import random
DNA=['A','G','T','C']
s=''
for i in range(20):
①
print(s)
match={'A':'T','T':'A','G':'C','C':'G'}
t=''
for i in range(20):
②
print('互补链:',t)
import math
def IsPrime(i):
if i==1:
return False
for j in range(2,int(math.sqrt(i))+1):
if:
return False
return True
a=int(input("请输入a:"))
b=int(input("请输入b:"))
summ=0
for i in range(a,b+1):
if IsPrime(i):
while t>0:
summ=summ+t%10
print("数字和为:",summ)
根据分数判断其所属等级的标准如下:
分数段 | 90~100 | 80~89 | 70~79 | 60~69 | 60以下 |
等级 | A | B | C | D | E |
实现该功能的程序段如下,请完善程序:
def check(a):
if
level[0]+=1
elif int(a)>=80:
level[1]+=1
elif int(a)>=70:
level[2]+=1
elif int(a)>=60:
level[3]+=1
else:
f=open("score.txt","r")
score=f.readline( )
level=[0]*5
while score:
score=f.readline()
f.close()
for i in range(0,5):
print("等级"++"的人数为:",level[i])