如何用Python打印JSON文件?
当前回答
使用pprint:https://docs.python.org/3.6/library/pprint.html
import pprint
pprint.pprint(json)
print()与pprint.pprint()比较
print(json)
{'feed': {'title': 'W3Schools Home Page', 'title_detail': {'type': 'text/plain', 'language': None, 'base': '', 'value': 'W3Schools Home Page'}, 'links': [{'rel': 'alternate', 'type': 'text/html', 'href': 'https://www.w3schools.com'}], 'link': 'https://www.w3schools.com', 'subtitle': 'Free web building tutorials', 'subtitle_detail': {'type': 'text/html', 'language': None, 'base': '', 'value': 'Free web building tutorials'}}, 'entries': [], 'bozo': 0, 'encoding': 'utf-8', 'version': 'rss20', 'namespaces': {}}
pprint.pprint(json)
{'bozo': 0,
'encoding': 'utf-8',
'entries': [],
'feed': {'link': 'https://www.w3schools.com',
'links': [{'href': 'https://www.w3schools.com',
'rel': 'alternate',
'type': 'text/html'}],
'subtitle': 'Free web building tutorials',
'subtitle_detail': {'base': '',
'language': None,
'type': 'text/html',
'value': 'Free web building tutorials'},
'title': 'W3Schools Home Page',
'title_detail': {'base': '',
'language': None,
'type': 'text/plain',
'value': 'W3Schools Home Page'}},
'namespaces': {},
'version': 'rss20'}
其他回答
为了能够从命令行进行漂亮的打印并能够控制缩进等,您可以设置类似于以下内容的别名:
alias jsonpp="python -c 'import sys, json; print json.dumps(json.load(sys.stdin), sort_keys=True, indent=2)'"
然后以以下方式之一使用别名:
cat myfile.json | jsonpp
jsonpp < myfile.json
这里有一个简单的例子,可以用Python将JSON以一种很好的方式打印到控制台,而不需要将JSON作为本地文件存储在计算机上:
import pprint
import json
from urllib.request import urlopen # (Only used to get this example)
# Getting a JSON example for this example
r = urlopen("https://mdn.github.io/fetch-examples/fetch-json/products.json")
text = r.read()
# To print it
pprint.pprint(json.loads(text))
您可以尝试pprintjson。
安装
$ pip3 install pprintjson
用法
使用pprintjson CLI从文件中精确打印JSON。
$ pprintjson "./path/to/file.json"
使用pprintjson CLI从stdin打印JSON。
$ echo '{ "a": 1, "b": "string", "c": true }' | pprintjson
使用pprintjson CLI从字符串中精确打印JSON。
$ pprintjson -c '{ "a": 1, "b": "string", "c": true }'
从缩进为1的字符串中精确打印JSON。
$ pprintjson -c '{ "a": 1, "b": "string", "c": true }' -i 1
从字符串中精确打印JSON并将输出保存到文件output.JSON。
$ pprintjson -c '{ "a": 1, "b": "string", "c": true }' -o ./output.json
输出
一个非常简单的方法是使用rich。使用此方法,您还可以突出显示json
此方法从名为config.json的json文件中读取数据
from rich import print_json
setup_type = open('config.json')
data = json.load(setup_type)
print_json(data=data)
TL;DR:在很多方面,也可以考虑打印(yaml.dump(j,sort_keys=False))
对于大多数用途,缩进应该做到:
print(json.dumps(parsed, indent=2))
Json结构基本上是树结构。当我试图找到一些更奇特的东西时,我偶然发现了这张漂亮的纸,上面描绘了其他形式的漂亮树木,可能很有趣:https://blog.ouseful.info/2021/07/13/exploring-the-hierarchical-structure-of-dataframes-and-csv-data/.
