检查软件包是否已安装的Python方式 [英] Pythonic way to check if a package is installed or not
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问题描述
以Python方式检查Centos / Redhat中安装的软件包的列表吗?
Pythonic way to check list of packages installed in Centos/Redhat?
在bash脚本中,我会这样做:
In a bash script, I'd do:
rpm -qa | grep -w packagename
推荐答案
import sys
import rpm
ts = rpm.TransactionSet()
mi = ts.dbMatch( 'name', sys.argv[1] )
try :
h = mi.next()
print "%s-%s-%s" % (h['name'], h['version'], h['release'])
except StopIteration:
print "Package not found"
- TransactionSet()将打开RPM数据库
- dbMatch(不带参数)将设置一个匹配迭代器来遍历整套已安装的软件包,您可以在match迭代器上调用next来获取下一个条目,即代表一个包的标头对象
-
dbMatch也可以用于查询特定的包,您需要传递名称标签的名称,以及您要查找的标签的值:
- TransactionSet() will open the RPM database
- dbMatch with no paramters will set up a match iterator to go over the entire set of installed packages, you can call next on the match iterator to get the next entry, a header object that represents one package
dbMatch can also be used to query specific packages, you need to pass the name of a tag, as well as the value for that tag that you are looking for:
dbMatch('name','mysql')
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