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JSON stands for JavaScript Object Notation. It means that a script [executable] file which is made of text in a programming language, is used to
store and transfer the data. Python supports JSON through a built-in package called json. To use this feature, we import the JSON package in Python script. The text in JSON is done through quoted-string which contains a value in key-value mapping within { }. It is similar to the dictionary in Python.
Note: For more information, refer to Read, Write and Parse JSON using
Python
Function Used:
- json.dumps[]
- json.dump[]
Syntax: json.dumps[dict, indent]
Parameters:
- dictionary – name of dictionary which should be converted to JSON object.
- indent – defines the number of units for indentation
Syntax: json.dump[dict, file_pointer]
Parameters:
- dictionary – name of dictionary which should be converted to JSON object.
- file pointer – pointer of the file opened in write or append mode.
Example 1:
Python3
import json
dictionary ={
"id": "04",
"name": "sunil",
"department": "HR"
}
json_object = json.dumps[dictionary, indent = 4]
print[json_object]
Output
{
"id": "04",
"name": "sunil",
"department": "HR"
}Output:
{
"department": "HR",
"id": "04",
"name": "sunil"
}Example 2:
Python3
import json
dictionary ={
"name" : "sathiyajith",
"rollno"
: 56,
"cgpa" : 8.6,
"phonenumber" : "9976770500"
}
with open["sample.json", "w"] as outfile:
json.dump[dictionary, outfile]
Output:
For completeness, we should include ConfigParser and configparser which are part of the standard library in Python 2 and 3, respectively. This module reads and writes to a config/ini file and [at least in Python 3] behaves in a lot of ways like a dictionary. It has the added benefit that you can store multiple dictionaries into separate sections of your config/ini file and recall them. Sweet!
Python 2.7.x example.
import ConfigParser
config = ConfigParser.ConfigParser[]
dict1 = {'key1':'keyinfo', 'key2':'keyinfo2'}
dict2 = {'k1':'hot', 'k2':'cross', 'k3':'buns'}
dict3 = {'x':1, 'y':2, 'z':3}
# Make each dictionary a separate section in the configuration
config.add_section['dict1']
for key in dict1.keys[]:
config.set['dict1', key, dict1[key]]
config.add_section['dict2']
for key in dict2.keys[]:
config.set['dict2', key, dict2[key]]
config.add_section['dict3']
for key in dict3.keys[]:
config.set['dict3', key, dict3[key]]
# Save the configuration to a file
f = open['config.ini', 'w']
config.write[f]
f.close[]
# Read the configuration from a file
config2 = ConfigParser.ConfigParser[]
config2.read['config.ini']
dictA = {}
for item in config2.items['dict1']:
dictA[item[0]] = item[1]
dictB = {}
for item in config2.items['dict2']:
dictB[item[0]] = item[1]
dictC = {}
for item in config2.items['dict3']:
dictC[item[0]] = item[1]
print[dictA]
print[dictB]
print[dictC]
Python 3.X example.
import configparser
config = configparser.ConfigParser[]
dict1 = {'key1':'keyinfo', 'key2':'keyinfo2'}
dict2 = {'k1':'hot', 'k2':'cross', 'k3':'buns'}
dict3 = {'x':1, 'y':2, 'z':3}
# Make each dictionary a separate section in the configuration
config['dict1'] = dict1
config['dict2'] = dict2
config['dict3'] = dict3
# Save the configuration to a file
f = open['config.ini', 'w']
config.write[f]
f.close[]
# Read the configuration from a file
config2 = configparser.ConfigParser[]
config2.read['config.ini']
# ConfigParser objects are a lot like dictionaries, but if you really
# want a dictionary you can ask it to convert a section to a dictionary
dictA = dict[config2['dict1'] ]
dictB = dict[config2['dict2'] ]
dictC = dict[config2['dict3']]
print[dictA]
print[dictB]
print[dictC]
Console output
{'key2': 'keyinfo2', 'key1': 'keyinfo'}
{'k1': 'hot', 'k2': 'cross', 'k3': 'buns'}
{'z': '3', 'y': '2', 'x': '1'}
Contents of config.ini
[dict1]
key2 = keyinfo2
key1 = keyinfo
[dict2]
k1 = hot
k2 = cross
k3 = buns
[dict3]
z = 3
y = 2
x = 1