Python check file system usage

script.py

#!/usr/bin/python
import os;
import yagmail;

## functions
def fs_data_raw():
  df_raw = os.popen("df -h --output=source,pcent,target | awk 'NR>1'").read().strip().split("\n")
  return df_raw

def check_threshold(string, limit):
  src, usg_raw, mounted_on = string.split()
  usg = int(usg_raw.replace('%', '')) #remove trailing % and convert to int
  if (usg >= limit):
    message = f"File System {src} mounted on {mounted_on} is above threshold: {usg}% used"
    print(message) #log
    email_content.append(message)

def send_email(e_to, e_from, e_subject, e_content):
  email = yagmail.SMTP(e_from, oauth2_file="~/oauth_client_secret.json")
  if (logs_exists()):
    email.send(
      to = e_to,
      subject = e_subject,
      contents = e_content,
    )
  else:
    print("No file system have reached the threshold")

def logs_exists():
  return len(email_content) > 1


## main
threshold = 50
email_to = "carobaldino@frba.utn.edu.ar"
email_from = "caro.baldino@gmail.com"
email_subject = "Testing Python XX"
email_content = [f'The following file systems have reached the threshold set of {threshold}%:'] #First line of the email


for row in fs_data_raw():
  check_threshold(row, threshold)

send_email(email_to, email_from, email_subject, email_content)