2013年8月12日Python的5个最有价值问题

答:

假设3都在值里,而非键
>>> for v in D1.values():
...     if 3 in v:
...         v.remove(3)
...
>>> D1
{'A1': [2], 'C1': [4, 5], 'B1': [3]}

这个代码还能适用于更多情况,比如:
>>> D1 = {'A1' : [2, 3], 'B1': [3, 3], 'C1' : [4, 5]}
>>> for k, v in D1.items():
...     D1[k] = filter(lambda x: x!=3, v)
...
>>> D1
{'A1': [2], 'C1': [4, 5], 'B1': []}

问:Python的TKinter框架怎么创建实体表

答:

from Tkinter import *
from string import ascii_lowercase
  
class app(Frame):
    def __init__(self, master = None):
        Frame.__init__(self, master)
        self.grid()
        self.create_widgets()
  
    def create_widgets(self):
        self.entries = {}
        self.tableheight = 9
        self.tablewidth = 9
        counter = 0
        for row in xrange(self.tableheight):
            for column in xrange(self.tablewidth):
                self.entries[counter] = Entry(self, width=5)
                self.entries[counter].grid(row=row, column=column)
                counter += 1
  
prog = app()
prog.master.title('Sudoku')
prog.mainloop()
 
问:Python怎么转换Dictionary为DataFrame?
答:
import json
import pandas as pd
  
db = json.loads(open('pruItems.json', 'r').read())
pieces = []
for d in db:
    if d['data']:
        df = pd.DataFrame(d['data'])
        df.columns = ['date', 'bid', 'ask']
        df = df.set_index('date')
        pieces.append(df)
  
df = pd.concat(pieces, axis=1, keys=[d['fund'] for d in db])
  
print df
输出:
                TGC               FEF              FAF        
                bid      ask      bid      ask     bid     ask
date                                                          
18/06/2013  34.8400  34.8400  14.9179  14.9179  6.6780  6.6780
17/06/2013  34.4900  34.4900  14.8712  14.8712  6.6510  6.6570
 
问:Python怎么使用BeautifulSoup来提取两个Html标签之间的内容
答:
使用.content
>>> from bs4 import BeautifulSoup as BS
>>> html = """<li class="li_dataline2">
... 
... 
... <b> Expiry date: </b>14/09/2013
... 
... 
... </li>"""
>>> soup = BS(html)
>>> print soup.find('li', {'class':'li_dataline2'}).contents[-1].strip()
14/09/2013

2013年8月12日Python的5个最有价值问题

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