Administrators-Computer:~ loewis$ python
Python 2.3.5 (#1, Mar 20 2005, 20:38:20) 
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class Person:
...   def __init__(self, vorname, name, alter):
...     self.vorname = vorname
...     self.name = name
...     self.alter = alter
...     print "Datensatz erzeugt"
... 
>>> Person
<class __main__.Person at 0x69e10>
>>> p = Person("Erika", "Mustermann", 42)
Datensatz erzeugt
>>> p 
<__main__.Person instance at 0x741c0>
>>> p.vorname
'Erika'
>>> p.nachname
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
AttributeError: Person instance has no attribute 'nachname'
>>> p.name
'Mustermann'
>>> p.alter
42
>>> p.alter = p.alter+1
>>> p.alter
43
>>> from math import sin
>>> sin(2)
0.90929742682568171
>>> sin(2) = 34
SyntaxError: can't assign to function call
>>> d = { "Brandenburg":"Potsdam", "Meckpom":"Schwerin"}
>>> d["Meckpom"]
'Schwerin'
>>> d["Brandenburg"]="Berlin"
>>> d
{'Brandenburg': 'Berlin', 'Meckpom': 'Schwerin'}
>>> d["Bayern"] = "Muenchen"
>>> d
{'Bayern': 'Muenchen', 'Brandenburg': 'Berlin', 'Meckpom': 'Schwerin'}
>>> "NRW" in d
False
>>> "Bayern" in d
True
>>> len(d)
3
>>> d.keys()
['Bayern', 'Brandenburg', 'Meckpom']
>>> d.values()
['Muenchen', 'Berlin', 'Schwerin']
>>> d.items()   
[('Bayern', 'Muenchen'), ('Brandenburg', 'Berlin'), ('Meckpom', 'Schwerin')]
>>> type(d.items())
<type 'list'>
>>> x = [3,6,7,9]
>>> x[0]
3
>>> x[-1]
9
>>> x[-4]
3
>>> x[-5]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
IndexError: list index out of range
>>> d["NRW"]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
KeyError: 'NRW'
>>> from sets import Set
>>> Set((1,2,3))
Set([1, 2, 3])
>>> s = Set((1,2,3))
>>> s.add(127)
>>> s
Set([1, 2, 3, 127])
>>> 3 in s
True
>>> -3 in s
False
>>> s2 = Set((47,26,3))
>>> s.intersection(s2)
Set([3])
>>> s.union(s2)
Set([1, 2, 3, 26, 47, 127])
>>> s2-s
Set([26, 47])
>>> "Hello\n"
'Hello\n'
>>> len("Hello\n")
6
>>> len("\n")
1
>>> ord("\n")
10
>>> 

Administrators-Computer:~ loewis$ cat /etc/passwd 
##
# User Database
[snip]
nobody:*:-2:-2:Unprivileged User:/:/usr/bin/false
root:*:0:0:System Administrator:/var/root:/bin/sh
daemon:*:1:1:System Services:/var/root:/usr/bin/false
[snip]
Administrators-Computer:~ loewis$ python
Python 2.3.5 (#1, Mar 20 2005, 20:38:20) 
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> f = open("/etc/passwd", "r")
>>> f
<open file '/etc/passwd', mode 'r' at 0x64ba0>
>>> f.read(5)
'##\n# '
>>> f.read(50)
'User Database\n# \n# Note that this file is consulte'
>>> f.read(80)
'd when the system is running in single-user\n# mode.  At other times this informa'
[snip]
'in/false\nsecurityagent:*:92:92:SecurityAgent:/var/empty:/usr/bin/false\nunknown:*'
>>> f.read(80)
':99:99:Unknown User:/var/empty:/usr/bin/false\n'
>>> f.read(80)
''
>>> 
Administrators-Computer:~ loewis$ python
Python 2.3.5 (#1, Mar 20 2005, 20:38:20) 
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> open("/etc/passwd","w")
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
IOError: [Errno 13] Permission denied: '/etc/passwd'
>>> f=open("/tmp/passwd","w")
>>> f.write("Zeile 1\n")
>>> f.write("Zeile 2\n")
>>> f.close()
>>> 
Administrators-Computer:~ loewis$ cat /tmp/passwd 
Zeile 1
Zeile 2
Administrators-Computer:~ loewis$ python
Python 2.3.5 (#1, Mar 20 2005, 20:38:20) 
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.stdout
<open file '<stdout>', mode 'w' at 0x2a060>
>>> sys.stdout.write("Zeile 3\n") 
Zeile 3
>>> open("/etc/passwd")
<open file '/etc/passwd', mode 'r' at 0x644a0>
>>> f=_
>>> f.close()
>>> 3+4*5
23
>>> x=_
>>> x
23
>>> f = open("/etc/passwd")
>>> f.readline()
'##\n'
>>> f.readline()
'# User Database\n'
>>> f.readline()
'# \n'
>>> f.readline()
'# Note that this file is consulted when the system is running in single-user\n'
>>> lines = f.readlines()
>>> lines
['# mode.  At other times this information is handled by one or more of:\n', '# lookupd DirectoryServices  \n', '# By default, lookupd gets information from NetInfo, so this file will \n', "# not be consulted unless you have changed lookupd's configuration.\n", [snip] 'unknown:*:99:99:Unknown User:/var/empty:/usr/bin/false\n']
>>> lines = None
>>> print lines
None
>>> lines == None 
True
>>> 
>>> def add(a,b):
...   return a+b
... 
>>> add(3,4)
7
>>> s = add(3,4) 
>>> s
7
>>> addiere = add
>>> addiere(10,2)
12
>>> import math
>>> d = [math.sin, math.cos]
>>> d
[<built-in function sin>, <built-in function cos>]
>>> d[0]
<built-in function sin>
>>> d[0](2)
0.90929742682568171
>>> def mkinc(n):
...   def inc(x):
...     return x+n
...   return inc
... 
>>> mkinc(1)
<function inc at 0x644b0>
>>> f=mkinc(1)
>>> f(19)
20
>>> f(100)
101
>>> f = mkinc(-1)
>>> f(19)
18
>>> mkinc(8)(9)
17
>>>