分享几个小程序

 1 import time
 2 scale = 50
 3 print("执行开始".center(scale//2,‘-‘))
 4 start = time.perf_counter()
 5 for i in range(scale+1):
 6     a = ‘*‘ * i
 7     b = ‘.‘ * (scale - i)
 8     c = (i/scale)*100
 9     dur = time.perf_counter() - start
10     print("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c,a,b,dur),end=‘‘)
11     time.sleep(0.1)
12 print("\n"+"执行结束".center(scale//2,‘-‘))

 1 s=0
 2 i=2
 3 while i<100:
 4     for t in range(2,i):
 5         if i%t==0:
 6             break
 7     else:
 8         s+=i
 9     i+=1
10 print(s)

 1 def is_prime(n):
 2     if n<=1:
 3         return False
 4     for i in range(2,n):
 5         if n%i==0:
 6             return False
 7     return True
 8 
 9 sum=0
10 for i in range(100):
11     if is_prime(i):
12         sum+=i
13 print(sum)