Windows命令提示不适用于Python

Question

I am trying to get the following command (which works when entered manually to shut down mysql server) working from python.

The line of code I am running is:

os.system('"C:\Program Files\MySQL\MySQL Server 5.1\bin\mysqladmin" -u demo -pdemopw shutdown')

Any ideas why this would work from the command prompt, but not from os.system, and how I can fix it?

Answer 1

When working with Windows file\\folder paths, I almost always use raw strings. Here is an example:

sql_admin = r"C:\Program Files\MySQL\MySQL Server 5.1\bin\mysqladmin"

Notice the r at the beginning of the string. That turns the string into a raw string. If you do not do this, then Python will look at the backslashes for special characters, such as \\n (new-line), \\t (tab) or \\b (backslash). You have the latter in your string.

One way to find out what's going on is to try printing the string in the interpreter. Take a look at the following example:

>>> "C:\Program Files\MySQL\MySQL Server 5.1\bin\mysqladmin"
'C:\\Program Files\\MySQL\\MySQL Server 5.1\x08in\\mysqladmin'

>>> r"C:\Program Files\MySQL\MySQL Server 5.1\bin\mysqladmin"
'C:\\Program Files\\MySQL\\MySQL Server 5.1\\bin\\mysqladmin'

There are two alternatives to using raw strings. The first one is to just escape the backslashes:

>>> "C:\\Program Files\\MySQL\\MySQL Server 5.1\\bin\\mysqladmin"

I've always found that a bit ugly and somewhat harder to read. You can also replace the backslashes with forward slashes:

>>> "C:/Program Files/MySQL/MySQL Server 5.1/bin/mysqladmin"

This will work, although it looks kind of odd if you're a Windows guy. So in the end, I still recommend using raw strings.

Answer 2

尝试将\\更改为/ ，它应该可以工作。