(n)-1

while True:
    x = input()
    if x == '#':
        print('计算结束')
        break
    n = int(x)
    ans = func(n)
    print(f'n = {n}, ans = {ans}')