Question

我想删除并替换一个名称超过6天的Excel文件。但是，当我根据[os.path.getctime(file_path)] [1]评估文件的使用期限时，getctime的值在删除并替换后不会改变。

我不确定使用getmtime还是getatime是否可行，因为我将在此期间修改文件。

    import os #check existing excel file stats
    import time #find creation date of file
    import openpyxl #excel module
    import sys #to collect sys args from command line

    def establish_wb():
        file_path = r'C:\Users\cj9250\Documents\this_weeks_blue_stakes.xlsx'

        if os.path.exists(file_path) == False: #if excel file does not exist
            wb = openpyxl.Workbook()
            wb.save(file_path)#create it

        current_time = time.time()
        creation_time = os.path.getctime(file_path) #when file was created
        file_age = (current_time - creation_time)/86400 #number of days since
        print(file_age)
        if file_age > 6: #if older than 6 days, replace the file
            os.remove(file_path)
            wb = openpyxl.Workbook()
            wb.save(file_path)#create file
            print('new one')
        else:#if younger than 6 days use existing one
            wb = openpyxl.load_workbook(file_path)
            print('old one')

        return wb



  [1]: https://docs.python.org/2/library/os.path.html

我最终通过将文档创建时间存储在随机单元格中对此进行了肮脏的修复。

import os #check existing excel file stats
import time #find creation date of file
import openpyxl #excel module
import sys #to collect sys args from command line

def establish_wb():
    file_name = 'this_weeks_blue_stakes.xlsx'
    file_path = 'C:\\Users\\cj9250\\Documents\\' + file_name

    if os.path.exists(file_path) == False: #if excel file does not exist
        wb = openpyxl.Workbook()
        wb.active['a49'] = time.time() #record creation time
        wb.save(file_path)#create it
        return wb #end function?
    else:#if it already exists, give wb a value for upcoming var assignments
        wb = openpyxl.load_workbook(file_path)
        print('a file existed')

    current_time = time.time()
    creation_time = wb.active['a49'].value #when file was created
    file_age = (current_time - creation_time)/86400 #number of days since creation
    print('this is the age ' + str(file_age))

    if file_age > .0005: #if older than 6 days, replace the file
        os.remove(file_path) #delete the file
        wb = openpyxl.Workbook()
        wb.active['a49'] = time.time()
        wb.save(file_path)#create file
        print('made a new new one')
    else:#if younger than 6 days use existing one
        wb = openpyxl.load_workbook(file_path)
        print('used the old one')

    return wb

Answer 1

由于os.path.getctime处理对inode的更改，这可能是由于inode的分配方式所致。

在大多数文件系统上，如果先删除文件然后再创建另一个文件，则通过删除前一个文件而释放的inode将分配给新文件（前提是在删除和新文件创建操作之间未创建新文件）。 / p>

touch temp.txt
stat -c%I temp.txt
970724

rm temp.txt

touch temp.txt
stat -c%I temp.txt
970724

rm temp.txt

touch temp1.txt
stat -c%I temp1.txt
970724
touch temp.txt
stat -c%I temp.txt
970727

当您执行os.path.getctime时，它将为您提供关于文件最后一次元数据更改的时间。 os.path.getmtime提供有关文件内容更改信息的信息，例如读和写。

注意：由于文件许可权的更改会更改元信息，因此并非始终都能始终获得确切的文件创建日期和时间。

删除和替换早于7天的文件

1 个答案: