Python 日期错误

Question

这是我的日志文件的几行

10/21/2015 10:16:42 AM Following hmac:c35330404902c0b1bb5c6d0718407ea12b25a464433bd1e69152ccc0e0b89c9f  with is already in database so dropping
11/21/2015 10:16:42 AM The data for the duplicate Hmac is : HF 13300100012015-06-15 19:30:21+0000+ 12.61 0.010  1686.00
07/21/2015 10:16:42 AM Following hmac:84d9cdb2145b7c3e0fa2d099070b7bd291c652f30ca25c69240e33ebbd2b8677  with is already in database so dropping
07/21/2016 10:16:42 AM The data for the duplicate Hmac is : HF 13300100012015-06-15 20:16:18+0000+ 12.60 0.045  1686.00
07/20/2016 10:16:42 AM Following hmac:a24d19d340651e694bff854ae7469dd779b60037228bf047d8f372dee4a731e0  with is already in database so dropping
07/20/2016 10:16:42 AM The data for the duplicate Hmac is : HF 13300100012015-06-15 20:31:25+0000+ 12.62 0.045  1685.00
07/20/2016 10:16:42 AM Following hmac:4e239a4b69108833e9cbc987db2014f9137679860df0ca8efdf7d09c4897d369  with is already in database so dropping
07/19/2016 10:16:42 AM The data for the duplicate Hmac is : HF 13300100012015-06-15 20:46:27+0000+ 12.61 0.040  1685.00

我的目标是遍历行和 return 行计数特定字符，包括 hmac。我已经计算了总计数，但我想 return 过去一年的行数。尝试提取每一行的日期部分给我一个错误

ValueError：未转换的数据仍然存在：

我试过但找不到解决方案。这是我的代码从日期时间导入日期从日期时间导入时间从日期时间导入日期时间从日期时间导入时间增量导入 os

def fileCount(fileName):

    with open(fileName) as FileObj:

        Count = 0
        todayDate = date.today()
        OneYear = str(todayDate -  timedelta(days=365))
        OneMonth = str(todayDate -  timedelta(days=30))
        ThreeMonths = str(todayDate -  timedelta(days=90))

        while True:

            line = FileObj.readline()

            Lines = "-".join(line[:11].split("/"))

            convertDate = datetime.strptime(Lines, '%m-%d-%Y')

            print convertDate

            if not line:
                break
            if "Following hmac" in line:

                Count += 1

        print "The total count is ", Count

# Call The function
def main():

    filePath = 'file.txt'

    fileCount(filePath)

if __name__ == "__main__":

    main()

我想提取日期以将其用于日期算术运算，这样我就可以 return 计算过去三个月、六个月和 12 个月的数据。

Answer 1

您的切片的停止索引包括尾随 space，您提供的日期格式中未考虑该索引。

你应该去掉 space:

>>> datetime.strptime(Lines.rstrip(), '%m-%d-%Y')
datetime.datetime(2015, 10, 21, 0, 0)

或将索引更改为 10 而不是 11 以完全排除 space：

Lines = "-".join(line[:10].split("/"))

考虑格式中的额外 space 也是另一个修复方法：

convertDate = datetime.strptime(Lines, '%m-%d-%Y ')

您可以使用 try/except:

处理其他错误，例如空白行或没有日期字符串的行

lines = "-".join(line[:10].split("/"))
try:
    convert_date = datetime.strptime(lines, '%m-%d-%Y')
    print convert_date
except ValueError:
    print 'This line has a problem:', lines

Python 日期错误

Python Date Error

python

python-2.6

ipython

python-2.7