大约有 47,000 项符合查询结果（耗时：0.0382秒） [XML]
Convert xlsx to csv in Linux with command line
I'm looking for a way to convert xlsx files to csv files on Linux.
10 Answers
10
...
Create a .txt file if doesn't exist, and if it does append a new line
I would like to create a .txt file and write to it, and if the file already exists I just want to append some more lines:
1...
How to make clang compile to llvm IR
...
Given some C/C++ file foo.c:
> clang -S -emit-llvm foo.c
Produces foo.ll which is an LLVM IR file.
The -emit-llvm option can also be passed to the compiler front-end directly, and not the driver by means of -cc1:
> clang -cc1 foo.c...
What is __init__.py for?
... package is typically implemented as a directory containing an __init__.py file. When a regular package is imported, this __init__.py file is implicitly executed, and the objects it defines are bound to names in the package’s namespace. The __init__.py file can contain the same Python code that an...
Why do we need the “finally” clause in Python?
...
You can use finally to make sure files or resources are closed or released regardless of whether an exception occurs, even if you don't catch the exception. (Or if you don't catch that specific exception.)
myfile = open("test.txt", "w")
try:
myfile.wri...
How to skip “are you sure Y/N” when deleting files in batch files
...member how to bypass the annoying prompt are you sure? Y/N when deleting files.
4 Answers
...
How can I make one python file run another? [duplicate]
How can I make one python file to run another?
8 Answers
8
...
RAII and smart pointers in C++
...
A simple (and perhaps overused) example of RAII is a File class. Without RAII, the code might look something like this:
File file("/path/to/file");
// Do stuff with file
file.close();
In other words, we must make sure that we close the file once we've finished with it. This ...
How do I send a file as an email attachment using Linux command line?
...server that uses mysqldump to back up each of my MySQL databases to .sql files and packages them together as a compressed .tar file. The next step I want to accomplish is to send that tar file through email to a remote email server for safekeeping. I've been able to send the raw script in the bo...
How to divide flask app into multiple py files?
My flask application currently consists of a single test.py file with multiple routes and the main() route defined. Is there some way I could create a test2.py file that contains routes that were not handled in test.py ?
...