#!/usr/bin/env python
# coding: utf-8

# ### 序列

# In[6]:


edward = ['Edward', 42]


# In[7]:


john = ['John', 50]


# In[8]:


database = [edward, john]


# In[9]:


database


# In[19]:


database[0]


# ### 索引

# In[18]:


database[0][0][-1]


# In[22]:


fourth = input('Year:')[3]


# In[23]:


fourth


# In[27]:


months = [
    'Jan.',
    'Feb.',
    'Mar.',
    'Apr.',
    'May',
    'Jun.',
    'Jul',
    'Aug.',
    'Sep.',
    'Oct.',
    'Nov.',
    'Dec.'
]
# 此处乘法为对应字符的个数
endings = ['st','nd','rd'] + 17 * ['th']\
        + ['st','nd','rd'] + 7 * ['th']\
        + ['st']
year = input('Year: ')
month = input('Month(1-12):')
day = input('Day(1-31):')
month_number = int(month)
day_number = int(day)
month_name = months[month_number-1]
ordinal = day + endings[day_number-1]
print(month_name + ' ' + ordinal + ',' + year)


# ### 分片

# In[28]:


tag = '<a href="http://csyanwb.cn">JingShui</a>'


# In[29]:


tag[9:-14]


# In[31]:


numbers = [1,2,3,4,5,6,7,8,9,10]


# In[32]:


numbers[3:6]


# In[33]:


numbers[0:1]


# In[38]:


numbers[-3:0] #向右 --->


# In[39]:


numbers[-3:]


# In[40]:


numbers[:3]


# In[42]:


numbers[:]


# In[43]:


numbers[0:10:1]


# In[44]:


numbers[0:10:2]


# In[57]:


numbers[::2]


# In[49]:


numbers[1:9:2]


# In[52]:


numbers[9:1:-2]


# In[55]:


numbers[1:9:-2]


# In[58]:


numbers[::-2]


# In[59]:


numbers[:5:-2]


# ### 加法

# In[60]:


[1,2,3]+[4,5,6]


# In[61]:


'Hello,' + 'world!'


# In[62]:


[1,2,3] + 'Hello'


# ### 乘法
# 

# In[63]:


[42]*10


# In[64]:


'python'*5


# In[66]:


sequence = [None]*10


# In[67]:


sequence


# In[82]:


sentence = input("Sentence:")
screen_width = 80
text_width = len(sentence)
box_width = text_width + 2
left_margin = (screen_width - box_width)//2
print("                                  ")
print(' '*left_margin + '+' + "-"*(box_width-2) + '+')
print(' '*left_margin + '|' + " "*text_width + '|')
print(' '*left_margin + '|' +  sentence + '|')
print(' '*left_margin + '|' + " "*text_width + '|')
print(' '*left_margin + '+' + "-"*(box_width-2) + '+')
print("                                   ")


# ### 成员资格

# In[83]:


permissions= 'rw'


# In[85]:


'w' in permissions


# In[87]:


users = ['mlh','ywb','bar']


# In[88]:


input("Enter your user name:") in users


# In[89]:


subject = "$$$ Get rich now!!! $$$"


# In[90]:


'$$$' in subject


# In[91]:


database = [
    ['albert', '1234'],
    ['dilbert','4567'],
    ['smith','7524'],
    ['jones','9843']
]
username = input("User name:")
pin = input("PIN Code:")
if [username, pin] in database:
    print("Access granted!")


# ### 长度&最大、最小值

# In[92]:


numbers=[100,34,678]


# In[93]:


len(numbers)


# In[94]:


max(numbers)


# In[96]:


min(numbers)


# In[97]:


max(32,65,12,78,99)


# ### 列表 list

# In[98]:


list("Hello")


# 元素赋值

# In[99]:


x = [1,1,1]


# In[100]:


x[1] = 2


# In[101]:


x


# 删除元素 del

# In[102]:


del x[2]


# In[103]:


x


# 分片赋值

# In[104]:


name = list('Perl')


# In[105]:


name


# In[107]:


name[2:] = list("ar")


# In[108]:


name


# In[109]:


name[1:] = list("ython")


# In[110]:


name


# In[112]:


numbers = [1,5]


# In[115]:


numbers[1:1] = [2,3,4]


# In[116]:


numbers


# In[117]:


numbers[1:4] = []


# In[118]:


numbers


# ### append

# In[121]:


lst = [1,2,3]


# In[122]:


lst.append(4)


# In[123]:


lst


# ### count

# In[124]:


['to','be','or','not','to','be'].count('to')


# In[125]:


x = [[1,2],1,1,[2,1,[1,2]]]


# In[126]:


x.count([1,2])


# ### extend

# In[160]:


a = [1,2,3]
b = [4,5,6]


# In[161]:


a.extend(b)
a


# In[162]:


a = [1,2,3]
b = [4,5,6]


# In[163]:


a[len(a):] = b
a


# ### index

# In[165]:


knights = ['we', 'are', 'the', 'knights', 'who', 'say', 'ni']
knights.index('who')


# In[166]:


knights.index("herring")


# ### insert

# In[171]:


numbers = [1,2,3,5,6,7]
numbers.insert(3,'four')
numbers


# In[172]:


numbers = [1,2,3,5,6,7]
numbers[3:3] = ['four']
numbers


# ### pop

# In[182]:


x = [1,2,3]
x.pop()


# In[183]:


x


# In[184]:


x.pop(0)
x


# In[185]:


x = [1,2,3]
x.append(x.pop())
x


# ### remove

# In[189]:


x = ['to','be','or','not','to','be']
x.remove('be')


# In[258]:


x


# 
# ### reverse

# In[191]:


x = [1,2,3]
x.reverse()


# In[192]:


x


# In[194]:


list(reversed(x))


# ### sort

# In[207]:


x = [5,3,9,1,6,8]


# In[196]:


x.sort()


# In[197]:


x


# In[206]:


y = x.sort()  # Wrong


# In[205]:


print(y)


# In[215]:


x = [5,3,9,1,6,8]
y = x #直接赋值也不能保持x不发生变化！
y.sort()
x


# In[218]:


x = [5,3,9,1,6,8]
y = sorted(x) #sorted
x


# In[219]:


y


# In[235]:


sorted('Python') #现在已区分大小写！


# ### 高级排序

# cmp在python3未指定

# In[248]:


x = ['asdasdasd','sdssdsd','weqqw','weqe','dsfddfs']
x.sort(key=len)
x


# In[250]:


x = [4,6,2,1,7,9]
x.sort(reverse=True)
x


# ### 元组

# In[252]:


1,2,3


# In[253]:


()


# In[254]:


42


# In[255]:


42,


# In[256]:


3*(40+2)


# In[257]:


3*(40+2,)


# ### tuple

# In[259]:


tuple([1,2,3])


# In[260]:


tuple('abc')


# In[261]:


tuple((1,2,3))


# In[263]:


x = 1,2,3
x[1]


# In[264]:


x[0:2]