python的一些小程序

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第一个程序：输出三角形
#!/usr/bin/env python
for i in range(0,6):
   for j in range (0,6-i-1):
       print " ",
   for k in range(2*(i-1)+1):
       print "*",
   print "\n"

pycharm怎么修改变量名：shift+f6

三元表达式：print 1 if l is None else 0

列表解析/列表推导：

       l = [_ for _ in l if _ == 'a']        #[]也可是（）
       再某个列表的每一项的基础上过滤生成一个新的列表

第二次练习：
1.给定一个100个内容的list，使用切片实现一个翻页功能，每页15条数据

1 #!/usr/bin/env python
2 l = range(1,101)
3 page = input("input page:")
4 start = (page-1)*15
5 end = start + 15
6 print l[start:end]

2.给定一个list，去除重复的数据，并保持list的顺序基本不变

1 #!/usr/bin/env python
2 list1 = [1,3,4,3,2,2]
3 for i in range(len(list1)):
4     for j in range(i+1,len(list1)):
5         if list1[i] == list1[j]:
6             del list1[j]
7             break
8 print list1

3.给定两个list，通过列表解析获取其中相同的数据，并生成一个新的list

1 #!/usr/bin/env python
2 list1 = [1,3,4,6]
3 list2 = [1,5,3,4]
4 l = [ll for ll in list1 for lll in list2 if ll == lll]
5 print l

4.给定一个数字（4位以内），用*将数字的形状打印出来：比如：8
****
* *
****
* *
****

1 #!/usr/bin/env python
2 n = raw_input("input a number which is less 10000:")
3 list1 = list(n)
4 l=[["******"," * ","******","******","* * ","******","******","******"," *    **** ","******"],["*    *"," * ","     *","     *","* * ","*     ","*         ","     *","*     *","*    *"],["*    *"," * ","******","******","******","*    *****","******","    * "," ***** ","******"],["*    *"," * ","*     ","         *","   * ","     *","*    *","     *","*     *","     *"],["******"," * ","    ******","******","   * ","******","******","     *"," ***** ","******"]]
5
6 for i in range(5):
7     for j in list1:
8         j = int(j)
9         print l[i][j],
10
11     print "\n"
~

5.给定一个整数list，通过列表解析构建一个包含其偶数项的新list

1 #!/usr/bin/env python
2 list1 = [1,5,3,2,5]
3 print [ll for ll in list1 if ll%2==0]

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