Looping through list to store variables in dictionary runs in error - html

Question

What I want to do:
Get user input from HTML form, store input in variables within Django and perform calculations with variables.
To accomplish that, I use following code:
my_var = requst.POST.get('my_var')
To prevent having 'None' stored in 'my_var' when a Django page is first rendered, I usually use
if my_var == None:
my_var = 1
To keep it simple when using a bunch of variables I came up with following idea:
I store all variable names in a list
I loop through list and create a dictionary with variable names as key and user input as value
For that I wrote this code in python which works great:
list_eCar_properties = [
'car_manufacturer',
'car_model',
'car_consumption',]
dict_sample_eCar = {
'car_manufacturer' : "Supr-Duper",
'car_model' : "Lightning 1000",
'car_consumption' : 15.8,
}
dict_user_eCar = {
}
my_dict = {
'car_manufacturer' : None,
'car_model' : None,
'car_consumption' : None,
}
for item in list_eCar_properties:
if my_dict[item] == None:
dict_user_eCar[item] = dict_sample_eCar[item]
else:
dict_user_eCar[item] = my_dict[item]
print(dict_user_eCar)
Works great - when I run the code, a dictionary (dict_user_eCar) is created where user input (in this case None simulated by using a second dictionary my_dict) is stored. When User leaves input blank - Data from dict_sample_eCar is used.
Now, when I transfer that code to my Django view things don't work not as nice anymore. Code as follows:
def Verbrauchsrechner_eAuto(request):
list_eCar_properties = [
'car_manufacturer',
'car_model',
'car_consumption',
]
dict_model_eCar = {
'car_manufacturer' : "Supr-Duper",
'car_model' : "Lightning 1000",
'car_consumption' : 15.8,
}
dict_user_eCar = {
}
for item in list_eCar_properties:
dict_user_eCar[item] = dict_model_eCar[item]
context = {
'dict_user_eCar' : dict_user_eCar,
'dict_model_eCar' : dict_model_eCar,
'list_eCar_properties' : list_eCar_properties,
}
return render(request, 'eAuto/Verbrauchsrechner_eAuto.html', context = context)
Result: The page gets rendered with only the first dictionary entry. All others are left out. In this cases only car_manufacturer gets rendered to html-page.

Answer 1

Sorry folks - as I was reviewing my post, I realized, that I had a major srew-up at the last part's indentation:
context and return both were part of the for-loop which obviously resulted in a page-rendering after the first loop.
I corrected the code as follows:
for item in list_eCar_properties:
dict_user_eCar[item] = dict_model_eCar[item]
context = {
'dict_user_eCar' : dict_user_eCar,
'dict_model_eCar' : dict_model_eCar,
'list_eCar_properties' : list_eCar_properties,
}
return render(request, 'eAuto/Verbrauchsrechner_eAuto.html', context = context)`
Since I didn't want the time I spend to write this post to be wasted - I simply posted it anyway - even though I found the mistake myself.
Lessons learned for a Newbie in programming:
To many comments in your own code might result in a big confusion
Try to be precise and keep code neat and tidy
Do 1 and 2 before writing long posts in stackoverflow
Maybe someone else will benefit from this.