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1.

print(a+b)

2.

print(a[::-1])

3.

L.sort()
print(L)

4.

c=list(a.keys())
c.sort()
print(','.join(str(i)for i in c))

5.

c=""
for i in range(0,len(a),2):
    c+=a[i]
print(c)

6.

vis = [1]*101
vis[0]=vis[1]=0
primes = list()
ans = []
def getprime():
    for i in range(2,101):
        if vis[i]:
            ans.append(str(i))
            primes.append(i)
        for j in primes:
            if i*j>100:
                break
            vis[i*j]=0
            if i%j==0:
                break
            

    print(" ".join(ans))

getprime()

欧拉法线性筛选法

7.

print(a*b,2*(a+b),sep=' ')

8.

L.sort()
if(len(L)-1)%2==0:
    print(L[int(len(L)/2)])
else:
    print(L[(len(L)-1)//2]+L[len(L)/2])/2.0

9.

def gcd(a,b):
    return a if(b==0)else gcd(b,a%b)

print(gcd(n,m))

10.

def gcd(a,b):
    return a if(b==0)else gcd(b,a%b)

print(a*b//gcd(a,b))

11.

sum=0
a=1
for i in range(len(L)):
    a*=L[i]
    while(a>=10):
        if(a==10):
            sum+=1
            a=1
        elif(a%10==0):
            sum+=1
            a/=10
        else:
            a=a%10
print(sum)
        

12.

a=1
for i in range(len(L)):
    a*=L[i]
    while(a>=10):
        if(a==10):
            a=1
        elif(a%10==0):
            a/=10
        else:
            a=a%10
ans = 0 if(a%2==0) else 1
print (ans)

13.

sum=0
while(a):
    if(a&1):
        sum+=1
    a=a>>1
print(sum)

14.

import this as ruozhiti
print(ruozhiti.s)

15.

print(a.lower())

16.

def gcd(a,b):
    return a if(b==0)else gcd(b,a%b)
def gg(a,b):
    cnt=0
    for i in range(1,gcd(a,b)+1):
        if(a%i==0 and b%i==0):
            cnt+=1
    return cnt
print(gg(a,b))

17.

import math
def gg(a,b):
    d=a*b
    i=int(math.sqrt(d))+1
    for g in range(i,0,-1):
        if(d%g==0):
            c = g
            m=int(d/g)
            break
    print(c,m)
gg(a,b)

18.

a="OurWorldIsFullOfLOeE"
a=a.upper()
c="LOVE"
d="SINGLE"
print(c)if (c in a) else print (d)

19.