Python for循环基础

# n=10
# for i in range(n):
#         print("hello world")
# ~~~~~~~~~~~~~~~~
# for i in range(100):
#  if(i>50):
#    if(i%2==0):
#          print(i)
#    ~**************
# 
# for i in range(100,50,-1):
#        if(i%3==0 and i>50):
#                  print(i)

#   双for循环
flag=0
for i in range(10):
   print(f"当前第{i}层".center(20,'~'))
   if(flag==1):
    break
   for j in range(7):
                print("%d0%d室"%(i,j))
                if(j==5 and i==4):
                 flag=1
                 break
#    if(flag==1):
#     break