Difference between revisions of "Statistical Algorithms Importer: Python Project FAQ"

Latest revision as of 11:47, 12 February 2021

F.A.Q. of Statistical Algorithms Importer (SAI), here are common mistakes we have found in Python Project.

How to use the enumerated parameters

For example we consider this parameter:

Enumerated Param, SAI

As you can see, it is a Enumerated parameter and it is specified using a pipe-separated list of strings. The parameter will be transformed into a controlled vocabulary and will be displayed via a drop-down list in DataMiner.

Enumerated Param in DataMiner, SAI

How to use the input and output file parameters

For example we consider Phonebook algorithm:

Phonebook, SAI

Phonebook, SAI

Phonebook, SAI

DataMiner show the Phonebook algorithm in this way:

Phonebook in DataMiner interface, SAI

Python script code in sample:

#
# author Giancarlo Panichi
#
# Phonebook
# 
import sys
import string
 
def print_numbers(numbers):
    print "Telephone Numbers:"
    for x in numbers.keys():
        value="Name: "+x+" Number: "+numbers[x]
        print value,
 
def lookup_number(numbers,name):
    if numbers.has_key(name):
        return "For "+name+" the number is "+numbers[name]
    else:
        return "For "+name+" was not found"
 
def load_numbers(numbers,filename):
    with open(filename,"r") as f:
        for in_line in f:            
            [name,number] = string.split(in_line,",")
            numbers[name] = number
 
def save_result(result,filename):
    with open(filename,"w") as f:
        f.write(result)
 
phonebookFile=sys.argv[1] 
name=sys.argv[2]
phone_list = {}
 
load_numbers(phone_list,phonebookFile)
print_numbers(phone_list)
number=lookup_number(phone_list,name)
print number
save_result(number,"result.txt")

phonebook.csv:

Giancarlo,0123456789
Gianpaolo,9876541234
Paolo,1231410414

phonebook result with Giancarlo:

For Giancarlo the number is 0123456789

Phonebook code:

File:Phonebook.zip

Matplotlib

Matplotlib require the $DISPLAY environment variable which means a running X server. DataMiner service do not allow a running X server session. So your code must be modified:

#
# author Giancarlo Panichi
#
# Write file image.png
# 
import matplotlib as mpl
mpl.use('Agg')
import matplotlib.pyplot as plt
import numpy as np
....
plt.imshow(image)
plt.savefig('image.png')

Urllib

On DataMiner services is installed Urllib3, see:

• http://urllib3.readthedocs.io/en/latest/user-guide.html

#
# author Giancarlo Panichi
#
# Request Url
# 
import urllib3
http = urllib3.PoolManager()
r = http.request('GET', 'http://httpbin.org/robots.txt')
 
print(r.status)
print(r.data)

StorageHub

StorageHub is the service for accessing to the user's D4Science Workspace. Below we show the StorageHubFacilityPython algorithm, it exhibits the interactions with StorageHub through its Rest API:

StorageHub Facility Python, SAI

Indicates the I/O parameters:

StorageHub Facility Python I/O parameters, SAI

Indicates the python version:

StorageHub Facility Python version, SAI

Indicates the main code python:

StorageHub Facility Python Code, SAI

DataMiner result:

StorageHub Facility Python in DataMiner, SAI

This algorithm shows 5 types of interactions with StorageHub:

• Get Root Info
• Get Item Info (requires an itemId as argument1)
• Get Root Children
• Get Item Children (requires an itemId as argument1)
• Item Download (requires an itemId as argument1)

Python source code of StorageHubFacilityPython:

File:StorageHubFacilityPython.zip

View the demo in DataMiner:

StorageHub Facility Python