update python_changetxt.py.

python_changetxt.py

@@ -73,7 +73,7 @@ while True:
 
 #!/bin/bash
 
-cat >>/etc/yum.repos.drhel7.repo<<OK
+cat >>/etc/yum.repos.d/rhel7.repo<<OK
 [rhel7]
 name=this
 baseurl=https://mirrors.aliyun.com/centos/7/os/x86_64/