while True:
    out2 = subprocess.check_output('/root/script1', universal_newlines=True)
    print(out2)
    if out2 != "No":
        print("123")
    time.sleep(60)

 if out2 != "No":

 print("123")

    
import subprocess
res = subprocess.check_output("echo No", shell=True)
print(res, type(res))
print(res == "No\n")
res = res.decode().strip()
print(res == "No", type(res))

  <class 'str'>
123
NO

 import subprocess
 while True:
     out2 = subprocess.check_output('/home/angel/script6', universal_newlines=True)
     print(out2, type(out2))
     if out2 != "NO":
         print("123")

 #!/bin/bash
echo "NO"