Question

import sqlite3

def create_history(string1, r):
   db = sqlite3.connect(r)
   curr = db.cursor()

   db.execute('drop table if exists r')
   db.execute('create table r (symbol text, name text, datastartdate integer, \
   dataenddate integer)')
   for line in string1:
      value = line.strip().split(',')
      symbol = value[0]
      name = value[1]
      datastartdate = int(value[2])
      dataenddate = int(value[3])
      db.execute("insert into r values (?,?,?,?)", 
                 (symbol, name, datestartdate, dataenddate))
   db.commit()
   curr.close()
   db.close()

对于此代码，我不断收到错误。现在我得到了list index out of range。我试图使用SQLite创建一个数据库，但我并没有真正体验过它。

Traceback (most recent call last):
  File "C:\Program Files (x86)\Wing IDE 101 5.1\src\debug\tserver\_sandbox.py", line 1, in <module>
    # Used internally for debug sandbox under external interpreter
  File "C:\Program Files (x86)\Wing IDE 101 5.1\src\debug\tserver\_sandbox.py", line 13, in create_history
builtins.IndexError: list index out of range

文件中string1的数据是

AFU-UN,ACUITY FOCUSED TTL TRUST UNITS,20050216,20090831
BCD,DIAMONDCORE LTD,20080213,20091030
BMT,BMONT SPLIT CORP COM STK NPV,20060418,20090805
HUG,HORIZONS BETAPRO COMEX GOLD ET,20091029,20091030
NAE-UN,NAL OIL & GAS TST TRUST UNITS,19960813,20091030
NXY,NEXEN INC COM NPV,19950112,20091030
SCC,SEARS CANADA INC COM NPV,19950112,20091030
YNG,YUKON-NEVADA GOLD COM NPV,20050419,20091030

这是有关股票的信息，其值按以下顺序排列：

Symbol
Name
DataStartdate
DataEnddate

最终创建的文件总是填充一堆空值。这些也是用于处理函数的参数

create_history(open('sample_history'), 'history.db'))

空值是现在最大的问题。

Answer 1

如果string1是单个字符串中的整个文件，则for line in strings: …将迭代字符串中的每个字符。您需要先拆分新行：

for line in strings.split('\n'):
    …

但最好是在输入文件中输入迭代器，例如：

def create_history(input, …):
    …
    for line in input:
        # line has the trailing \n, so you need to strip() or something.
        …

create_history(open('file.csv'), …)

更好的是，使用Python的csv模块：

def create_history(input, …):
    …
    for row in csv.reader(input):
        symbol = row[0]
        …

python中的Sqlite问题：列表索引超出范围

1 个答案: