import slackclient
import time
import os

slackClient = slackclient.SlackClient(os.environ["SLACK_TOKEN"])
slackClient.rtm_connect()
lastPingTime = 0
while True:
    for message in slackClient.rtm_read():
        if message["type"] == "team_join":
            username = message["user"]["name"]
            body = os.environ["WELCOME_MESSAGE"].format(username)
            slackClient.api_call("chat.postMessage", channel="#general",
                text=body, username="The New Ro-Bot", icon_emoji=":wave:",
                link_names = True)

    now = time.time()
    if now - lastPingTime >= 3:
        slackClient.server.ping()
        lastPingTime = now

    time.sleep(.1)

import slackclient
import time
import os

slackClient = slackclient.SlackClient(os.environ["SLACK_TOKEN"])
slackClient.rtm_connect()
lastPingTime = 0
print(os.environ)
while True:
    for message in slackClient.rtm_read():
        if message["type"] == "team_join":
            username = message["user"]["name"]
            body = os.environ["WELCOME_MESSAGE"].format(username)
            slackClient.api_call("chat.postMessage", channel="#general",
                text=body, username="The New Ro-Bot", icon_emoji=":wave:",
                link_names = True)

    now = time.time()
    if now - lastPingTime >= 3:
        slackClient.server.ping()
        lastPingTime = now

    time.sleep(.1)

Add debug print