pandas基础-Python3
未完
for examples:
example 1:
# Code based on Python 3.x
# _*_ coding: utf-8 _*_
# __Author: "LEMON" import pandas as pd d = pd.date_range('', periods=7)
aList = list(range(1,8)) df = pd.DataFrame(aList, index=d, columns=[' '])
df.index.name = 'value' print('----------df.index---------')
print(df.index) print('---------df.columns---------')
print(df.columns) print('----------df.values---------')
print(df.values) print('----------df.describe--------')
print(df.describe) print('----------information details--------')
print(df.head(2)) #获取开始的n条记录
print(df.tail(3)) #后去最后的n条记录
print(df[3:5]) # df[a:b]，获取第a+1至第b-1的记录
运行结果如下：
----------df.index---------
DatetimeIndex(['2017-01-01', '2017-01-02', '2017-01-03', '2017-01-04',
'2017-01-05', '2017-01-06', '2017-01-07'],
dtype='datetime64[ns]', name='value', freq='D')
---------df.columns---------
Index([' '], dtype='object')
----------df.values---------
[[1]
[2]
[3]
[4]
[5]
[6]
[7]]
----------df.describe--------
<bound method NDFrame.describe of
value
2017-01-01 1
2017-01-02 2
2017-01-03 3
2017-01-04 4
2017-01-05 5
2017-01-06 6
2017-01-07 7>
----------information details-------- value
2017-01-01 1
2017-01-02 2 value
2017-01-05 5
2017-01-06 6
2017-01-07 7 value
2017-01-04 4
2017-01-05 5
example 2:
# Code based on Python 3.x
# _*_ coding: utf-8 _*_
# __Author: "LEMON" from pandas import Series, DataFrame
import pandas as pd data = {'state': ['Ohino', 'Ohino', 'Ohino', 'Nevada', 'Nevada'],
'year': [2000, 2001, 2002, 2001, 2002],
'pop': [1.5, 1.7, 3.6, 2.4, 2.9]} df = DataFrame(data, index=list(range(1, 6)),
columns=['year', 'state', 'pop', 'name'])
print(df) print('\n', '---------------')
print(list(df.ix[3])) print('\n', '---------------')
print(list(df['year'])) aList = ['', '', '', '']
bList = ['aa', 'bb', 'cb', 'dd']
cList = ['lemon', 'apple', 'orange', 'banana'] d = {'num': aList, 'char': bList, 'fruit': cList} df1 = DataFrame(d, index=['a', 'b', 'c', 'd'])
# df2 = DataFrame(bList)
print('\n', '---------------')
print(df1)
#print(df1.num) print('\n', '---------------')
print(df1.ix['b']) # 获取索引号为 'b' 的行的数据 print('\n', '---------------')
print(df1.ix[:2, 1:3]) # 以切片形式获取部分数据
运行结果如下：
year state pop name
1 2000 Ohino 1.5 NaN
2 2001 Ohino 1.7 NaN
3 2002 Ohino 3.6 NaN
4 2001 Nevada 2.4 NaN
5 2002 Nevada 2.9 NaN ---------------
[2002, 'Ohino', 3.6000000000000001, nan] ---------------
[2000, 2001, 2002, 2001, 2002] ---------------
char fruit num
a aa lemon 1
b bb apple 2
c cb orange 3
d dd banana 4 ---------------
char bb
fruit apple
num 2
Name: b, dtype: object ---------------
fruit num
a lemon 1
b apple 2
example 3 (数据选择-DateFrame.loc()和DateFrame.iloc()) :
# Code based on Python 3.x
# _*_ coding: utf-8 _*_
# __Author: "LEMON" from matplotlib.finance import quotes_historical_yahoo_ochl
from datetime import date
import pandas as pd today = date.today() start =(today.year-4, today.month+11, today.day-1)
end = (today.year-4, today.month+11, today.day+3)
quotes = quotes_historical_yahoo_ochl('AMX', start, end)
# each items in quotes is type of "tuple" fields = ['date', 'open', 'close', 'high', 'low', 'volume'] quotes1 = []
for t in quotes:
t1 = list(t)
quotes1.append(t1)
# each items in quotes1 is type of "list" for i in range(0, len(quotes1)):
quotes1[i][0] = date.fromordinal(int(quotes1[i][0]))
