添加了面试相关资料

面试指南.md

+## 面试指南
+
+### 基础知识
+
+1. 下面的代码会输出什么。
+
+   ```Python
+   
+   list1 = [1, 2, 3, 4]
+   
+   list2 = [i for i in list1 if i > 2]
+   print(list2)
+   
+   list3 = [i for i in list1 if i % 2]
+   print(list3)
+   
+   dict1 = {x: x ** 2 for x in (2, 4, 6)}
+   print(dict1)
+   
+   dict2 = {x: f'item{x ** 2}' for x in (2, 4, 6)}
+   print(dict2)
+   
+   set1 = {x for x in 'hello world' if x not in 'abcdefg'}
+   print(len(set1))
+   ```
+
+2. 下面的代码会输出什么。
+
+    ```Python
+   
+   num = 100
+   
+   
+   def foo():
+   	num = 200
+   
+   
+   def bar():
+   	print(num)
+   
+   
+   bar()
+   foo()
+   bar()
+    ```
+
+3. 如何修改下面的Python代码，才能够输出“foo in father”？
+
+   ```Python
+   
+   class Father(object):
+   	
+   	def foo(self):
+   		print('foo in father.')
+   
+   
+   class Son(object):
+   	
+   	def foo(self):
+   		print('foo in son.')
+   
+   
+   obj = Son()
+   obj.foo()
+   ```
+
+4. 
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