如何让python从csv文件中删除我搜索的行_Python_Csv

如何让python从csv文件中删除我搜索的行

python csv

如何让python从csv文件中删除我搜索的行,python,csv,Python,Csv,我可以编辑和添加新条目，但每次我尝试删除我搜索的行时，它都会擦除整个文件数据我需要它在不丢失其余行的情况下删除该行数据。 import csv,os,sys def helper(file): o=csv.reader(open(file,"r")) for row in o: print row def delete(filename): found=False f1=csv.reader(open(filename,'r'))

我可以编辑和添加新条目，但每次我尝试删除我搜索的行时，它都会擦除整个文件数据

我需要它在不丢失其余行的情况下删除该行数据。

    import csv,os,sys

def helper(file):
    o=csv.reader(open(file,"r"))
    for row in o:
        print row

def delete(filename):
    found=False
    f1=csv.reader(open(filename,'r'))
    f2=csv.writer(open("temp.csv",'a'))
    rid=raw_input("Enter name to find record:")
    for row in f1:
        if rid in row[0]:
            found=True
            f2.writerow()
            print rid, "has been deleted from the database!"
        else:
            found=False
    if found==False:
        print "That name isn't in our database!"
        z=raw_input("Please enter 1 to retry, 2 to return to log in, or 3 to close program:")
        if z=="1":
            delete(filename)
        if z=="2":
            import program
        if z=="3":
            exit




helping=raw_input("Do you require any help with using this feature?Type y for yes or just hit enter to continue:")
if helping=="y":
    helper('deletehelp.txt')

delete("custdet.csv")       
os.remove("custdet.csv")
os.rename("temp.csv","custdet.csv")     #This is the file rename that I mentioned above.
restart=raw_input("Would you like to return to the main menu? Please type Y or just hit enter to exit:")
if restart=="y":
    import program
else: exit

您从未实际写入新的csv文件

查看主筛选/复制循环：

# for every row in the input file
for row in f1:
        # Is this the/a record to delete?
        if rid in row[0]:
            # yes!
            found=True
            # then we do not write anything to the output file (???)
            f2.writerow()
            print rid, "has been deleted from the database!"
        # no else part, so no nothing gets done with
        # the input row `row` ...

因此，您将得到一个空的输出文件…

您从未真正写入新的csv文件

import csv,os,sys

def helper(file):
    o = csv.reader(open(file,"r"))
    for row in o:
        print row

def delete(filename):
    f1 = csv.reader(open(filename,'r'))
    f2 = csv.writer(open("temp.csv",'a'))
    rid = raw_input("Enter name to find record:")
    found = False
    for row in f1:
        if rid not in row[0]:
            f2.writerow(row)
        else:
            found = True
            print rid, "has been deleted from the database!"

    if found == False:
        print "That name isn't in our database!"
        z = raw_input("Please enter 1 to retry, 2 to return to log in, or 3 to close program:")
        if z == "1":
            delete(filename)
        if z == "2":
            import program
        if z == "3":
            exit

查看主筛选/复制循环：

# for every row in the input file
for row in f1:
        # Is this the/a record to delete?
        if rid in row[0]:
            # yes!
            found=True
            # then we do not write anything to the output file (???)
            f2.writerow()
            print rid, "has been deleted from the database!"
        # no else part, so no nothing gets done with
        # the input row `row` ...

因此，您将得到一个空的输出文件…

将包含for循环的部分更改为：

import csv,os,sys

def helper(file):
    o = csv.reader(open(file,"r"))
    for row in o:
        print row

def delete(filename):
    f1 = csv.reader(open(filename,'r'))
    f2 = csv.writer(open("temp.csv",'a'))
    rid = raw_input("Enter name to find record:")
    found = False
    for row in f1:
        if rid not in row[0]:
            f2.writerow(row)
        else:
            found = True
            print rid, "has been deleted from the database!"

    if found == False:
        print "That name isn't in our database!"
        z = raw_input("Please enter 1 to retry, 2 to return to log in, or 3 to close program:")
        if z == "1":
            delete(filename)
        if z == "2":
            import program
        if z == "3":
            exit

    for row in f1:
        if rid in row[0]:
            found=True
            print rid, "has been deleted from the database!"
        else:
            f2.writerow(row)

这些变化：

如果
```
rid
```
不在
```
行[0]
```
不要将
```
found
```
标志重置为
```
False
```

代码的其余部分也需要一些工作：

递归不是处理重试的最佳方法，请改用循环
```
导入程序
```
返回登录？？？？？那是不可能的工作也许您应该从函数返回
```
delete（）
```
和调用它的代码之间存在耦合依赖于正在创建的名为
```
temp.csv
```
的文件。那就太多了如果
```
delete（）
```
执行了临时文件本身的重命名，效果会更好

将包含for循环的部分更改为：

    for row in f1:
        if rid in row[0]:
            found=True
            print rid, "has been deleted from the database!"
        else:
            f2.writerow(row)

这些变化：

如果
```
rid
```
不在
```
行[0]
```
不要将
```
found
```
标志重置为
```
False
```

代码的其余部分也需要一些工作：

递归不是处理重试的最佳方法，请改用循环
```
导入程序
```
返回登录？？？？？那是不可能的工作也许您应该从函数返回
```
delete（）
```
和调用它的代码之间存在耦合依赖于正在创建的名为
```
temp.csv
```
的文件。那就太多了如果
```
delete（）
```
执行了临时文件本身的重命名，效果会更好

也许你的f2.writerow（）应该在if语句之外！！！是的，它也是空的。你能告诉我你的意思吗？如果你想删除用户输入的行，你肯定不想将它写入你的新文件！所以它应该在if块之外。也许你的f2.writerow（）应该在if语句之外！！！是的，它也是空的。你能告诉我你的意思吗？如果你想删除用户输入的行，你肯定不想将它写入你的新文件！所以它应该在if块之外。