使用pandas计算列中的常用值

时间：2016-04-29 11:17:25

标签： python pandas

我有csv喜欢

PassengerId,Survived,Pclass,Name,Sex,Age,SibSp,Parch,Ticket,Fare,Cabin,Embarked
1,0,3,"Braund, Mr. Owen Harris",male,22,1,0,A/5 21171,7.25,,S
2,1,1,"Cumings, Mrs. John Bradley (Florence Briggs Thayer)",female,38,1,0,PC 17599,71.2833,C85,C
3,1,3,"Heikkinen, Miss. Laina",female,26,0,0,STON/O2. 3101282,7.925,,S
4,1,1,"Futrelle, Mrs. Jacques Heath (Lily May Peel)",female,35,1,0,113803,53.1,C123,S
5,0,3,"Allen, Mr. William Henry",male,35,0,0,373450,8.05,,S
6,0,3,"Moran, Mr. James",male,,0,0,330877,8.4583,,Q
7,0,1,"McCarthy, Mr. Timothy J",male,54,0,0,17463,51.8625,E46,S
8,0,3,"Palsson, Master. Gosta Leonard",male,2,3,1,349909,21.075,,S

我需要算上最受欢迎的男女名字。 我可以像

那样做 
for names in data['Name']:
    name = names.split(', ')
    print name[0]

但是，有没有办法只使用pandas？

1 个答案:

答案 0 :(得分：3)

我认为您可以首先使用split将名称解析为新的Series ser，然后使用Sex Ser将print data Name Sex Age SibSp \ 0 Braund, Mr. Owen Harris male 22.0 1 1 Futrelle, Mrs. John Bradley (Florence Briggs T... female 38.0 1 2 Heikkinen, Miss. Laina female 26.0 0 3 Futrelle, Mrs. Jacques Heath (Lily May Peel) female 35.0 1 4 Allen, Mr. William Henry male 35.0 0 5 Moran, Mr. James male NaN 0 6 McCarthy, Mr. Timothy J male 54.0 0 7 Braund, Master. Gosta Leonard male 2.0 3 Parch Ticket Fare Cabin Embarked 0 0 A/5 21171 7.2500 NaN S 1 0 PC 17599 71.2833 C85 C 2 0 STON/O2. 3101282 7.9250 NaN S 3 0 113803 53.1000 C123 S 4 0 373450 8.0500 NaN S 5 0 330877 8.4583 NaN Q 6 0 17463 51.8625 E46 S 7 1 349909 21.0750 NaN S 与ser = data['Name'].str.split(',').str[0] print ser 0 Braund 1 Futrelle 2 Heikkinen 3 Futrelle 4 Allen 5 Moran 6 McCarthy 7 Braund Name: Name, dtype: object print ser.groupby([data['Sex'], ser]).count() Sex Name female Futrelle 2 Heikkinen 1 male Allen 1 Braund 2 McCarthy 1 Moran 1 dtype: int64 print ser.groupby([data['Sex'], ser]).count().nlargest(4) Sex Name female Futrelle 2 male Braund 2 female Heikkinen 1 male Allen 1 dtype: int64 解析为all_names {3}}和groupby：

data['all_names'] =  data['Name'].str.split(',').str[0]
print data

                                                Name     Sex   Age  SibSp  \
0                            Braund, Mr. Owen Harris    male  22.0      1   
1  Futrelle, Mrs. John Bradley (Florence Briggs T...  female  38.0      1   
2                             Heikkinen, Miss. Laina  female  26.0      0   
3       Futrelle, Mrs. Jacques Heath (Lily May Peel)  female  35.0      1   
4                           Allen, Mr. William Henry    male  35.0      0   
5                                   Moran, Mr. James    male   NaN      0   
6                            McCarthy, Mr. Timothy J    male  54.0      0   
7                      Braund, Master. Gosta Leonard    male   2.0      3   

   Parch            Ticket     Fare Cabin Embarked  all_names  
0      0         A/5 21171   7.2500   NaN        S     Braund  
1      0          PC 17599  71.2833   C85        C   Futrelle  
2      0  STON/O2. 3101282   7.9250   NaN        S  Heikkinen  
3      0            113803  53.1000  C123        S   Futrelle  
4      0            373450   8.0500   NaN        S      Allen  
5      0            330877   8.4583   NaN        Q      Moran  
6      0             17463  51.8625   E46        S   McCarthy  
7      1            349909  21.0750   NaN        S     Braund  

print data.groupby(['Sex', 'all_names'])['all_names'].count()
Sex     all_names
female  Futrelle     2
        Heikkinen    1
male    Allen        1
        Braund       2
        McCarthy     1
        Moran        1
Name: all_names, dtype: int64

print data.groupby(['Sex', 'all_names'])['all_names'].count().nlargest(4)
Sex     all_names
female  Futrelle     2
male    Braund       2
female  Heikkinen    1
male    Allen        1
Name: all_names, dtype: int64

与使用辅助列super(int, String) super(int) super() // for completeness 相同：

AttributeError at /books/
type object 'Books' has no attribute 'Objects'
Request Method: GET
Request URL:    http://127.0.0.1:8000/books/
Django Version: 1.9
Exception Type: AttributeError
Exception Value:    
type object 'Books' has no attribute 'Objects'
Exception Location: F:\FYP\db2\testproject\books\views.py in index, line 7
Python Executable:  C:\Python27\python.exe
Python Version: 2.7.8
Python Path:    
['F:\\FYP\\db2\\testproject',
 'C:\\Python27\\lib\\site-packages\\setuptools-7.0-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\networkx-1.9.1-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\decorator-3.4.0-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\sys-1.0-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\requests-2.5.1-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\beautifulsoup-3.2.1-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\beautifulsoup4-4.3.2-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\nltk-3.0.1-py2.7-win32.egg',
 'C:\\Python27\\lib\\site-packages\\lxml-3.4.1-py2.7-win32.egg',
 'C:\\Python27\\lib\\site-packages\\stripogram-1.5-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\html2text-2014.12.29-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\dom-0.6-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\termcolor-1.1.0-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\simplejson-3.6.5-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\xmltodict-0.9.2-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\mysql-0.0.1-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\mysql_python-1.2.5-py2.7-win32.egg',
 'C:\\Python27\\lib\\site-packages\\textstat-0.1.6-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\utils-0.7-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\tweetpy-0.1-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\requests_oauthlib-0.5.0-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\oauthlib-0.7.2-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\tweepy-3.3.0-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\six-1.9.0-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\cython-0.22-py2.7-win32.egg',
 'C:\\Python27\\lib\\site-packages\\numpy-1.9.2-py2.7-win32.egg',
 'C:\\Python27\\lib\\site-packages\\pytz-2015.4-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\python_dateutil-2.4.2-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\pandas-0.16.1-py2.7-win32.egg',
 'C:\\Python27\\lib\\site-packages\\pip-7.0.3-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\matplotlib-1.4.3-py2.7-win32.egg',
 'C:\\Python27\\lib\\site-packages\\pyparsing-2.0.3-py2.7-win32.egg',
 'C:\\Python27\\lib\\site-packages\\html5lib-1.0b8-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\pelican-3.6.3-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\unidecode-0.04.19-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\blinker-1.4-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\docutils-0.12-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\pygments-2.1-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\jinja2-2.8-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\feedgenerator-1.7-py2.7.egg',
 'C:\\Python27\\lib\\site-packages\\markupsafe-0.23-py2.7-win32.egg',
 'C:\\Python27\\lib\\site-packages\\mechanize-0.2.5-py2.7.egg',
 'C:\\Windows\\SYSTEM32\\python27.zip',
 'C:\\Python27\\DLLs',
 'C:\\Python27\\lib',
 'C:\\Python27\\lib\\plat-win',
 'C:\\Python27\\lib\\lib-tk',
 'C:\\Python27',
 'C:\\Python27\\lib\\site-packages']
Server time:    Fri, 29 Apr 2016 11:26:32 +0000

from django.db import models

# Create your models here.

class Books(models.Model):
    title = models.CharField(max_length=150)
    author = models.CharField(max_length=100)
    read = models.CharField(max_length=3)

    def _unicode_(self):
        return self.title + "/"+ self.author+ "/" + self.read
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