print(sum)
sum = 42
print(sum)
def inc(n):
sum = n+1
print(sum)
return sum
sum = inc(7) + inc(7)
print(sum)
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 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,f=33,e=55) )
print( func3(111, 999, 222, 0, 555, 333))
print( func3(111, 999, 222, d=0, e=555, f=333) )
list1 = [1, 9, 8, 4]
print( sorted(list1) )
print( sorted(list1, reverse=True) )
print( sorted(list1, True) )
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 is_prime(num):
if num>1:
for i in range(2,num//2+1):
if num%i==0:
return False
break
else:
return True
else:
return False
for a in range(0,21):
if a%2==0:
for i in range(2,a):
if is_prime(a-i):
print(f'{a}={i}+{a-i}')
break
def encoder(n):
list=[]
for i in n:
i = ord(i)
if 97 <= i <= 117 or 65 <= i <= 85:
i = i + 5
elif 117 < i <= 122 or 85 < i <= 90:
i = i - 21
else:
i = i
list.append(chr(i))
return ''.join(list)
def decoder(n):
n=encoder(n)
list=[]
for i in n:
i=ord(i)
if 102 <= i <= 122 or 70 <= i <= 90:
i=i-5
elif 97 <= i < 102 or 65 <= i < 70:
i=i+21
else:
i=i
list.append(chr(i))
return ''.join(list)
n = input('输入英文文本：')
print('编码后' + encoder(n))
print('编码后' + decoder(n))
def collatz(n):
if n%2==0:
return n/2
else:
return 3*n+1
try:
a=eval(input('Enter a positive integer:'))
if int(a)!=a or a<=0:
raise ValueError and NameError
except ValueError and NameError:
print('Error: must be a positive integer')
else:
list=[a]
while a!=1:
a=collatz(a)
list.append(a)
print(list)