# date format is changed df = pd.DataFrame(quotes1, index=range(1, len(quotes1)+1), columns=fields)
# df = pd.DataFrame(quotes1, index=['a','b','c','d','e'], columns=fields)
# df = df.drop(['date'], axis=1) print(df) print(df['close'].mean()) #计算某列的mean值
# print(dict(df.mean())['close']) #计算某列的mean值 print(df.sort_values(['open'],ascending = True)) #进行排序，默认(True)是升序
print(df[df.open>=21].date) # index是整数
print(df.loc[2:5, 'date':'close'])
print(df.loc[[2,5],['open','close']])
# loc方法在行和列的选择上是标签形式，可以是连续的选择，或者单个行或列的选择
print(df.iloc[1:6,0:4]) #iloc方法以切片形式选取数据 # index是标签形式
# print(df.loc['a':'d', 'date':'close'])
# print(df.loc[['b','e'],['open','close']])
# loc方法在行和列的选择上是标签形式，可以是连续的选择，或者单个行或列的选择 # 根据判断条件来选择数据
print(df[(df.index>=4) & (df.open>=21)]) # DateFrame 的均值
print(df.mean()) # 默认计算每列的均值
print(df.mean(axis=1)) # axis=1是计算每行的均值 '''
# 获取多只股票的信息
d1 = (today.year-1, today.month+11, today.day) aList = ['BABA', 'KO', 'AMX'] # List of the stock code of companys for i in aList:
q1 = quotes_historical_yahoo_ochl(i, d1, today)
df1 = pd.DataFrame(q1)
print(df1)
'''
运行结果如下：
date open close high low volume
1 2013-12-03 20.999551 21.156955 21.184731 20.795851 5152600.0
2 2013-12-04 20.971773 20.934738 21.064364 20.703261 5174400.0
3 2013-12-05 20.518079 20.545857 21.231027 20.379193 7225600.0
4 2013-12-06 21.166215 20.601411 21.295841 20.536598 9989500.0
20.80974025
20.80974025
date open close high low volume
3 2013-12-05 20.518079 20.545857 21.231027 20.379193 7225600.0
2 2013-12-04 20.971773 20.934738 21.064364 20.703261 5174400.0
1 2013-12-03 20.999551 21.156955 21.184731 20.795851 5152600.0
4 2013-12-06 21.166215 20.601411 21.295841 20.536598 9989500.0
4 2013-12-06
Name: date, dtype: object runfile('E:/Python/Anaco/test_yahoo.py', wdir='E:/Python/Anaco')
date open close high low volume
1 2013-12-03 20.999551 21.156955 21.184731 20.795851 5152600.0
2 2013-12-04 20.971773 20.934738 21.064364 20.703261 5174400.0
3 2013-12-05 20.518079 20.545857 21.231027 20.379193 7225600.0
4 2013-12-06 21.166215 20.601411 21.295841 20.536598 9989500.0
20.80974025
date open close high low volume
3 2013-12-05 20.518079 20.545857 21.231027 20.379193 7225600.0
2 2013-12-04 20.971773 20.934738 21.064364 20.703261 5174400.0
1 2013-12-03 20.999551 21.156955 21.184731 20.795851 5152600.0
4 2013-12-06 21.166215 20.601411 21.295841 20.536598 9989500.0
4 2013-12-06
Name: date, dtype: object
date open close
2 2013-12-04 20.971773 20.934738
3 2013-12-05 20.518079 20.545857
4 2013-12-06 21.166215 20.601411
open close
2 20.971773 20.934738
5 NaN NaN
date open close high
2 2013-12-04 20.971773 20.934738 21.064364
3 2013-12-05 20.518079 20.545857 21.231027
4 2013-12-06 21.166215 20.601411 21.295841
date open close high low volume
4 2013-12-06 21.166215 20.601411 21.295841 20.536598 9989500.0
open 2.091390e+01
close 2.080974e+01
high 2.119399e+01
low 2.060373e+01
volume 6.885525e+06
dtype: float64
1 1.030537e+06
2 1.034897e+06
3 1.445137e+06
4 1.997917e+06
dtype: float64
examples 4: 求微软公司（MSFT）2015年每月股票收盘价的平均值。
# Code based on Python 3.x
# _*_ coding: utf-8 _*_
# __Author: "LEMON" # 求微软公司（MSFT）2015年每月股票收盘价的平均值。 #Method 1 (update) from matplotlib.finance import quotes_historical_yahoo_ochl
from datetime import date
import pandas as pd
from datetime import datetime today = date.today()
fields = ['date', 'open', 'close', 'high', 'low', 'volume'] start = (today.year - 3, today.month, today.day)
end = today
quotes = quotes_historical_yahoo_ochl('MSFT', start, end)
# each items in quotes is type of "tuple" df = pd.DataFrame(quotes, index=range(1, len(quotes) + 1), columns=fields) list = df.date.tolist()
list1 = []
for x in list:
x = date.fromordinal(int(x))
