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Get value not none - Printable Version

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Get value not none - Clives - Feb-20-2020

Greetings,

When I run the code I get none, not the drop-down value ie: DEV, TEMP or PROD.
I am trying to exclude the none and get the value of source_.

Any assistance appreciated.

Regards,

Clive


import urllib
import urllib.parse
from urllib.parse import urlparse
import urllib.request
from   urllib.request import urlopen

def get_method_dropdown():
    methods = ['DEV', 'TEMP', 'PROD']
    method_widget = widgets.Dropdown(
        options=methods,
        value=methods[0],
        description='Env:'
    )
    display(method_widget)

#    methods_widget.on_trait_change(filter_istd_qc_by_method,'value')

    return method_widget 
		
d = widgets.Dropdown(
        options=['DEV', 'TEMP', 'PROD'], value='TEMP'
)
display(d)
#print(d.value)


output2 = widgets.Output()
#display(d, output2)

def get_value(change):
	print(change['new'])
	#print(select_variable.value)
	#clear_output()

source_ = d.observe(get_value, names='value')  ### get_value, names='value'

#print(source_)

if source_ == 'DEV':
	print("DEV = Output")
elif source_ == 'TEMP':
    print("TEMP = Output")


RE: Get value not none - buran - Feb-20-2020

what is widgets and where it comes from?

RE: Get value not none - Clives - Feb-20-2020

Apologies I forgot to add the ipywidgets 

from ipywidgets import interact, widgets
from IPython.display import display

import urllib
import urllib.parse
from urllib.parse import urlparse
import urllib.request
from   urllib.request import urlopen
 
def get_method_dropdown():
    methods = ['DEV', 'TEMP', 'PROD']
    method_widget = widgets.Dropdown(
        options=methods,
        value=methods[0],
        description='Env:'
    )
    display(method_widget)
 
#    methods_widget.on_trait_change(filter_istd_qc_by_method,'value')
 
    return method_widget 
         
d = widgets.Dropdown(
        options=['DEV', 'TEMP', 'PROD'], value='TEMP'
)
display(d)
#print(d.value)
 
 
output2 = widgets.Output()
#display(d, output2)
 
def get_value(change):
    print(change['new'])
    #print(select_variable.value)
    #clear_output()
 
source_ = d.observe(get_value, names='value')  ### get_value, names='value'
 
#print(source_)
 
if source_ == 'DEV':
    print("DEV = Output")
elif source_ == 'TEMP':
    print("TEMP = Output")


RE: Get value not none - Clives - Feb-21-2020

When I run the code I get None.

I am trying to find an on_click or on_change event to get the "new" value ie if the user chooses Dev, Test or Prod.

I would appreciate any assistance.

Thanks,

Clive

RE: Get value not none - Clives - Feb-21-2020

I had tried if and while loops, nothing worked.

Eventually I tried if !=, this worked.
Thanks for the help


if source_ != None:
    print(source_)
This worked!!