python循环嵌套的多种使用方法解析

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 
num=[];
i=2
for i in range(2,100):
  j=2
  for j in range(2,i):
   if(i%j==0):
     break
  else:
   num.append(i)
print(num)

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 
#*字塔
i=1
#j=1
while i<=9:
  if i<=5:
   print ("*"*i)
 
  elif i<=9 :
   j=i-2*(i-5)
   print("*"*j)
  i+=1
else :
  print("")

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 
array = [9,2,7,4,5,6,3,8,1,10]
L = len(array)
for i in range(L):
  for j in range(L-i):
    if array[L-j-1]<array[L-j-2]:
      array[L-j-1],array[L-j-2]=array[L-j-2],array[L-j-1]
for i in range(L):
  print array[i],

array = [8,2,6,3,4,5,7,1,10,9]
L=len(array)
for i in range(1,L):
  temp = array[i]
  array.remove(array[i])
  for j in range(i):
    if array[j]>temp:
      array.insert(j,temp)
      break
  else:
    array.insert(i,temp)
print(array)