实验4

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)

line1：内置函数
line3：赋值给予的数
line7：局部变量
line11：全局变量

list1 = [1, 9, 8, 4]

print( sorted(list1) )
print( sorted(list1, reverse=True) )
print( sorted(list1, True) )

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('invalid input, or, a is zero')
break
else:
root1, root2 = solve(a, b, c)
print(f'root1 = {root1:.2f}, root2 = {root2:.2f}')
print()

def list_generator(a,b,c=1):
list = []
while a <= b:
list.append(a)
a += c
return list

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

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

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

def is_prime(n):
if n < 2:
return False
for i in range(2,int(n**0.5)+1):
if n % i == 0:
return False
return True

for x in range(2,21,2):
for y in range(2,x):
if is_prime(x-y) is True:
print(f'{x} = {y} + {x-y}')
break

def encoder(a):
list = []
for i in a:
a1 = ord(i)
if 65 <= a1 <= 85 or 97 <= a1 <= 117:
a1 += 5
elif 85 <= a1 <= 90 or 118 <= a1 <= 122:
a1 -= 21
a2 = chr(a1)
list.append(a2)
return ''.join(list)

def decoder(b):
list = []
for v in b:
b1 = ord(v)
if 65 <= b1 <= 69 or 97 <= b1 <= 101:
b1 += 21
elif 70 <= b1 <= 90 or 102 <= b1 <= 122:
b1 -= 5
b2 = chr(b1)
list.append(b2)
return ''.join(list)

x = input('输入英文文本: ')
t = encoder(x)
print(f'编码后的文本: {t}')
z = decoder(t)
print(f'对编码后的文本解码: {z}')

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

try:
x = int(input('Enter a positive integer: '))
z = [x]
if x <= 0:
raise ValueError
while True:
y = collatz(x)
z.append(y)
x = y
if x == 1:
break
print(z)
except ValueError:
print('Error: must be a positive integer')

posted on 2022-05-07 19:34  好运来。  阅读(11)  评论(2编辑  收藏  举报