strip(rm)用来删除元素内的空白符：
rm对应要删除空白符的元素，当rm为空(strip())时删除所有元素的空白符
startswith、endswith用来查找开头或结尾条件的元素
例子：
1 li = ["alec", " aric", "Alex", "Tony", "rain"]
2 tu = ("alec", " aric", "Alex", "Tony", "rain")
3 dic = {'k1': "alex", 'k2': ' aric', "k3": "Alex", "k4": "Tony"}
4 for i in li:
5 b = i.strip()
6 if (b.startswith("a") or b.startswith("A")) and b.endswith("c"):
7 print(b)
8
9 for i in tu:
10 b = i.strip()
11 if (b.startswith("a") or b.startswith("A")) and b.endswith("c"):
12 print(b)
13
14 for i in dic:
15 b = dic[i].strip()
16 if (b.startswith("a") or b.startswith("A")) and b.endswith("c"):
17 print(b)
上面代码：查找以 a或A开头并且以 c 结尾的所有元素，并输出
输出结果：
alec aric alec aric aric
