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import operator

def max_value(m):
    return  max(m.iteritems(), key=operator.itemgetter(1))[0] 

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from fractions import gcd

def eulers_totient(n):
    p = 0
    for k in range(1, n+1):
        if gcd(n,k) == 1:
            p += 1
    return p

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def swap(s, i, j):
    return ''.join((s[:i], s[j], s[i+1:j], s[i], s[j+1:]))

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import itertools

def remove_duplicate(s):
    return ''.join(ch for ch, _ in itertools.groupby(s))

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def remove_spaces(s):
    return s.replace(' ', '')

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def remove_leading_zeros(s):
    while s[0] == '0':
        s = s[1:]
    return s

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def remove_trailing_zeros(s):
    while s[-1] == '0':
        s = s[:-1]
    return s

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import datetime

def isDate(date_text, fmt):
    try:
        datetime.datetime.strptime(date_text, fmt)
    except ValueError:
        return False

    return True

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def sum_of_digits(n):
    s = 0
    while n > 0:
        s += n % 10
        n /= 10
    return s

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#!/usr/bin/env python3

""" Rename an AWS dynamodb table attribute with an exponential timing back-off
"""

import logging
from time import sleep

import boto3
from boto3.dynamodb.conditions import Attr