SELECT (SELECT CallDurationInSeconds, CallData__c, Closed_After_DueDate__c,
    Reminder_Date_Time_LEX__c, PrimaryWhoId, Current_User_Assigned__c, LastModifiedById,
    Time_taken_to_Close_the_Task__c, Priority, Location, CallObject, OwnerId, IsAllDayEvent,
    AdCentralActivityId__c, Status, CallDisposition, Description, ActivitySubtype,
    LastModifiedDate, ActivityType, Original_Due_Date__c, Task_Closed_Date__c, Push_Counter__c,
    WhoId, WhatId, ActivityDate, CurrencyIsoCode, dnis__c, IsHighPriority, IsDeleted,
    AccountId, CallType, Call_Recording__c, EndDateTime, DurationInMinutes, IsVisibleInSelfService,
    CreatedById, StartDateTime, PrimaryAccountId, IsReminderSet, SFDC_Active__c, IsClosed,
    ReminderDateTime, SystemModstamp, CreatedDate, IsTask, AlternateDetailId, Id,
    Activity_Type__c FROM ActivityHistories WHERE SystemModstamp >= 2018-10-04T00:00:00Z
 and SystemModstamp
    < 2018-10-05T00:00:00Z
) FROM Account

sf = Salesforce(security_token='token', username='uname', password='pwd', instance_url='https://company.my.salesforce.com')
result = sf.query(query_input)
df = pd.DataFrame.from_dict(result['records'])
df.drop('attributes', 1, inplace=True)
df['row_hash'] = df.apply(lambda x: hash(tuple(x)), axis=1)