pyecharts/docs/en-us/data_import.md

Data Analysis and Import: Introduces some commonly used data processing modules and libraries. These are not part of the core of pyecharts.

numpy data

add method, support for the numpy.array object, for example:

from pyecharts import Bar
import numpy as np

clothes = ["衬衫", "羊毛衫", "雪纺衫", "裤子", "高跟鞋", "袜子"]
v1 = np.array([5, 20, 36, 10, 75, 90])
bar = Bar("衣服销量")
bar.add("商家A", clothes, v1, is_stack=True)
bar.render()

zip function

In pyecharts.base.Base.add(name, x_axis, y_axis) function, data parameters usually require that the lists have equal length.

from pyecharts import Line

t_data = [(21, '2017-12-01'), (19, '2017-12-02'), (20, '2017-12-03')]
hs, ds = zip(*t_data)
line = Line('High Temperature')
line.add('High', ds, hs)
line.render()

Base.cast function

A data formatting handler that converts source data into pyecharts compliant data.

The detailed conversion format is shown as follows:

1. tuple list
   [(A1, B1), (A2, B2), (A3, B3), (A4, B4)] --> k_lst[ A[i1, i2...] ], v_lst[ B[i1, i2...] ]
2. dict list
   [{A1: B1}, {A2: B2}, {A3: B3}, {A4: B4}] --> k_lst[ A[i1, i2...] ], v_lst[ B[i1, i2...] ]
3. dict {A1: B1, A2: B2, A3: B3, A4: B4} -- > k_lst[ A[i1, i2...] ], v_lst[ B[i1, i2...] ]

o_data = [('A', '34'), ('B', '45'), ('C', '12')]
x, y = Base.cast(o_data)
print(x) # ['A', 'B', 'C']
print(y) # ['34', '45', '12']

The above example can also use the zip function directly.

borax.fetch module

Project url : https://github.com/kinegratii/borax

Install

borax require Python3.5+, you can install this library with the following command :

$ pip install borax

Function definition document

The module uses the fetch function and the signature is shown as follows:

fetch(iterable, key, *keys, default=EMPTY, defaults=None, getter=None)

The meaning of each parameter as follows:

• iterable : data list
• key / keys : index of key-value and attributes access methods
• default : default value, for selecting a single attribute
• defaults : default value dictionary, for selecting multiple attributes
• getter : custom access callback function

It should be noted that the default, defaults and getter parameters must be passed by keyword when used. See more info, please refer to PEP 3102。

Example

Select multiple attributes

from borax.fetch import fetch

objects = [
    {'id': 282, 'name': 'Alice', 'age': 30},
    {'id': 217, 'name': 'Bob', 'age': 56},
    {'id': 328, 'name': 'Charlie', 'age': 56},
]

names, ages = fetch(objects, 'name', 'age')
print(names)
print(ages)

Output

['Alice', 'Bob', 'Charlie']
[30, 56, 56]

networkx library

Project url： https://github.com/networkx/networkx

For complicated relationship charts, you can usenetworkx library to build nodes and link lines, and then pass them to add function. As is shown below :

# coding=utf8

from __future__ import unicode_literals

import networkx as nx
from networkx.readwrite import json_graph
from pyecharts import Graph

g = nx.Graph()
categories = ['网关', '节点']
g.add_node('FF12C904', name='Gateway 1', symbolSize=40, category=0)
g.add_node('FF12CA02', name='Node 11', category=1)
g.add_node('FF12C326', name='Node 12', category=1)
g.add_node('FF45C023', name='Node 111', category=1)
g.add_node('FF230933', name='Node 1111', category=1)

g.add_edge('FF12C904', 'FF12CA02')
g.add_edge('FF12C904', 'FF12C326')
g.add_edge('FF12CA02', 'FF45C023')
g.add_edge('FF45C023', 'FF230933')

g_data = json_graph.node_link_data(g)
eg = Graph('设备最新拓扑图')
eg.add('Devices', nodes=g_data['nodes'], links=g_data['links'], categories=categories)
# eg.show_config()
eg.render()

Result: