sbs5@hornet:~/cs200/www/lectures$ date
Mon Nov  4 02:29:56 PM EST 2024
sbs5@hornet:~/cs200/www/lectures$ pwd
/home/accts/sbs5/cs200/www/lectures
sbs5@hornet:~/cs200/www/lectures$ p
Python 3.10.12 (main, Sep 11 2024, 15:47:36) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import this
The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!
>>> from exceptions import *
>>> f1()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 5, in f1
    return 1/0
ZeroDivisionError: division by zero
>>> f2()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 9, in f2
    return a
NameError: name 'a' is not defined
>>> f3()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 14, in f3
    return a[2]
IndexError: list index out of range
>>> f4()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 18, in f4
    return foo()
NameError: name 'foo' is not defined
>>> f5()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 22, in f5
    for x in open("foo"):
FileNotFoundError: [Errno 2] No such file or directory: 'foo'
>>> f6()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 27, in f6
    import foo
ModuleNotFoundError: No module named 'foo'
>>> f7()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 32, in f7
    return d['key']
KeyError: 'key'
>>> f8()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 37, in f8
    os.mkdir("/hello")
PermissionError: [Errno 13] Permission denied: '/hello'
>>> f9()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 43, in f9
    f9()
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 43, in f9
    f9()
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 43, in f9
    f9()
  [Previous line repeated 996 more times]
RecursionError: maximum recursion depth exceeded
>>> sys.getrecursionlimit()
1000
>>> f10()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 48, in f10
    g.next()
AttributeError: 'range' object has no attribute 'next'
>>> f = 9
>>> f.dkdkdk
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'int' object has no attribute 'dkdkdk'
>>> f.property
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'int' object has no attribute 'property'
>>> f11()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 53, in f11
    next(g)
TypeError: 'range' object is not an iterator
>>> x
0
>>> f13()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 64, in f13
    x += 1
UnboundLocalError: local variable 'x' referenced before assignment
>>> f14()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 76, in f14
    raise MyError("oops!")
exceptions.MyError: 'oops!'
>>> f14a()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 80, in f14a
    raise Exception("oops!")
Exception: oops!
>>> f15()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 84, in f15
    raise TypeError("this is a mistake")
TypeError: this is a mistake
>>> f16()
You raised an exception
>>> f17(1/2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: f17() missing 1 required positional argument: 'y'
>>> f17(1,2)
result is 0.5
executing finally clause
>>> f17(1,0)
division by zero!
executing finally clause
>>> f17('1','2')
executing finally clause
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 95, in f17
    result = x / y
TypeError: unsupported operand type(s) for /: 'str' and 'str'
>>> 
sbs5@hornet:~/cs200/www/lectures$ p
Python 3.10.12 (main, Sep 11 2024, 15:47:36) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from exceptions import *
>>> f17(1,2)
result is 0.5
executing finally clause
>>> f17('1', '2')
Oops! wrong type!
executing finally clause
>>> f17b(''cnn.com')
  File "<stdin>", line 1
    f17b(''cnn.com')
                  ^
SyntaxError: unterminated string literal (detected at line 1)
>>> f17b('cnn.com')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 113, in f17b
    ufile = urllib.request.urlopen(url)
  File "/usr/lib/python3.10/urllib/request.py", line 216, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.10/urllib/request.py", line 503, in open
    req = Request(fullurl, data)
  File "/usr/lib/python3.10/urllib/request.py", line 322, in __init__
    self.full_url = url
  File "/usr/lib/python3.10/urllib/request.py", line 348, in full_url
    self._parse()
  File "/usr/lib/python3.10/urllib/request.py", line 377, in _parse
    raise ValueError("unknown url type: %r" % self.full_url)
ValueError: unknown url type: 'cnn.com'
>>> f17b('https://cnn.com')
3626953
>>> f17b('https://cnn.com.xxx')
'problem reading url:https://cnn.com.xxx'
>>> f18()
Error: <class 'ZeroDivisionError'>
(<class 'ZeroDivisionError'>, ZeroDivisionError('division by zero'), <traceback object at 0x74bacf97e0c0>)
>>> f20(0)
>>> f20(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/httpd/html/zoo/classes/cs200/lectures/exceptions.py", line 138, in f20
    assert(x % 2 == 0)
AssertionError
>>> f21()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: f21() missing 1 required positional argument: 'filename'
>>> f21('filename')
[Errno 2] No such file or directory: 'filename'
File not found
FileNotFoundError(2, 'No such file or directory')
>>> 
sbs5@hornet:~/cs200/www/lectures$ exit

Process shell finished