Am trying to read a population_data.json file but when ever i run the code it doesn't display any data in the file and i don't get any Error too? - python-3.7

Question

import json
#Load the data into a list.
filename = 'population_data.json'
with open(filename)as f:`enter code here`
pop_data = json.load(f)
enter code here
#Print the 2010 population data for each country.
for pop_dict in pop_data:`enter code here`
if pop_dict['Year'] == '2010':
country_name = pop_dict['Country Name']
population = int(float(pop_dict['Value']))
print(country_name + " : " + str(population))
Am trying to extract data from a population_data.json file, but whenever i run my code it doesn't show any result and i don't get any Errors, i have save the population data file in the same folder with the code but i still have that same problem, i don't get any result of the data in the shell. i would be glad if someone can help.Thank you .
enter code here
import json
#Load the data into a list.
filename = 'population_data.json'
with open(filename)as f:`enter code here`
pop_data = json.load(f)
enter code here
#Print the 2010 population data for each country.
for pop_dict in pop_data:`enter code here`
if pop_dict['Year'] == '2010':
country_name = pop_dict['Country Name']
population = int(float(pop_dict['Value']))
print(country_name + " : " + str(population))

Answer 1

I would suggest starting your script in the python debugger (pdb). You can start it either by starting your script like this:
python3 -m pdb your_script.py
or by importing the pdb module. Adding the following line into your python file (for example after import json, or any other):
import pdb; pdb.set_trace()
Once it is loaded, the debugger stops at the first instruction and shows the debugger promt (Pdb) . Continue execution line by line by typing next and hitting ENTER until you hit a line where something interesting is happening. The debugger prints always the next instruction and the script path and line.
Debugger output is added below, everything after (Pdb) you have to type and confirm with ENTER
(Pdb) next
> /path/to/your_script.py(7)<module>()
-> pop_data = json.load(f)
(Pdb) next
> /path/to/your_script.py(11)<module>()
-> for pop_dict in pop_data:
Now let the debugger print contents of a variable
(Pdb) p pop_data
{"Probably": "something", "you": "don't expect here"}
I suspect either the for loop yields 0 pop_dicts and therefore the loop body is never executed, or no pop_dict key Year has value 2010 and the if body is never executed.
Alternative to type next often (== single stepping): set a break point on a specific line (your_script.py:11), and continue execution until the breakpoint is hit
(Pdb) break your_script.py:11
Breakpoint 1 at /path/to/your_script.py:11
(Pdb) continue
> /path/to/your_script.py(11)<module>()
-> for pop_dict in pop_data:
(Pdb)
For additional debugger commands see pdb commands