In [1]:

    

a = 5
a = 6
print a


    

    




6

In [2]:

    

str = 'Hello ChinaHadoop'
str[-1] = '!'


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-fadf611d2a1a> in <module>()
      1 str = 'Hello ChinaHadoop'
----> 2 str[-1] = '!'

TypeError: 'str' object does not support item assignment

In [4]:

    

tup = (1,2,3)
tup[0] = 2


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-4-e71030bca61d> in <module>()
      1 tup = (1,2,3)
----> 2 tup[0] = 2

TypeError: 'tuple' object does not support item assignment

In [5]:

    

def print_info():
    """
        This is a function for information print
    """
    print 'Hello ChinaHadoop'

print_info?


    

In [9]:

    

print '%d %s cost me $%.2f.' %(2, 'books', 21.227)


    

    




2 books cost me $21.23.

In [11]:

    

s_val = '3.1415926'
print 'string value: %s' %s_val
f_val = float(s_val)
print 'float value: %f' %f_val
i_val = int(f_val)
print 'int value: %i' %i_val


    

    




string value: 3.1415926
float value: 3.141593
int value: 3

In [14]:

    

from datetime import datetime
dt = datetime(2016, 12, 3, 15, 0, 0)
print dt.month, dt.day


    

    




12 3

In [16]:

    

dt.strftime('%Y/%m/%d %H:%M')


    

    
Out[16]:





'2016/12/03 15:00'

In [17]:

    

dt.strftime('%d/%m/%Y %H:%M')


    

    
Out[17]:





'03/12/2016 15:00'

In [20]:

    

datetime.strptime('20161203', '%Y%m%d')


    

    
Out[20]:





datetime.datetime(2016, 12, 3, 0, 0)

In [21]:

    

m = -1

if m < 0:
    print 'negative'
elif m > 0:
    print 'positive'
else:
    print 'zero'


    

    




negative

In [23]:

    

l = range(20) # [0, 1, 2, ..., 19]
for i in l:
    if i%2 == 0:
        continue
    if i == 15:
        break
    print i


    

    




1
3
5
7
9
11
13

In [26]:

    

i = 1
sum = 0
while i <= 100:
    sum += i
    i += 1
print sum


    

    




5050

In [28]:

    

def f():
    #TODO: test pass
    pass


    

In [31]:

    

def divide(x, y):
    """
        do division
    """
    try:
        return x/y
    except:
        return 'error happens'
    
print divide(8,2)
print divide('8', 2)


    

    




4
error happens

In [32]:

    

range(1, 20, 2)


    

    
Out[32]:





[1, 3, 5, 7, 9, 11, 13, 15, 17, 19]

In [35]:

    

xrange(1, 20, 2)


    

    
Out[35]:





xrange(1, 21, 2)

In [36]:

    

%time [x for x in range(1000)]


    

    




Wall time: 1 ms






    
Out[36]:





[0,
 1,
 2,
 3,
 4,
 5,
 6,
 7,
 8,
 9,
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 12,
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 864,
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 887,
 888,
 889,
 890,
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 892,
 893,
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 897,
 898,
 899,
 900,
 901,
 902,
 903,
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 905,
 906,
 907,
 908,
 909,
 910,
 911,
 912,
 913,
 914,
 915,
 916,
 917,
 918,
 919,
 920,
 921,
 922,
 923,
 924,
 925,
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 928,
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 933,
 934,
 935,
 936,
 937,
 938,
 939,
 940,
 941,
 942,
 943,
 944,
 945,
 946,
 947,
 948,
 949,
 950,
 951,
 952,
 953,
 954,
 955,
 956,
 957,
 958,
 959,
 960,
 961,
 962,
 963,
 964,
 965,
 966,
 967,
 968,
 969,
 970,
 971,
 972,
 973,
 974,
 975,
 976,
 977,
 978,
 979,
 980,
 981,
 982,
 983,
 984,
 985,
 986,
 987,
 988,
 989,
 990,
 991,
 992,
 993,
 994,
 995,
 996,
 997,
 998,
 999]

In [37]:

    

%time [x for x in xrange(1000)]


    

    




Wall time: 1e+03 µs






    
Out[37]:





[0,
 1,
 2,
 3,
 4,
 5,
 6,
 7,
 8,
 9,
 10,
 11,
 12,
 13,
 14,
 15,
 16,
 17,
 18,
 19,
 20,
 21,
 22,
 23,
 24,
 25,
 26,
 27,
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 251,
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 255,
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 257,
 258,
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 260,
 261,
 262,
 263,
 264,
 265,
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 269,
 270,
 271,
 272,
 273,
 274,
 275,
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 278,
 279,
 280,
 281,
 282,
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 284,
 285,
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 293,
 294,
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 300,
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 304,
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 346,
 347,
 348,
 349,
 350,
 351,
 352,
 353,
 354,
 355,
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 480,
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 638,
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 999]

In [38]:

    

a = 5
b = a
a = 3
print a
print b


    

    




3
5

In [2]:

    

def fun1(a):
    a = 2
    print a
    
b = 3

fun1(b)
print b


    

    




2
3

In [39]:

    

l_1 = [1, 2, 3]
l_2 = l_1
l_1.append(4)
print l_1
print l_2


    

    




[1, 2, 3, 4]
[1, 2, 3, 4]

In [3]:

    

def fun2(lst):
    lst[0] = 5
    print lst
    
lst1 = range(5)
print lst1

fun2(lst1)
print lst1


    

    




[0, 1, 2, 3, 4]
[5, 1, 2, 3, 4]
[5, 1, 2, 3, 4]

In [9]:

    

import copy
 
a = [[1, 2, 3], [4, 5, 6]]
b = a
c = copy.copy(a)
d = copy.deepcopy(a)
 
print 'a-id:', id(a)
print 'b-id:',id(b)
print 'c-id:',id(c)
print 'd-id:',id(d)

a.append(15)
a[1][2] = 10

print 'processed...'
print a
print b
print c
print d


    

    




a-id: 66053768
b-id: 66053768
c-id: 66621832
d-id: 66112456
processed...
[[1, 2, 3], [4, 5, 10], 15]
[[1, 2, 3], [4, 5, 10], 15]
[[1, 2, 3], [4, 5, 10]]
[[1, 2, 3], [4, 5, 6]]

In [ ]: