-1
例如，我想添加一個名爲DFA的新列，其中包含大量字符串值，如http://...URL鏈接。如何在Dataframe中添加多列字符串值的新列
基本上添加一個具有多個值的新列。
#!/usr/bin/python
import time
import os,sys
from os import path
import re
import sys, ast
import subprocess
import numpy as np
#from StringIO import StringIO
import pandas as pd
from IPython.display import HTML
pd.set_option('display.max_columns', 1000)
pd.set_option('display.max_colwidth',1000)
pd.set_option('display.width', 1000)
pd.set_option('display.notebook_repr_html', True)
location = "/root/madhu_test/bpstest/results/finalnss.txt"
f = pd.read_csv(location,delimiter='\t\t',skiprows=2)
cols = f.columns.tolist()
print cols
f = f.drop('BPS Profile.2', 1)
f = f.drop('BPS Profile.1', 1)
np.radians(f['Throughput'])
np.radians(f['Throughput.1'])
f.Throughput = f.Throughput.round()
f['Throughput.1'] = f['Throughput.1'].round()
f['percentage'] = ((f['Throughput.1']-f['Throughput'])/f['Throughput.1'])*100.0
f['percentage.1'] = ((f['Throughput.2']-f['Throughput'])/f['Throughput.2'])*100.0
f['Throughput.2'] = f['Throughput.2'].round()
f.percentage = f.percentage.round(1)
f['percentage.1'] = f['percentage.1'].round(1)
f['DFA'].loc = [['<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>','<a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>']]
給出輸出
DFA
0 SigTestHTTP21kBin 217 219 453 0.9 52.0 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
1 SigTestHTTP21kHtml 359 364 372 1.4 3.4 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
2 SigTestHTTP21kText 380 376 378 -1.1 -0.6 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
3 NSS-HTTP21Kdelay 378 380 378 0.5 0.0 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
4 NSS-HTTPCPS 18920 75 76 -25126.7 -24821.0 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
5 SIggTestPerimeter 270 223 232 -21.1 -16.2 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
6 SIgTestDatacenter 371 373 361 0.5 -2.7 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
7 NSS-Financial 5 56 57 91.1 91.2 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
8 NSS-Education 971 1010 958 3.9 -1.4 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
9 NSS-EuroMobile 921 933 942 1.3 2.2 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>]
10 NSS-USMobile 528 542 633 2.6 16.5 [<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>, <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt"
但我需要這樣的
DFA
0 SigTestHTTP21kBin 217 219 453 0.9 52.0 <a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>
1 SigTestHTTP21kHtml 359 364 372 1.4 3.4 <a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>
2 SigTestHTTP21kText 380 376 378 -1.1 -0.6
3 NSS-HTTP21Kdelay 378 380 378 0.5 0.0
4 NSS-HTTPCPS 18920 75 76 -25126.7 -24821.0
5 SIggTestPerimeter 270 223 232 -21.1 -16.2
6 SIgTestDatacenter 371 373 361 0.5 -2.7
7 NSS-Financial 5 56 57 91.1 91.2
8 NSS-Education 971 1010 958 3.9 -1.4
9 NSS-EuroMobile 921 933 942 1.3 2.2
10 NSS-USMobile 528 542 633 2.6 16.5
我試圖
f['DFA'].loc[0:2] = ['<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>','<a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>']
我碰到下面的錯誤輸出：
File "./some.py", line 50, in <module>
f['DFA'].loc[0:2] = ['<a href="http://10.209.81.36/Binary_dfa_NSS_sorted_2464.txt">Binary</a>','<a href="http://10.209.81.36/HTML_dfa_NSS_sorted_2464.txt">Html</a>']
File "/usr/local/lib/python2.7/site-packages/pandas-0.15.2-py2.7-linux-i686.egg/pandas/core/frame.py", line 1780, in __getitem__
return self._getitem_column(key)
File "/usr/local/lib/python2.7/site-packages/pandas-0.15.2-py2.7-linux-i686.egg/pandas/core/frame.py", line 1787, in _getitem_column
return self._get_item_cache(key)
File "/usr/local/lib/python2.7/site-packages/pandas-0.15.2-py2.7-linux-i686.egg/pandas/core/generic.py", line 1068, in _get_item_cache
values = self._data.get(item)
File "/usr/local/lib/python2.7/site-packages/pandas-0.15.2-py2.7-linux-i686.egg/pandas/core/internals.py", line 2849, in get
loc = self.items.get_loc(item)
File "/usr/local/lib/python2.7/site-packages/pandas-0.15.2-py2.7-linux-i686.egg/pandas/core/index.py", line 1402, in get_loc
return self._engine.get_loc(_values_from_object(key))
File "pandas/index.pyx", line 134, in pandas.index.IndexEngine.get_loc (pandas/index.c:3812)
File "pandas/index.pyx", line 154, in pandas.index.IndexEngine.get_loc (pandas/index.c:3692)
File "pandas/hashtable.pyx", line 696, in pandas.hashtable.PyObjectHashTable.get_item (pandas/hashtable.c:12299)
File "pandas/hashtable.pyx", line 704, in pandas.hashtable.PyObjectHashTable.get_item (pandas/hashtable.c:12250)
對不起，你的新值是一個字符串還是一個列表？ – EdChum
其URL列表 – bhasinusc
所以你想要設置所有的行到URL？它是一個棘手的列表，因爲它是一個迭代它期望元素的長度匹配，所以下面的工作：'f ['DFA'] = [[''Binary'，'Html']] * len（f）'this創建一個列表，它重複了df的長度 – EdChum