pandas merge series

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Python data table merge (Python pandas join (), merge (), and concat () usage)

merage#Pandas provides a method Merge (left, right, how= ' inner ', On=none, Left_on=none, Right_on=none, left_index=false, Right_index=false, sort= True, suffixes= (' _x ', ' _y '), Copy=true, Indicator=false)As a fully functional and powerful language, the merge () in Python's pandas library supports a vari

Pandas Array (Pandas Series)-(4) Processing of Nan

The previous Pandas array (Pandas Series)-(3) Vectorization, said that when the two Pandas series were vectorized, if a key index was only in one of the series , the result of the calculation is nan , so what is the way to deal wi

Pandas Array (Pandas Series)-(5) Apply method Custom function

Sometimes you need to do some work on the values in the Pandas series , but without the built-in functions, you can write a function yourself, using the Pandas series 's apply method, You can call this function on each value inside, and then return a new SeriesImport= PD. Series

Pandas Array (Pandas Series)-(3) Vectorization operations

This article describes how the pandas series with the index index is vectorized:1. Index indexed arrays are the same:S1 = PD. Series ([1, 2, 3, 4], index=['a','b','C','D']) S2= PD. Series ([ten, +, +], index=['a','b','C','D'])PrintS1 +s2a11b22C33D44Dtype:int64Add the values corresponding to each index directly2. Index

Pandas Array (Pandas Series)-(2)

The pandas Series is much more powerful than the numpy array , in many waysFirst, the pandas Series has some methods, such as:The describe method can give some analysis data of Series :Import= PD. Series ([1,2,3,4]) d = s.describ

Pandas Array (Pandas Series)-(1)

Import Pandasimport Pandas as PDCountries = ['Albania','Algeria','Andorra','Angola','Antigua and Barbuda', 'Argentina','Armenia','Australia','Austria','Azerbaijan', 'Bahamas','Bahrain','Bangladesh','Barbados','Belarus', 'Belgium','Belize','Benin','Bhutan','Bolivia']life_expectancy_values= [74.7, 75., 83.4, 57.6, 74.6, 75.4, 72.3, 81.5, 80.2, 70.3, 72.1, 76.4, 68.1, 75.2, 69.8, 79.4, 70.8, 62

Pandas data merging and remodeling (Concat join/merge)

1 concat The Concat function is a method underneath the pandas that allows for a simple fusion of data based on different axes. Pd.concat (Objs, axis=0, join= ' outer ', Join_axes=none, Ignore_index=false, Keys=none, Levels=none, Names=None, Verify_integrity=false)1 2 1 2 1 2 Parameter descriptionObjs:series,dataframe or a sequence of panel compositions lsitAxis: Axis that needs to merge links, 0

Pandas Merging multiple dataframe (MERGE,CONCAT)

At the time of data processing, especially in the big data contest, often encounter a problem is that multiple forms of merging problems, such as a form has user_id and age two fields, another form has user_id and sex two fields, to merge these two tables into only user_id, Age, sex three fields of the table what to do, the ordinary stitching is not possible, because user_id each row is not the corresponding, like the building blocks of horizontal sti

Getting Started with Python 5 (parameters in merge in Pandas how)

1 ImportPandas as PD2DF1 = PD. DataFrame ([[1,2,3],[5,6,7],[3,9,0],[8,0,3]],columns=['X1','X2','X3'])3DF2 = PD. DataFrame ([[1,2],[4,6],[3,9]],columns=['X1','X4'])4 Print(DF1)5 Print(DF2)6DF3 = Pd.merge (df1,df2,how =' Left', on='X1')7 Print(DF3)8DF4 = Pd.merge (df1,df2,how =' Right', on='X1')9 Print(DF4)TenDf5 = Pd.merge (df1,df2,how ='Inner', on='X1') One Print(DF5) ADf6 = Pd.merge (df1,df2,how ='outer', on='X1') - Print(DF6)Getting Started with Python 5 (parameters in

Small meatballs stepping into Python's path: python_day06 (another structure series in the Pandas Library)

write in front: by yesterday's record we know, pandas.read_csv (" file name ") method to read the file, the variable type returned is dataframe structure . Also pandas one of the most core types in . That in pandas there is no other type Ah, of course there are, we put dataframe type is understood to be data consisting of rows and columns, then dataframe is decomposed to take one or more of the rows

Using Python for data analysis (7)-pandas (Series and DataFrame), pandasdataframe

Using Python for data analysis (7)-pandas (Series and DataFrame), pandasdataframe 1. What is pandas? Pandas is a Python data analysis package based on NumPy for data analysis. It provides a large number of advanced data structures and data processing methods. Pandas has two

Pandas time Series data plotting x-axis major and minor ticks

Let's go first (Tue in Figure Tuesday):Both Pandas and matplotlib.dates use matplotlib.units to position the scale.Matplotlib.dates can easily set the scale manually, while pandas seems to automatically adjust the format.Directly on the code bar:#-*-coding:utf-8-*-"""Created on Tue Dec 10:43:01 2015@author:vgis"""ImportNumPy as NPImportPandas as PDImportMatplotlib.pyplot as PltImportMatplotlib.dates as Date

Python captures financial data, pandas performs data analysis and visualization series (to understand the needs), pythonpandas

Python captures financial data, pandas performs data analysis and visualization series (to understand the needs), pythonpandasFinally, I hope that it is not the preface of the preface. It is equivalent to chatting and chatting. I think a lot of things are coming from the discussion. For example, if you need something, you can only communicate with yourself, only by summing up some things can we better chat

Pandas:2, time series processing _ceilometer

#!/usr/bin/env python #-*-coding:utf-8-*-# @Time: 4/14/18 4:16 PM # @Author: Aries # @Site: # @File: t imeseries_demo.py # @Software: Pycharm ' Pandas time Series reference: https://blog.csdn.net/ly_ysys629/article/details/73822716 https://blog.csdn.net/pipisorry/article/details/52209377 official document:http://pandas.pydata.org/pandas-docs/ stable/http://pandas

Python Pandas time Series double axis line chart

Time series PV-GMV Double axis line chartImport NumPy as Npimport pandas as Pdimport matplotlib.pyplot as Pltn = 12date_series = Pd.date_range (start= ' 2018-01-01 ', Periods=n, freq= "D") data = { ' PV ': [10000, 12000, 13000, 11000, 9000, 16000, 10000, 12000, 13000, 11000, 9000, 16000], ' GMV ': [+-------------- DataFrame (data, index=date_series) ax = df.plot ( secondary_y=[' GMV '), x_compat

Pandas series DataFrame row and column data filtering, pandasdataframe

Pandas series DataFrame row and column data filtering, pandasdataframe I. Cognition of DataFrame DataFrame is essentially a row (index) column index + multiple columns of data. To simplify our understanding, let's change our thinking... In reality, to simplify the description of a thing, We will select several features.For example, to portray a person from the perspectives of gender, height, education, occ

Pandas time series Resample

The difference between resample and GroupBy:Resample: Resampling within a given time unitGroupBy: Statistics on a given data entryFunction Prototypes:Dataframe.resample (rule, How=none, axis=0, Fill_method=none, Closed=none, Label=none, convention= ' start ', Kind=None, Loffset=none, Limit=none, base=0)Where the parameters are deprecated.Let's start practicing.Import NumPy as NP import Pandas as PDStart by creating a

Pandas Time Series Sliding window

Time series data Statistics-sliding window window functionsimport pandas as pdimport numpy as npser_obj = pd.Series(np.random.randn(1000), index=pd.date_range('20180101', periods=1000))ser_obj = ser_obj.cumsum()print(ser_obj.head())2018-01-01 0.7973342018-01-02 0.4512862018-01-03 1.3291332018-01-04 0.4165772018-01-05 0.610993Freq: D, dtype: float64r_obj = ser_obj.rolling(w

Pandas Learning: Sorting series and Dataframe __pandas

This question mainly writes the method of sorting series and dataframe according to index or value Code: #coding =utf-8 Import pandas as PD import numpy as NP #以下实现排序功能. SERIES=PD. Series ([3,4,1,6],index=[' B ', ' A ', ' d ', ' C ']) FRAME=PD. Dataframe ([[2,4,1,5],[3,1,4,5],[5,1,4,2]],columns=[' B ', ' A ', ' d ', '

PHP sort algorithm series merge sort details, sort algorithm merge details

PHP sort algorithm series merge sort details, sort algorithm merge details Merge Sorting MERGE-SORT is an effective Sorting Algorithm Based on MERGE operations. It is a typical application of Divide and Conquer. Merges ordered sub

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