JSON. Dumps() function parsing

json.dumps()

json.dumps Will a Python The data structure is converted to JSON

import json
data = {
    
    'name' : 'myname',
    'age' : 100,
}
json_str = json.dumps(data)

json Some usage of Library

Method	effect
json.dumps()	take python The object is encoded as Json character string
json.loads()	take Json The string is decoded into python object
json.dump()	take python Convert objects in to json Save to file
json.load()	In the file json In the form of python Object extraction

json.dump() and json.dumps() The difference between

json.dumps() It's a python Object conversion to json A process of objects , The result is a string .
json.dump() It's a python Object conversion to json Object generates a fp File stream for , Related to documents .

json Parameters

json.dumps(obj, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, encoding="utf-8", default=None, sort_keys=False, **kw)

• obj: Turn it into json The object of .
• sort_keys =True: Is to tell the encoder to sort according to the dictionary (a To z) Output . If it's a dictionary type python object , Just sort the keywords according to the dictionary .
• indent: Parameters are indented according to the data format , Read more clearly .
• separators: It's a separator , The meaning of the parameter is different dict Separator between items and dict Intra item key and value Separator between , hold ： and , The following spaces have been removed .

import json

x = {
    'name':' Have a guess ','age':19,'city':' sichuan '}
# use dumps take python Code as json character string 
y = json.dumps(x)
print(y)
i = json.dumps(x,separators=(',',':'))
print(i)
#  Output results 
{
    "name": "\u4f60\u731c", "age": 19, "city": "\u56db\u5ddd"}
{
    "name":"\u4f60\u731c","age":19,"city":"\u56db\u5ddd"}

• skipkeys： The default value is False, If dict Of keys The data in is not python Basic type (str,unicode,int,long,float,bool,None), Set to False when , Will report TypeError Error of . This is set to True, You will skip this kind of key .
• ensure_ascii=True： Default output ASCLL code , If this should be False, You can output Chinese .
• check_circular： If check_circular by false, Then skip the circular reference check on the container type , Circular references will cause overflow errors ( Or worse ).
• allow_nan： If allow_nan For false , be ValueError Floating point values out of range will be serialized (nan、inf、-inf), Strictly observe JSON standard , Instead of using JavaScript Equal value (nan、Infinity、-Infinity).
• default：default(obj) It's a function , It should return a serializable obj Version or type error . Default values only cause type errors .