count_user_num.py

import boto3
cognito = boto3.client('cognito-idp')
UserPoolId='YOUR_USERPOOL_ID'

def getUsers():
    response = cognito.list_users(
        UserPoolId=UserPoolId,
        Filter="cognito:user_status='CONFIRMED'"
    )
    return response

def getUsersWithPagenation(PaginationToken):
    response = cognito.list_users(
        UserPoolId=UserPoolId,
        PaginationToken=PaginationToken,
        Filter="cognito:user_status='CONFIRMED'"
    )
    return response

def listUsers(users, num):
    num += len(users['Users'])
    if 'PaginationToken' in users:
        users = getUsersWithPagenation(users['PaginationToken'])
        listUsers(users, num)
    else:
        print(num)

num = 0
users=getUsers()
listUsers(users, num)