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我在创建动态表以适应各种结果时遇到问题。

我写了一个屏幕刮板来从http://finance.yahoo.com提取股票并打印公司名称、符号和当前股价。

但是输出看起来像这样：

 Microsoft Corporation MSFT 29.76

 Apple Inc. AAPL 396.77

 SPDR S&P 500 SPY 155.25

 Google Inc. GOOG 787.76

我希望它看起来像

Microsoft Corporation        MSFT      29.76

Apple Inc.                   AAPL      396.77

SPDR S&P 500                 SPY       155.25

Google Inc.                  GOOG      787.76

我昨天刚开始使用 Python 并且正在使用 3.3.1

我目前的代码如下：

import re
import urllib.request
import cgi
from bs4 import BeautifulSoup

price = [0,0,0,0]
namesList = ["string1", "string2", "string3", "string4"]
stocksList = ["msft","aapl","spy","goog"]

def HTML():
    i = 0
    while i < len(stocksList):
        htmlPull = urllib.request.urlopen("http://finance.yahoo.com/q?s="+stocksList[i]+"&ql=1")
        htmlPull = htmlPull.read().decode('utf-8')
        regex = '<span id="yfs_l84_'+stocksList[i]+'">(.+?)</span>'
        pattern = re.compile(regex)
        price[i] = re.findall(pattern,htmlPull)
        htmlParse = BeautifulSoup(htmlPull)
        title = htmlParse.title.contents
        namesList[i] = title        
        i+=1

formatPrice(price)
formatStock(namesList)
formatOutput(namesList, stocksList, price)

def formatPrice(price):
    k=0
    while k < len(price):
        cleaner = str(price[k])
        cleaner = cleaner.replace("[","")
        cleaner = cleaner.replace("]","")
        cleaner = cleaner.replace("'","")
        price[k] = float(cleaner)
        k+=1

def formatStock(namesList):
    k = 0
    while k <len(namesList):
        capital = stocksList[k]
        capital = capital.upper()
        cleaner = str(namesList[k])
        cleaner = cleaner.replace("Summary for ", "")
        cleaner = cleaner.replace(":"," ")
        cleaner = cleaner.replace("- Yahoo! Finance'","")
        cleaner = cleaner.replace("['","")
        cleaner = cleaner.replace("]","")
        cleaner = cleaner.replace(";","")
        cleaner = cleaner.replace(capital, "")
        namesList[k] = cleaner;
        k+=1

    def formatOutput(namesList, stocksList, price):
        i = 0
        while i < len(price):
        capital = stocksList[i]
        capital = capital.upper()
        print(namesList[i],capital, price[i])
        print("")
        i+=1
HTML()

尝试过 print ({0},{1},{2}.format (namesList, capital, price[i]))，各种类型的 {:<16} 变体等。它似乎只影响一行，我'试图让它根据列、表格或文本和空白应该填充的一定空间来思考。我不确定这里的解决方案到底是什么，所以我问大家:)

从我的代码可以看出，我对编程很陌生，所以如果在这段代码中有更好的方法来做任何事情，我很乐意听取更正、建议和建议。

4

1 回答 1

1

You want to set the width based on the longest item in the column.

In Python, you use max to find the largest of some group of things. So, outside the loop, you can do:

names_width = max(len(name) for name in namesList)
stock_width = max(len(stock) for stock in stockList)

Then, format each line like you said you tried:

print({0:{3}}  {1:{4}}  {2}.format(namesList[i],
                                   capital,
                                   price[i],
                                   names_width,
                                   stock_width))
于 2013-04-19T17:55:53.997 回答