课时32：异常处理：你不可能总是对的

file_name = input("请输入要打开的文件名：")
f = open(file_name,'r')
print("文件的内容是：")

for each_line in f:
      print(each_line)

请输入要打开的文件名：我为什么是一个文档.txt
Traceback (most recent call last):
  File "C:\Users\14158\Desktop\lalallalalal.py", line 2, in <module>
    f = open(file_name,'r')
FileNotFoundError: [Errno 2] No such file or directory: '我为什么是一个文档.txt'

>>> my_list = ["小甲鱼"]
>>> assert len(my_list) > 0
>>> my_list.pop()
'小甲鱼'
>>> assert len(my_list) > 0
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    assert len(my_list) > 0
AssertionError

>>> my_list = []
>>> my_list.fishc
Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    my_list.fishc
AttributeError: 'list' object has no attribute 'fishc'

>>> my_list = [1,2,3]
>>> my_list[3]
Traceback (most recent call last):
  File "<pyshell#7>", line 1, in <module>
    my_list[3]
IndexError: list index out of range

>>> my_dict = {"one":1,"two":2,"three":3}
>>> my_dict["one"]
1
>>> my_dict["four"]
Traceback (most recent call last):
  File "<pyshell#12>", line 1, in <module>
    my_dict["four"]
KeyError: 'four'

>>> fishc
Traceback (most recent call last):
  File "<pyshell#13>", line 1, in <module>
    fishc
NameError: name 'fishc' is not defined

>>> print "I love fishc.com"
SyntaxError: Missing parentheses in call to 'print'. Did you mean print("I love fishc.com")?

>>> 1 + "1"
Traceback (most recent call last):
  File "<pyshell#14>", line 1, in <module>
    1 + "1"
TypeError: unsupported operand type(s) for +: 'int' and 'str'

>>> 5/0
Traceback (most recent call last):
  File "<pyshell#15>", line 1, in <module>
    5/0
ZeroDivisionError: division by zero