#acl AdminGroup:read,write,delete,revert  EditorGroup:read,write StudentGroup:read,write All:read
#format wiki
#language de
#pragma section-numbers off


= For loops =

== a) ==

{{{#!python
for i in range(0,4,1):
     print i
  
0
1 
2
3
}}}

 * Insert an expression in {{{...}}} to get the results.

Solution:

== b) ==
{{{
0 0
0 1
0 2
0 3
1 0
1 1
1 2
1 3
2 0
2 1
2 2
2 3
3 0
3 1
3 2
3 3
}}}

 * What are the corresponding loops?

Solution (two in one ;-):
{{{#!python 
a = [range(0,4)]
for item in a:
         b = item * 4
         b.sort()
         c = item * 4
         d = [b,c]
         print d
}}}

= Data types =

{{{
A=dict([('a',1),('b',2)])
}}}

Please specify the data types:

 
 * A is a ...
 * 'a' is a ...
 * 1 is a ...
 * ('a',1) is a ...
 * [('a',1),('b',2)] is a ...

Provide an alternative way to assign A
 

= Scipy numeric types =

{{{from scipy import *}}}

One byte consists of eight bit and covers the value range of 0..255 ({{{uint8}}}, unsigned integer) 
or -128..127.

{{{#!python
b=int8(128)
-128 # Invalid range

b.nbytes
1
}}}

== a) ==

What is the value range of the following types and how many bytes are allocated in the memory?

 * bool8
 * uint8, int8
 * uint16, int16
 * uint32, int32
 * uint64, uint64

Solution:


== b) ==

How many bytes are allocated in the memory by these  [[http://en.wikipedia.org/wiki/Floating_point|floating point]] types?

 * float32, float64, float96
 * complex64, complex128, complex192

Solution:

= Data structures =
== a) ==
{{{#!python
D={'A':array(range(10)),'B':array(range(10))+1}
}}}

 * Which keys contains the dictionary {{{D}}}
 * Get the keys with the method {{{D.keys()}}}
 * Display all values of {{{D}}} using the method {{{.values()}}}
 * Display array {{{A}}}
 * Display the elements {{{3:6}}} of arrays {{{B}}} 
 * Set this elements to 0
 * Insert a new key-values pair {{{C:array(range(0,10,-1))}}} into {{{D}}} 

Solution:


= Reading and practicing =

Install python and ipython on your computer and read through the tutorial which comes with the documentation. There are translations in other languages:
 
 * [[http://wiki.python.org/moin/Languages/German?highlight=(CategoryLanguage)|German Language]]
 * [[http://starship.python.net/crew/gherman/publications/tut-de/online/tut/|Das Python-Tutorium (Version 1.5.2)]]
 * [[http://www.heise.de/ix/artikel/1999/11/184/|Beschränkung aufs Wesentliche (iX 11/1999)]]