extract all slack users info

from slacker import Slacker

#
# https://api.slack.com/custom-integrations/legacy-tokens
#
token = "--- put api token here ---"
slack = Slacker(token)

#
# Get users list
#
response = slack.users.list()
users = response.body['members']


#
# filter and extract data
#
rows = []
for user in users:
    if "email" in user["profile"]:
        # put email in dictionary
        d = {"email": user["profile"]["email"]}

        # put other fields in dictionary if present
        fields = ["real_name", "first_name", "last_name", "title", "phone"]
        for f in fields:
            if f in user["profile"]:
                d[f] = user["profile"][f]
                
        rows.append(d)

#
# export to csv
#
import csv
with open('slack_users.csv', 'w', newline='') as csvfile:
    fieldnames = ["email", "real_name", "first_name", "last_name", "title", "phone"]
    writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
    writer.writeheader()
    [writer.writerow(r) for r in rows]