sample.json

"datalist": [
 "element1": "content",
 "element2": "content",
 "element3": "content"
 , 
 "element1": "content",
 "element2": "content",
 "element3": "content"
 , 
 "element1": "content",
 "element2": "content",
 "element3": "content"
 

 ]

Python Code

import json

file = "/home/sample.json"

with open(file) as f:
 data = json.load(f)

for elem in data["datalist"]:
 print(elem["element1"] + ' \ ' + elem["element2"] + ' \ ' + elem["element3"])

Good Work Print Result : element1 element2 element3

But, another sample.json

"datalist": [
 "element1": "content",
 "element2": "content",
 "element3": "content"
 , 
 "element1": "content",
 "element3": "content"
 , 
 "element1": "content",
 "element2": "content",
 "element3": "content"
 

 ]

here in second section ; element2 does not exist

if element2 does not exist, it gives KeyError: 'element2'

for elem in data["datalist"]:
 print(elem["element1"] + ' \ ' + elem["element2"] + ' \ ' + elem["element3"])

printing first section but when it comes second section stop and KeyError: 'element2'

how can fix it ? thx.

Python dictionaries have a get method that allows you to return a default value if the key is not found. For example, if d = 1: 2, 3: 4 ; v = 10, d.get(1, v) gives 2, d.get(5, v) gives 10.

So this case you can just give a default value to your code such as elem.get('element2', '[element2 missing]') to signify a missing element in the print outputs and the code will run error-free.

There are multiple options:

• Fix the program, to tolerate missing data


• Fix the data, to be parse-able by the program

Fixing the program

Instead of:

print(elem["element1"] + ' \ ' + elem["element2"] + ' \ ' + elem["element3"])

you need to check whether the elements are there:

if "element1" in elem.keys() and "element2" in elem.keys() and "element3" in 
elem.keys():
 print(elem["element1"] + ' \ ' ...

Fixing the data

Of course, this is easiest: add a key and a value for "element2" in the second dictionary from datalist.