它有一些交互树,甚至还附带了一些代码,包括以下折叠树:
其他示例包括使用plotly以下是plotly的代码示例:
import plotly.express as px
fig = px.treemap(
names = ["Eve","Cain", "Seth", "Enos", "Noam", "Abel", "Awan", "Enoch", "Azura"],
parents = ["", "Eve", "Eve", "Seth", "Seth", "Eve", "Eve", "Awan", "Eve"]
)
fig.update_traces(root_color="lightgrey")
fig.update_layout(margin = dict(t=50, l=25, r=25, b=25))
fig.show()
并使用treelib。注意,这个github还提供了很好的可视化效果。下面是一个使用treelib的示例:
#%pip install treelib
from treelib import Tree
country_tree = Tree()
# Create a root node
country_tree.create_node("Country", "countries")
# Group by country
for country, regions in wards_df.head(5).groupby(["CTRY17NM", "CTRY17CD"]):
# Generate a node for each country
country_tree.create_node(country[0], country[1], parent="countries")
# Group by region
for region, las in regions.groupby(["GOR10NM", "GOR10CD"]):
# Generate a node for each region
country_tree.create_node(region[0], region[1], parent=country[1])
# Group by local authority
for la, wards in las.groupby(['LAD17NM', 'LAD17CD']):
# Create a node for each local authority
country_tree.create_node(la[0], la[1], parent=region[1])
for ward, _ in wards.groupby(['WD17NM', 'WD17CD']):
# Create a leaf node for each ward
country_tree.create_node(ward[0], ward[1], parent=la[1])
# Output the hierarchical data
country_tree.show()
基于此,我创建了一个将json转换为树的函数:
from treelib import Node, Tree, node
def create_node(tree, s, counter_byref, verbose, parent_id=None):
node_id = counter_byref[0]
if verbose:
print(f"tree.create_node({s}, {node_id}, parent={parent_id})")
tree.create_node(s, node_id, parent=parent_id)
counter_byref[0] += 1
return node_id
def to_compact_string(o):
if type(o) == dict:
if len(o)>1:
raise Exception()
k,v =next(iter(o.items()))
return f'{k}:{to_compact_string(v)}'
elif type(o) == list:
if len(o)>1:
raise Exception()
return f'[{to_compact_string(next(iter(o)))}]'
else:
return str(o)
def to_compact(tree, o, counter_byref, verbose, parent_id):
try:
s = to_compact_string(o)
if verbose:
print(f"# to_compact({o}) ==> [{s}]")
create_node(tree, s, counter_byref, verbose, parent_id=parent_id)
return True
except:
return False
def json_2_tree(o , parent_id=None, tree=None, counter_byref=[0], verbose=False, compact_single_dict=False, listsNodeSymbol='+'):
if tree is None:
tree = Tree()
parent_id = create_node(tree, '+', counter_byref, verbose)
if compact_single_dict and to_compact(tree, o, counter_byref, verbose, parent_id):
# no need to do more, inserted as a single node
pass
elif type(o) == dict:
for k,v in o.items():
if compact_single_dict and to_compact(tree, {k:v}, counter_byref, verbose, parent_id):
# no need to do more, inserted as a single node
continue
key_nd_id = create_node(tree, str(k), counter_byref, verbose, parent_id=parent_id)
if verbose:
print(f"# json_2_tree({v})")
json_2_tree(v , parent_id=key_nd_id, tree=tree, counter_byref=counter_byref, verbose=verbose, listsNodeSymbol=listsNodeSymbol, compact_single_dict=compact_single_dict)
elif type(o) == list:
if listsNodeSymbol is not None:
parent_id = create_node(tree, listsNodeSymbol, counter_byref, verbose, parent_id=parent_id)
for i in o:
if compact_single_dict and to_compact(tree, i, counter_byref, verbose, parent_id):
# no need to do more, inserted as a single node
continue
if verbose:
print(f"# json_2_tree({i})")
json_2_tree(i , parent_id=parent_id, tree=tree, counter_byref=counter_byref, verbose=verbose,listsNodeSymbol=listsNodeSymbol, compact_single_dict=compact_single_dict)
else: #node
create_node(tree, str(o), counter_byref, verbose, parent_id=parent_id)
return tree
例如:
import json
j = json.loads('{"2": 3, "4": [5, 6], "7": {"8": 9}}')
json_2_tree(j ,verbose=False,listsNodeSymbol='+' ).show()
给予:
+
├── 2
│ └── 3
├── 4
│ └── +
│ ├── 5
│ └── 6
└── 7
└── 8
└── 9
虽然
json_2_tree(j ,listsNodeSymbol=None, verbose=False ).show()
+
├── 2
│ └── 3
├── 4
│ ├── 5
│ └── 6
└── 7
└── 8
└── 9
And
json_2_tree(j ,compact_single_dict=True,listsNodeSymbol=None).show()
+
├── 2:3
├── 4
│ ├── 5
│ └── 6
└── 7:8:9
正如你所看到的,有不同的树,这取决于他想要的明确与紧凑程度。我最喜欢的一个,也是最紧凑的一个可能是使用yaml:
import yaml
j = json.loads('{"2": "3", "4": ["5", "6"], "7": {"8": "9"}}')
print(yaml.dump(j, sort_keys=False))
简洁明了:
'2': '3'
'4':
- '5'
- '6'
'7':
'8': '9'