how to select the dictionary according to the inputs in python?

Question

I have multiple dictionaries which contain some information, for example:

northLine = {
    'capacity': 100,
    'name': 'Delhi' 
}
eastLine = {
    'capacity': 110,
    'name': 'Rajasthan' 
}
westLine = {
    'capacity': 120,
    'name': 'Orissa' 
}
southLine = {
    'capacity': 130,
    'name': 'J&K' 
}

I have an input list that basically tells us that which line should we use, for example, if it says that [west, north] then it should pick the values from west and north lines only. My code:

northLine = {
    'capacity': 100,
    'name': 'Delhi' 
}
eastLine = {
    'capacity': 110,
    'name': 'Rajasthan' 
}
westLine = {
    'capacity': 120,
    'name': 'Orissa'
}
southLine = {
    'capacity': 130,
    'name': 'J&K' 
}
listOfZone = ['west', 'south']
for i in listOfState:
    print(i+'Line'['name'])

Can somebody please help?

You should use a dictionary with key `west`, `north` etc that point to the appropriate dicts. — Mark, Mar 07 '21 at 18:05
I think @MarkM solution is the best, but if you want you can use `eval`, like so `print(eval(i+"Line")[name])`, [but keep in mind it is considered bad practice](https://stackoverflow.com/questions/1832940/why-is-using-eval-a-bad-practice) — gionni, Mar 07 '21 at 18:11
yes, that's why I have decided to change my method, this can reduce the unnecessary efforts. — Vesper, Mar 07 '21 at 18:14

score 3 · Accepted Answer · answered Mar 07 '21 at 18:07

When you need to reference data by a key value, you use a dict. You already did that for each direction. Now you need to do it for your four directions:

line_dict = {
    "north": {
        'capacity': 100,
        'name': 'Delhi' 
    }
    "east": {
        'capacity': 110,
        'name': 'Rajasthan' 
    }
    "west": {
        'capacity': 120,
        'name': 'Orissa'
    }
    "south": {
        'capacity': 130,
        'name': 'J&K' 
    }
}

Now you iterate through your directions, choosing the appropriate dict and the values from the inner dict for each of those directions.

score 2 · Answer 2 · answered Mar 07 '21 at 18:18

you can use code below

dict_items = {

    "north": {
        'capacity': 100,
        'name': 'Delhi'
    },
    "east": {
        'capacity': 110,
        'name': 'Rajasthan'
    },
    "west": {
        'capacity': 120,
        'name': 'Orissa'
    },
    "south": {
        'capacity': 130,
        'name': 'J&K'
    }
}

listOfZones = ['north', 'east'] # List of zones
for zone in listOfZones:
    item = dict_items.get(zone)
    if item:
        print(f"Zone Name- {zone}")
        print(dict_items[zone])

how to select the dictionary according to the inputs in python?

2 Answers2