y = date.strftime(x, '%Y/%m')
list1.append(y) # print(list1)
df1 = df.set_index([list1]).drop('date',axis=1)
# 把日期设置成索引，并删除“date”列 df2 = df1['2015/01':'2015/12'] #选取2015年的数据
print(df2.groupby(df2.index).close.mean())
# 将数据按index进行聚类分析，并计算收盘价“close”的均值 # -----------------------------------------------------
# #Method 1 (old)
#
# from matplotlib.finance import quotes_historical_yahoo_ochl
# from datetime import date
# import pandas as pd
# from datetime import datetime
#
#
# today = date.today()
# fields = ['date', 'open', 'close', 'high', 'low', 'volume']
#
# start2 = (today.year - 3, today.month, today.day)
# end2 = today
# quotes2 = quotes_historical_yahoo_ochl('MSFT', start2, end2)
# # each items in quotes is type of "tuple"
#
# quotes3 = []
# for t in quotes2:
# t1 = list(t)
# quotes3.append(t1)
# # each items in quotes1 is type of "list"
#
# for i in range(0, len(quotes3)):
# quotes3[i][0] = date.fromordinal(int(quotes3[i][0]))
# # date format is changed
#
# df2 = pd.DataFrame(quotes3, index=range(1, len(quotes3) + 1), columns=fields)
#
# df2['date'] = pd.to_datetime(df2['date'], format='%Y-%m-%d') # 转化成pandas的日期格式
# # print(df2)
#
# start2015 = datetime(2015,1,1)
# end2015 = datetime(2015,12,31)
# # start2015 = datetime.strptime('2015-1-1', '%Y-%m-%d')
# # # 将'2015-1-1'字符串设置为时间格式
# # end2015 = datetime.strptime('2015-12-31', '%Y-%m-%d')
# # # 将'2015-12-31'字符串设置为时间格式
#
# df1 = df2[(start2015 <= df2.date) & (df2.date <= end2015)]
# # 通过时间条件来选择2015年的记录
#
# permonth1 = df1.date.dt.to_period('M') #data per month
# g_month1 = df1.groupby(permonth1)
# g_closequotes = g_month1['close']
#
# s_month = g_closequotes.mean() # s_month is Series class
# s_month.index.name = 'date_index'
#
# print(s_month)
# ----------------------------------------------------- # =================================================================
# Method 2 # from matplotlib.finance import quotes_historical_yahoo_ochl
# from datetime import date
#
# import pandas as pd
# today = date.today()
# start = (today.year-3, today.month, today.day)
# quotesMS = quotes_historical_yahoo_ochl('MSFT', start, today)
# attributes=['date','open','close','high','low','volume']
# quotesdfMS = pd.DataFrame(quotesMS, columns= attributes)
#
#
#
# list = []
# for i in range(0, len(quotesMS)):
# x = date.fromordinal(int(quotesMS[i][0]))
# y = date.strftime(x, '%y/%m/%d')
# list.append(y)
# quotesdfMS.index = list
# quotesdfMS = quotesdfMS.drop(['date'], axis = 1)
# list = []
# quotesdfMS15 = quotesdfMS['15/01/01':'15/12/31']
#
# print(quotesdfMS15)
#
# for i in range(0, len(quotesdfMS15)):
# list.append(int(quotesdfMS15.index[i][3:5])) #get month just like '02'
# quotesdfMS15['month'] = list
# print(quotesdfMS15.groupby('month').mean().close)
# =================================================================
输出结果如下：
2015/01 43.124433
2015/02 40.956772
2015/03 40.203918
2015/04 41.477685
2015/05 45.472291
2015/06 44.145879
2015/07 43.807541
2015/08 43.838895
2015/09 42.114155
2015/10 47.082882
2015/11 52.252878
2015/12 53.916431
Name: close, dtype: float64
pandas基础-Python3的更多相关文章
- Pandas 基础(1) - 初识及安装 yupyter
Hello, 大家好, 昨天说了我会再更新一个关于 Pandas 基础知识的教程, 这里就是啦......Pandas 被广泛应用于数据分析领域, 是一个很好的分析工具, 也是我们后面学习 machi ...
- 利用Python进行数据分析(12) pandas基础: 数据合并
pandas 提供了三种主要方法可以对数据进行合并: pandas.merge()方法:数据库风格的合并: pandas.concat()方法:轴向连接,即沿着一条轴将多个对象堆叠到一起: 实例方法c ...
- 利用Python进行数据分析(9) pandas基础: 汇总统计和计算
pandas 对象拥有一些常用的数学和统计方法. 例如,sum() 方法,进行列小计: sum() 方法传入 axis=1 指定为横向汇总,即行小计: idxmax() 获取最大值对应的索 ...
- 利用Python进行数据分析(8) pandas基础: Series和DataFrame的基本操作
一.reindex() 方法:重新索引 针对 Series 重新索引指的是根据index参数重新进行排序. 如果传入的索引值在数据里不存在,则不会报错,而是添加缺失值的新行. 不想用缺失值,可以用 ...
- 利用Python进行数据分析(7) pandas基础: Series和DataFrame的简单介绍
一.pandas 是什么 pandas 是基于 NumPy 的一个 Python 数据分析包,主要目的是为了数据分析.它提供了大量高级的数据结构和对数据处理的方法. pandas 有两个主要的数据结构 ...
- Pandas基础学习与Spark Python初探
摘要:pandas是一个强大的Python数据分析工具包,pandas的两个主要数据结构Series(一维)和DataFrame(二维)处理了金融,统计,社会中的绝大多数典型用例科学,以及许多工程领域 ...
- numpy&pandas基础
numpy基础 import numpy as np 定义array In [156]: np.ones(3) Out[156]: array([1., 1., 1.]) In [157]: np.o ...
- 基于 Python 和 Pandas 的数据分析(2) --- Pandas 基础
在这个用 Python 和 Pandas 实现数据分析的教程中, 我们将明确一些 Pandas 基础知识. 加载到 Pandas Dataframe 的数据形式可以很多, 但是通常需要能形成行和列的数 ...
- python学习笔记（四）：pandas基础
pandas 基础 serise import pandas as pd from pandas import Series, DataFrame obj = Series([4, -7, 5, 3] ...
随机推荐
- ASP.NET Core MVC/WebAPi 模型绑定探索
前言 相信一直关注我的园友都知道,我写的博文都没有特别枯燥理论性的东西,主要是当每开启一门新的技术之旅时,刚开始就直接去看底层实现原理,第一会感觉索然无味,第二也不明白到底为何要这样做,所以只有当你用 ...
- ASP.NET Aries 入门开发教程8：树型列表及自定义右键菜单
前言: 前面几篇重点都在讲普通列表的相关操作. 本篇主要讲树型列表的操作. 框架在设计时,已经把树型列表和普通列表全面统一了操作,用法几乎是一致的. 下面介绍一些差距化的内容: 1:树型列表绑定: v ...
- “四核”驱动的“三维”导航 -- 淘宝新UI（需求分析篇）
前言 孔子说:"软件是对客观世界的抽象". 首先声明,这里的"三维导航"和地图没一毛钱关系,"四核驱动"和硬件也没关系,而是为了复杂的应用而 ...
- 使用etree.HTML的编码问题
title: 使用etree.HTML的编码问题 date: 2015-10-07 17:56:47 categories: [Python] tags: [Python, lxml, Xpath] ...
- Android权限管理之Android 6.0运行时权限及解决办法
前言: 今天还是围绕着最近面试的一个热门话题Android 6.0权限适配来总结学习,其实Android 6.0权限适配我们公司是在今年5月份才开始做,算是比较晚的吧,不过现在Android 6.0以 ...
- 【转】39个让你受益的HTML5教程
闲话少说,本文作者为大家收集了网上学习HTML5的资源,期望它们可以帮助大家更好地学习HTML5. 好人啊! 不过,作者原来说的40个只有39个,因为第5个和第8个是重复的. 原文在此! 1. 五分钟 ...
- MySQL 系列（四）主从复制、备份恢复方案生产环境实战
第一篇:MySQL 系列(一) 生产标准线上环境安装配置案例及棘手问题解决 第二篇:MySQL 系列(二) 你不知道的数据库操作 第三篇:MySQL 系列(三)你不知道的 视图.触发器.存储过程.函数 ...
- 【读书】PHP程序员要读的书目(不断完善中)
本文地址 分享提纲: 1. PHP 2. Linux 3. Apache/Nginx 4. Mysql 5.设计模式/架构 6. 缓存并发 7. 其他语言 8. 代码基础 9. 大前端 10. 管理生 ...
- DB2重启数据库实例
DB2重启数据库实例时,有时停止实例会失败,此时需要先确认没有应用链接数据库,然后再关闭数据库实例,并重新启动. 1.查看是否有活动的链接 命令:db2 list applications for d ...
- UWP控件与DataBind
在uwp开发中必不可少的一个环节就是各种通用的控件的开发,所以在闲暇时间汇总了一下在uwp开发中控件的几种常用写法,以及属性的几种绑定方式,有可能不全面,请大家多多包涵 :) 1.先从win10新增的 ...