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

# In[1]:


s = "Hello, world!"


# In[2]:


for c in s:
    print(c)


# In[4]:


a = [1, 2, 3, True, [5,6,7], 3.1415]


# In[6]:


for item in a:
    print("hello")
    print(item)


# In[7]:


for i in range(10):
    print(i)


# In[8]:


range(10)


# In[9]:


list(range(10))


# In[10]:


n = int(input())


# In[11]:


n


# In[17]:


for i in range(n, 0, -1):
    print(i, i**2)


# In[19]:


i = 15
while i > 0:
    print(i, i ** 2)
    i -= 1   # i = i - 1


# In[20]:


i = 0
while True:
    print(i)
    i += 1
    if i > 15:
        break
        
    


# In[21]:


i = 0
while i < 15:
    i += 1
    if i % 3 == 0:
        continue
    print(i)


# In[22]:


if i < 15:
    print("<")
elif i == 15:
    print("=")
elif i == 16:
    print("approximately ==")
else:
    print(">")


# In[23]:


if i < 15:
    print("<")
else:
    if i == 15:
        print("=")
    else:
        if i == 16:
            print("==")
        else:
            print(">")


# In[30]:


for i in range(3):
    print(i)
else:
    print("else")


# In[32]:


for i in range(3):
    print(i)
    if i == 2:
        break
else:
    print("else")


# In[33]:


if i > 0 and i < 15:
    print("OK")


# In[34]:


A = i > 0


# In[35]:


A


# In[36]:


B = i < 15


# In[37]:


C = i == 10


# In[38]:


if A and B:
    print(1)
elif A and C:
    print(2)


# In[39]:


if A:
    if B:
        print(1)
    elif C:
        print(2)


# In[40]:


if A and not B or not A and B:
    print(1)


# In[41]:


if i > 0 and i <= 15:
    print("OK")


# In[42]:


if 0 < i <= 15:
    print("OK")


# In[43]:


if i != 10:
    print("Not equal!")


# In[44]:


if i <> 10:
    print("Not equal at all!")


# In[45]:


a = [1, 2, 3, True, None, [5,6,7], 3.14]


# In[46]:


a.append(17)


# In[47]:


a


# In[48]:


a.pop()


# In[49]:


a


# In[50]:


a += ["a", "b", "c"]


# In[51]:


a


# In[52]:


[0] * 10


# In[53]:


a = [[1,2,3]] * 5


# In[54]:


a


# In[55]:


a[0][0] = 0


# In[56]:


a


# In[57]:


a[-1][0] = 1


# In[58]:


a


# In[59]:


b = (1, 2, 3)


# In[60]:


a = [1, 2, 3]


# In[61]:


type(a)


# In[62]:


type(b)


# In[63]:


len(b)


# In[64]:


b[1]


# In[66]:


d = {"Monday": 1, "Tuesday": 2, "Wednesday": 3}


# In[67]:


d["Tuesday"]


# In[68]:


print(d)


# In[69]:


d2 = {(8, 9, 2015): 80, (4, 9, 2015): 90}


# In[70]:


d2[(4, 9, 2015)]


# In[71]:


d2[123123]


# In[72]:


d[(1,2,3)] = False


# In[73]:


d


# In[74]:


del d[(1,2,3)]


# In[75]:


d


# In[77]:


for key in d:
    print(key, d[key])


# In[78]:


for key in sorted(d.keys()):
    print(key, d[key])


# In[79]:


d["Thursday"] = 4


# In[80]:


d["Friday"] = 5


# In[82]:


d["Saturday"] = 6


# In[83]:


d["Sunday"] = 0


# In[84]:


for key in sorted(d.keys()):
    print(key, d[key])


# In[87]:


pairs = list(d.items())


# In[88]:


pairs


# In[89]:


pairs = [(d[key], key) for key in d]


# In[90]:


pairs


# In[91]:


pairs.sort()


# In[92]:


pairs


# In[94]:


d_rev = dict(pairs)


# In[95]:


d_rev


# In[96]:


d_rev[5]


# In[98]:


dict([(1, "a"), (1, "b"), (2, "c")])


# In[99]:


s = "Elementary, my dear Watson!"


# In[100]:


letters = {}
for c in s:
    if c not in letters:
        letters[c] = 1
    else:
        letters[c] += 1


# In[101]:


for key in letters:
    print(key, letters[key])


# In[103]:


letters = {}
for c in s:
    letters[c] = letters.get(c, 0) + 1


# In[104]:


print(letters)


# In[106]:


A = set([1, 2, 3])


# In[107]:


B = set([2, 3, 4, 5])


# In[108]:


A.union(B)


# In[109]:


A.intersection(B)


# In[110]:


print(A in B)


# In[111]:


print(3 in B)


# In[112]:


len(A)


# In[113]:


len(B)


# In[114]:


A.difference(B)


# In[116]:


A | B


# In[118]:


A & B


# In[119]:


A - B


# In[120]:


s


# In[121]:


letters = set()


# In[122]:


for c in s:
    letters.add(c)


# In[123]:


print(letters)


# In[124]:


print("".join(sorted(letters)))


# In[125]:


ord(".")


# In[126]:


letters = set(s)


# In[127]:


print("".join(sorted(letters)))


# In[128]:


d


# In[129]:


d["January"]


# In[130]:


d.get("January", 1234)


# In[131]:


d.get("Monday", 1234)


# In[132]:


s.lower()


# In[134]:


print(d.get("January"))


# In[135]:


if "Monday" in d:
    print(d["Monday"])
else:
    print(1234)


# In[ ]: