• Python
• Exercise2

For loops

a)

   1 for ...:
   2      print i
   3   
   4 0
   5 1 
   6 2
   7 3

• Insert an expression in ... to get the results.

Solution

b)

   1 for ... in zip(range(0,4,1),range(4,0,-1)):
   2      print i,j
   3   
   4 0 4
   5 1 3
   6 2 2
   7 3 1

• Insert an expression in ... to get the results.

Solution

c)

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

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.

   1 b=int8(128)
   2 -128 # Invalid range
   3 
   4 b.nbytes
   5 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 floating point types?

• float32, float64, float96
• complex64, complex128, complex192

Solution

Data structures

a)

Solution

b)

   1 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 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

• Display all values of D using the method .values()

Solution