Циклы с условием

2.5.1.py

# -*- encoding: utf-8 -*-
"""
Базовый синтаксис
"""

x = 1
while x <= 100:
    print x
    x += 1

2.5.2.py

# -*- encoding: utf-8 -*-
"""
Прерывание цикла
"""

while 1:
    word = raw_input('Please enter a word: ')
    if not word: 
        break
    print 'The word was ' + word

2.5.3.py

# -*- encoding: utf-8 -*-
"""
Цикл с завершением
"""

y = 10

x = y / 2                          # for some y > 1
while x > 1:
    if y % x == 0:                 # remainder
        print y, 'has factor', x
        break                      # skip else
    x = x-1
else:                              # normal exit
    print y, 'is prime'

2.5.4.py

# -*- encoding: utf-8 -*-
"""
Угадай моё число
"""

import random  

# set the initial values from 1 to 5
the_number = random.randrange(5) + 1
guess = int(raw_input("Take a guess: "))
tries = 1

# guessing loop
while (guess != the_number):
    if (guess > the_number):
        print "Lower..." 
    else:
        print "Higher..." 

    guess = int(raw_input("Take a guess: "))
    tries += 1

print "You guessed it!  The number was", the_number
print "And it only took you", tries, "tries!\n"