Reading-Notes

Code Fellows Python 401

Read: 06 - Ten Thousand Game 1

How to use Random Module

will allow you to produce random numbers

Randint

accepts two parameters: generates an integer between 2 number.
```
import random
print random.randint(0, 5)
```
output either 1, 2, 3, 4 or 5

Random

a random number between 0 and 1: can be multiplyed to produce larger numbers.
```
import random
random.random() * 100
```
output will be between 0 and 100

Choice

Generate a random value from the sequence sequence. ``` python import random random.choice( [‘red’, ‘black’, ‘green’] )

myList = [2, 109, False, 10, “Lorem”, 482, “Ipsum”] random.choice(myList)

### Shuffle
- shuffles the elements in a list in place
``` python
from random import shuffle
x = [[i] for i in range(10)]
shuffle(x)

output: print x gives [[9], [2], [7], [0], [4], [5], [3], [1], [8], [6]] results will vary

Randrange

Generate a randomly selected element from range(start, stop, step)

random.randrange(start, stop[, step])
import random
for i in range(3):
  print random.randrange(0, 101, 5)

Code Example

import random
import itertools

outcomes = { 'heads':0,
             'tails':0,
             }
sides = outcomes.keys()

for i in range(10000):
    outcomes[ random.choice(sides) ] += 1

print 'Heads:', outcomes['heads']
print 'Tails:', outcomes['tails']

What is Risk Analysis

In Software Testing, risk analysis is the process of identifying the risks in applications or software that you built and prioritizing them to test.

Why

highlights potential problems
mitigate risk by practicing problem prevention:
- Conduct Risk Assessment review meeting
- Use maximum resources to work on high-risk areas
- Create a Risk Assessment database for future use
- Identify and notice the risk magnitude indicators: high, medium, low.
unavoidable risks:
1. The time that you allocated for testing
2. A defect leakage due to the complexity or size of the application
3. Urgency from the clients to deliver the project
4. Incomplete requirements
levels of risk:
- High: non-tolerable. The company might face loss.
- Medium: not desirable. The company may suffer financially but there is a limited risk.
- Low: tolerable. little or no external exposure or no financial loss.

Risk Identifications:

Business Risks: This risk is the most common risk associated with our topic. It is the risk that may come from your company or your customer, not from your project.
Testing Risks: You should be well acquainted with the platform you are working on, along with the software testing tools being used.
Premature Release Risk: a fair amount of knowledge to analyze the risk associated with releasing unsatisfactory or untested software is required
Software Risks: You should be well versed with the risks associated with the software development process.

Risk Assessment

Risk Assessment Visual

perspective of Risk Assessment

Effect – To assess risk by Effect. In case you identify a condition, event or action and try to determine its impact.
Cause – To assess risk by Cause is opposite of by Effect. Initialize scanning the problem and reach to the point that could be the most probable reason behind that.
Likelihood – To assess risk by Likelihood is to say that there is a probability that a requirement won’t be satisfied.

How to perform Risk Analysis

Searching the risk
Analyzing the impact of each individual risk
Measures for the risk identified

Test Coverage

also called code coverage

finds untested parts of a codebase
use things like TDD

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