Question

使用with open创建csv文件时，在新路径中使用变量时遇到问题。我可以使用.csv文件名创建dirpath，并使用os.path.join添加它们。但是当我尝试在open语句中使用整个格式正确的路径时，它会在字符串中当前反斜杠旁边添加一个额外的反斜杠？找不到任何关于为什么会这样做的文件。

这是错误

FileNotFoundError: [Errno 2] No such file or directory: 'Logs\\14-05-2018\\dfg.csv'

如果我只是编写以下内容，我可以创建子文件夹和csvs没问题。

with open(Logs\1234\asd.csv) 'w') as csvfile:

所以这就是我在第43行收到的错误，这是with open(csvlogPath, 'w') as csvfile:我尝试使用r而不是＆＃39; w＆＃39;同样的问题。两天后不知所措，问你们。：）

import csv, os.path

#Get and create csv filename string
logFN = input("Please name your trade.\n#")            
suffix = '.csv'
csvname = logFN + suffix
#Create dir name string
t = time.strftime("%d-%m-%Y-%H%M")
dirsname = os.path.join('Logs', t)

csvlogPath = os.path.join(dirsname,csvname)

with open(csvlogPath, 'w') as csvfile:
    filewriter = csv.writer(csvfile, delimiter=',', lineterminator='\n', quotechar='|', quoting=csv.QUOTE_MINIMAL)

    filewriter.writerow(['get', 'new', 'values', 'later'])

with open(csvlogPath, 'w') as f:
    reader = csv.reader(f)
 # read file row by row
    rwsCount = 0    
    for row in reader:        
        print (row, rwsCount)
        rwsCount += 1

line_number = rwsCount-1
print (line_number)

with open(csvlogPath, 'w') as f:
    mycsv = csv.reader(f)
    mycsv = list(mycsv)
    text = mycsv[line_number][0]

print (text)

Answer 1

你需要在python中制作dirs，你可以使用os.makedirs(path)，如下所示：

csvlogPath = os.path.join(dirsname,csvname)
os.makedirs(os.path.dirname(csvlogPath), exist_ok=True)
with open(csvlogPath, 'w') as csvfile:
    filewriter = csv.writer(csvfile, delimiter=',', lineterminator='\n', quotechar='|', quoting=csv.QUOTE_MINIMAL)

    filewriter.writerow(['get', 'new', 'values', 'later'])

打开时，使用'r'读取和'w'写入，因此您需要将下一个更改为打开：

with open(csvlogPath, 'r') as f:
    reader = csv.reader(f)
 # read file row by row
    rwsCount = 0    
    for row in reader:        
        print (row, rwsCount)
        rwsCount += 1

line_number = rwsCount-1
print (line_number)

with open(csvlogPath, 'r') as f:
    mycsv = csv.reader(f)
    mycsv = list(mycsv)
    text = mycsv[line_number][0]

Answer 2

测试此代码：

import csv, os.path

#Get and create csv filename string
import time

logFN = input("Please name your trade.\n#")
suffix = '.csv'
csvname = logFN + suffix
#Create dir name string
t = time.strftime("%d-%m-%Y-%H%M")
dirsname = os.path.join('Logs', t)

###########################
if not os.path.exists(dirsname):
    os.makedirs(dirsname)
###########################


csvlogPath = os.path.join(dirsname,csvname)

with open(csvlogPath, 'w') as csvfile:
    filewriter = csv.writer(csvfile, delimiter=',', lineterminator='\n', quotechar='|', quoting=csv.QUOTE_MINIMAL)

    filewriter.writerow(['get', 'new', 'values', 'later'])

with open(csvlogPath, 'r') as f:
    reader = csv.reader(f)
 # read file row by row
    rwsCount = 0
    for row in reader:
        print (row, rwsCount)
        rwsCount += 1

line_number = rwsCount-1
print (line_number)

with open(csvlogPath, 'r') as f:
    mycsv = csv.reader(f)
    mycsv = list(mycsv)
    text = mycsv[line_number][0]

print (text)

在新的子目录python 3.6

2 个答案: