Прошёл главу 8

ch8/average_age.py

@@ -0,0 +1,32 @@
+def average_age(name):
+    average_age = 0
+    i = 0
+    friends = users[name]['Друзья']
+    for friend in friends:
+        average_age += users[friend]['Возраст']
+        i += 1
+    average_age = average_age / i
+    return average_age
+
+
+def anti_soc(users):
+    max = 1000
+    for name in users:
+        user = users[name]
+        friends = user['Друзья']
+        if len(friends) < max:
+            most_anti_soc = name
+            max = len(friends)
+    return most_anti_soc
+
+users = {}
+users['Ким'] = {'Эл. почта': 'kim@oreilly.com', 'Пол': 'ж', 'Возраст': 27, 'Друзья': ['Джон', 'Джош']}
+users['Джон'] = {'Эл. почта': 'john@oreilly.com', 'Пол': 'м', 'Возраст': 24, 'Друзья': ['Ким', 'Джош']}
+users['Джош'] = {'Эл. почта': 'josh@oreilly.com', 'Пол': 'м', 'Возраст': 32, 'Друзья': ['Ким']}
+
+
+print(average_age('Ким'))
+print(average_age('Джон'))
+print(average_age('Джош'))
+
+print(anti_soc(users))

ch8/fibonacci.py

@@ -0,0 +1,29 @@
+import time
+
+cache = {}
+def fibonacci(n):
+    '''
+    :param n: - число
+    :return: - булево
+
+    Время выполнения будет очень - очень долгим
+    '''
+    global cache
+    if n in cache:
+        return cache[n]
+    if n == 0:
+        return 0
+    elif n == 1:
+        return 1
+    else:
+        result = fibonacci(n - 1) + fibonacci(n - 2)
+    cache[n] = result
+    return result
+
+
+for i in range(20, 55, 5):
+    start = time.time()
+    result = fibonacci(i)
+    end = time.time()
+    duration = end - start
+    print(i, result, duration)

ch8/koch.py

@@ -0,0 +1,32 @@
+import turtle
+
+def setup(pencil):
+    pencil.color('blue')
+    pencil.penup()
+    pencil.goto(-200, 100)
+    pencil.pendown()
+
+
+def koch(pencil, size, order):
+    if order == 0:
+        pencil.forward(size)
+    else:
+        for angle in [60, -120, 60, 0]:
+            koch(pencil, size/3, order-1)
+            pencil.left(angle)
+
+
+def main():
+    pencil = turtle.Turtle()
+    setup(pencil)
+
+    order = 4
+    size = 400
+    for i in range(0, 3):
+        koch(pencil, size, order)
+        pencil.right(120)
+
+if __name__ == '__main__':
+    main()
+    turtle.tracer(100)
+    turtle.mainloop()

ch8/palindrome.py

@@ -0,0 +1,14 @@
+def is_palindrome(word):
+    if len(word) <= 0:
+        return True
+    else:
+        if word[0] == word[-1]:
+            return is_palindrome(word[1:-1])
+        else:
+            return False
+
+
+words = ['tacocat', 'radar', 'yak', 'radar', 'kayjak']
+
+for word in words:
+    print(is_palindrome(word))

ch8/sum.py

@@ -0,0 +1,39 @@
+marbles = [10, 13, 39, 14, 41, 9, 3, 100]
+
+
+def recursive_compute_sum(list):
+    if len(list) == 0:
+        return 0
+    else:
+        first = list[0]
+        rest = list[1:]
+        sum = first + recursive_compute_sum(rest)
+        return sum
+
+
+sum = recursive_compute_sum(marbles)
+print('Сумма равна', sum)
+
+letter = 'radars'
+
+def polindrom(str):
+    # с помощию цикла
+    # list = []
+    # ob_list = []
+    # for i in str:
+    #     list.append(i)
+    # for i in str[::-1]:
+    #     ob_list.append(i)
+    # if list == ob_list:
+    #     return 'полиндром'
+    # else:
+    #     return 'не полиндром'
+    # без цикла, просто через срез
+    if str == str[::-1]:
+        return 'полиндром'
+    else:
+        return 'не полиндром'
+
+status = polindrom(letter)
+print('Слово', letter, status)
+