#!/usr/bin/env python3

# n = int(input('Enter the number of rows: '))

# while n > 0:

# print('*' * n)

# n -= 1

# n = int(input('Enter the number of rows: '))

# k = 1

# while k <= n:

# print('*' * k)

# k += 1

# n = int(input('Enter the number of rows: '))

# for k in range(n):

# x = '*' * (n-k)

# y = ' ' * k

# print(y + x)

'''list'''

# 列表中的元素，不必是同一类型

'''列表索引，切片'''

# a = [1, 342, 223, 'India', 'Fedora']

# print(a[-1])

# #切片不改变正在操作的列表

# print(a[:3]) # [)切片区间

# print(a[:])

# print(a[0::2]) # 步长

# '''列表元素相加'''

# b = [ 36, 89, 100, 45, -2]

# c = list(range(5))

# print(c+b) # 列表len增加

# new = []

# for k in range(len(c)):

# new.append(c[k]+b[k])

# print(new)

'''列表索引/切片允许改变'''

# b[2:4] = [0, 1]

# print(b)

# '''value是否存在'''

# print(-2 in b)

# if b:

# print('不是空列表')

'''列表嵌套'''

# a1 = list('abc')

# b1 = list('123')

# x = [a1,b1]

# print(x[0][1])

'''for loop'''

# c1 = list(range(0,15,3))

# for k in c1[::2]:

# print(k)

'''continue'''

# while True: # 提供loop forever

# n = int(input('Please enter an Integer: '))

# if n < 0:

# continue

# elif n == 0:

# break

# else:

# print('Square is ',n ** 2)

# print('Goodbye')

'''for loop 中的else'''

# 检测循环是否执行完毕

# for k in range(5):

# print(k)

# else:

# print('gg')

'''sticks'''

sticks = 21

print('There are 21 sticks,you can take 1-4 number of sticks at a time.')

print('Whoever will take the last stick will loose.')

while True:

print('Sticks left: ',sticks)

if sticks == 1:

print('You took the last sticks, you loose.')

break # break 跳出循环

sticks_taken = int(input('Take the sticks(1-4): '))

if sticks_taken <= 0 or sticks_taken >=5:

print('Wrong choice')

continue # wrong choice & continue instead of assert

print('Computer took: ',(5 - sticks_taken), '\n')

sticks -= 5