sbs5@ladybug:~/cs200/www/lectures$ date
Mon Sep  9 02:26:36 PM EDT 2024
sbs5@ladybug:~/cs200/www/lectures$ pwd
/home/accts/sbs5/cs200/www/lectures
sbs5@ladybug:~/cs200/www/lectures$ p
Python 3.10.12 (main, Jul 29 2024, 16:56:48) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 1 1 = 2
  File "<stdin>", line 1
    1 1 = 2
      ^
SyntaxError: invalid syntax
>>> 1 == 2
False
>>> help(len)
Help on built-in function len in module builtins:

len(obj, /)
    Return the number of items in a container.

>>> len('hello')
5
>>> len([1,2,3,4,5]
... )
5
>>> help(help)
Help on _Helper in module _sitebuiltins object:

class _Helper(builtins.object)
 |  Define the builtin 'help'.
 |  
 |  This is a wrapper around pydoc.help that provides a helpful message
 |  when 'help' is typed at the Python interactive prompt.
 |  
 |  Calling help() at the Python prompt starts an interactive help session.
 |  Calling help(thing) prints help for the python object 'thing'.
 |  
 |  Methods defined here:
 |  
 |  __call__(self, *args, **kwds)
 |      Call self as a function.
 |  
 |  __repr__(self)
 |      Return repr(self).
 |  
 |  ----------------------------------------------------------------------
 |  Data descriptors defined here:
 |  
 |  __dict__
 |      dictionary for instance variables (if defined)
 |  
 |  __weakref__
 |      list of weak references to the object (if defined)

>>> dir(sys)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'sys' is not defined
>>> import sys
>>> dir(sys)
['__breakpointhook__', '__displayhook__', '__doc__', '__excepthook__', '__interactivehook__', '__loader__', '__name__', '__package__', '__spec__', '__stderr__', '__stdin__', '__stdout__', '__unraisablehook__', '_base_executable', '_clear_type_cache', '_current_exceptions', '_current_frames', '_deactivate_opcache', '_debugmallocstats', '_framework', '_getframe', '_git', '_home', '_xoptions', 'abiflags', 'addaudithook', 'api_version', 'argv', 'audit', 'base_exec_prefix', 'base_prefix', 'breakpointhook', 'builtin_module_names', 'byteorder', 'call_tracing', 'copyright', 'displayhook', 'dont_write_bytecode', 'exc_info', 'excepthook', 'exec_prefix', 'executable', 'exit', 'flags', 'float_info', 'float_repr_style', 'get_asyncgen_hooks', 'get_coroutine_origin_tracking_depth', 'get_int_max_str_digits', 'getallocatedblocks', 'getdefaultencoding', 'getdlopenflags', 'getfilesystemencodeerrors', 'getfilesystemencoding', 'getprofile', 'getrecursionlimit', 'getrefcount', 'getsizeof', 'getswitchinterval', 'gettrace', 'hash_info', 'hexversion', 'implementation', 'int_info', 'intern', 'is_finalizing', 'last_traceback', 'last_type', 'last_value', 'maxsize', 'maxunicode', 'meta_path', 'modules', 'orig_argv', 'path', 'path_hooks', 'path_importer_cache', 'platform', 'platlibdir', 'prefix', 'ps1', 'ps2', 'pycache_prefix', 'set_asyncgen_hooks', 'set_coroutine_origin_tracking_depth', 'set_int_max_str_digits', 'setdlopenflags', 'setprofile', 'setrecursionlimit', 'setswitchinterval', 'settrace', 'stderr', 'stdin', 'stdlib_module_names', 'stdout', 'thread_info', 'unraisablehook', 'version', 'version_info', 'warnoptions']
>>> dir(dir)
['__call__', '__class__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__name__', '__ne__', '__new__', '__qualname__', '__reduce__', '__reduce_ex__', '__repr__', '__self__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__text_signature__']
>>> str(123)
'123'
>>> str(3 + 7)
'10'
>>> s = 'hello'
>>> s
'hello'
>>> s.capitalize()
'Hello'
>>> s
'hello'
>>> s.uppercase()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'uppercase'
>>> s.upper()
'HELLO'
>>> s.upper().lower()
'hello'
>>> s
'hello'
>>> s.isalpha()
True
>>> '123'.isalpha()
False
>>> '123'.isnumeric()
True
>>> '123'.isdigit()
True
>>> '123'.isalnum()
True
>>> s
'hello'
>>> s.islower()
True
>>> s.isupper()
False
>>> s = '   hello world   '
>>> s
'   hello world   '
>>> len(s)
17
>>> s.strip()
'hello world'
>>> len(s.strip())
11
>>> s.upper()
'   HELLO WORLD   '
>>> s.capitalize()
'   hello world   '
>>> s.strip().capitalize()
'Hello world'
>>> s.strip().startswith('h')
True
>>> s.startswith('h')
False
>>> s.find(' ')
0
>>> s
'   hello world   '
>>> s[0]
' '
>>> s
'   hello world   '
>>> s[3]
'h'
>>> s[4]
'e'
>>> s = s.strip()
>>> s
'hello world'
>>> s[-1]
'd'
>>> s[-2]
'l'
>>> s[-3]
'r'
>>> len(s)
11
>>> s[11]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: string index out of range
>>> s[10]
'd'
>>> s[-11]
'h'
>>> s[-12]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: string index out of range
>>> s
'hello world'
>>> s[0:4]
'hell'
>>> s[0:5]
'hello'
>>> s[:5]
'hello'
>>> s[7:]
'orld'
>>> s[6:]
'world'
>>> s[:]
'hello world'
>>> s[::2]
'hlowrd'
>>> s[::-1]
'dlrow olleh'
>>> s == s[::-1]
False
>>> r = 'radar'
>>> r == r[::-1]
True
>>> r
'radar'
>>> id(r)
139608444830704
>>> id(s)
139608443644592
>>> x = s
>>> x
'hello world'
>>> id(x)
139608443644592
>>> x = s[:]
>>> x
'hello world'
>>> id(x)
139608443644592
>>> id(s)
139608443644592
>>> s == x
True
>>> s is x
True
>>> s = s + 'x'
>>> s
'hello worldx'
>>> s == x
False
>>> s is x
False
>>> id(x)
139608443644592
>>> id(s)
139608444709488
>>> s = 'a string'
>>> s.replace(' ', '*')
'a*string'
>>> s
'a string'
>>> s.split()
['a', 'string']
>>> a = 'every good boy does fine'
>>> s.split()
['a', 'string']
>>> a.split()
['every', 'good', 'boy', 'does', 'fine']
>>> a.replace(' ','/')
'every/good/boy/does/fine'
>>> aa = a.replace(' ','/')
>>> aa
'every/good/boy/does/fine'
>>> aa.split()
['every/good/boy/does/fine']
>>> aa.split('/')
['every', 'good', 'boy', 'does', 'fine']
>>> '***'.join(aa.split('/'))
'every***good***boy***does***fine'
>>> ' '.join(aa.split('/'))
'every good boy does fine'
>>> ord('a')
97
>>> ord('A')
65
>>> ord('B')
66
>>> char(97)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'char' is not defined. Did you mean: 'chr'?
>>> chr(97)
'a'
>>> chr(ord('7')
... )
'7'
>>> l = [1,2,3,4,5]
>>> len(l)
5
>>> l[0]
1
>>> l[4]
5
>>> l[-1]
5
>>> l[:3]
[1, 2, 3]
>>> l[3:]
[4, 5]
>>> l[::-1]
[5, 4, 3, 2, 1]
>>> l[5]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range
>>> l[-6]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range
>>> for element in l:
    print (element*2, end='')
    print (' x')
print ('y')
... ... ...   File "<stdin>", line 4
    print ('y')
    ^^^^^
SyntaxError: invalid syntax
>>> for x in l:
...   print (x * 2, x)
... 
2 1
4 2
6 3
8 4
10 5
>>> l
[1, 2, 3, 4, 5]
>>> sum = 0
>>> for x in l:
...   sum = sum + x
... 
>>> sum
15
>>> for x in l:
...   sum += x
... 
>>> sum
30
>>> 3 in l
True
>>> l
[1, 2, 3, 4, 5]
>>> 6 in l
False
>>> 6 not in l
True
>>> 
sbs5@ladybug:~/cs200/www/lectures$ exit

Process shell finished