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[英]Reading a CSV file and converting data into python lists. ValueError: could not convert string to float:
[英]Reading csv file to python ValueError: could not convert string to float
任何幫助都將不勝感激。 請記住,我是Python的初學者。 這是我遇到問題的代碼部分:
__author__ = 'peter'
from datetime import datetime, timedelta
import csv
TICKER='CHTR'
STDEV_FILE = TICKER + '_stdev.csv'
TRADES_FILE = TICKER + '_trades.csv'
DATETIME_CSV_FORMAT = '%Y%m%d %H:%M:%S'
def read_data(csv_filename):
result = {}
with open(csv_filename, 'rb') as csvfile:
reader = csv.reader(csvfile, delimiter=',', quotechar='|')
header = reader.next()
#print 'HEADER',header
for row in reader:
new_data=None
if len(row)==6: # this is a QUOTES file
ticker, date, time, price, rtn, standard = row
rtn = float(rtn)
standard = float(standard)
new_data = [rtn, standard]
else: # assume this is a TRADES file otherwise
ticker, date, time, price, size = row
price = float(price)
size = int(size)
new_data = [price, size]
date_object = datetime.strptime(date +' '+time, DATETIME_CSV_FORMAT)
if not ticker in result:
result[ticker]=[]
result[ticker].append([date_object] + new_data)
return result
vol = read_data(STDEV_FILE)
trades = read_data(TRADES_FILE
)
當我運行它時,這是我收到的錯誤:
Traceback (most recent call last):
File "/home/peter/PycharmProjects/Vol/Vol.py", line 39, in <module>
vol = read_data(STDEV_FILE)
File "/home/peter/PycharmProjects/Vol/Vol.py", line 25, in read_data
standard = float(standard)
ValueError: could not convert string to float: #DIV/0!
我在其他csv文件上運行此操作並沒有遇到任何問題。
以下是csv文件的一小部分示例:
SYMBOL DATE TIME PRICE RTN STDEV
-----------------------------------------------------------------------
CHTR 20130718 9:30:00 124.66 0 0
-----------------------------------------------------------------------
CHTR 20130718 9:30:00 124.66 0 0.0005674559
-----------------------------------------------------------------------
CHTR 20130718 9:30:00 124.56 -0.0008025039 0.0004539101
-----------------------------------------------------------------------
CHTR 20130718 9:30:00 124.54 -0.0001605781 0.0001135459
-----------------------------------------------------------------------
CHTR 20130718 9:30:00 124.54 0 0.0070177722
-----------------------------------------------------------------------
CHTR 20130718 9:31:56 123.310 -0.0099246286 0.011065531
-----------------------------------------------------------------------
CHTR 20130718 9:34:05 124.018 0.0057243955 0.0040363557
-----------------------------------------------------------------------
最后,我想繪制y軸上的標准偏差和x軸上午夜的秒數。 任何幫助,將不勝感激。
問題是你正在嘗試將字符串“#DIV / 0”轉換為浮點數。顯然這是不可能的。原因是你試圖在excel / csv表單中的某處除以零。回顧你的excel表單並查看是否有任何內容除以零並更改它。
或者你可以實現一個簡單的if語句:
if standard == '#DIV/0':
print 'Error'
else:
standard = float(standard)
編輯:一些參考: http : //office.microsoft.com/en-us/excel-help/correct-a-div-0-error-HP010066245.aspx
而不是“if standard =='#DIV / 0':”,它可能更容易,更易讀:
if standard.isdigit():
standard = float(standard)
else:
# error code
str.isdigit()將檢查'str'中的所有字符,看它們是否為數字。
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