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xrange() was removed in Python 3 in favor of range()

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@daniel-s-ingram Similar changes needed on Problems 25 and 28 so they can run on Python 3.

flake8 testing of https://github.com/TheAlgorithms/Python on Python 3.6.3

$ __flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics__
```
./Project Euler/Problem 10/sol1.py:5:11: F821 undefined name 'xrange'
	for i in xrange(2, int(sqrt(n))+1):
          ^
./Project Euler/Problem 10/sol1.py:17:11: F821 undefined name 'xrange'
	for i in xrange(3, n, 2):
          ^
./Project Euler/Problem 25/sol1.py:10:12: F821 undefined name 'xrange'
		for i in xrange(2, n+1):
           ^
./Project Euler/Problem 28/sol1.py:7:11: F821 undefined name 'xrange'
	for i in xrange(1, int(ceil(n/2.0))):
          ^
4     F821 undefined name 'xrange'
```
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cclauss 2018-03-19 03:18:18 +01:00 committed by GitHub
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6
Project Euler/Problem 10/sol1.py
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@ -1,6 +1,12 @@
from __future__ import print_function
from math import sqrt
try:
xrange # Python 2
except NameError:
xrange = range # Python 3
def is_prime(n):
for i in xrange(2, int(sqrt(n))+1):
if n%i == 0: