2020-10-19 21:08:55

docs/da/007.md

@@ -6,14 +6,14 @@
 
 In [1]:
 
-```
+```py
 2 + 2
 
 ```
 
 Out[1]:
 
-```
+```py
 4
 ```
 
@@ -21,14 +21,14 @@ Out[1]:
 
 In [2]:
 
-```
+```py
 2.0 + 2.5
 
 ```
 
 Out[2]:
 
-```
+```py
 4.5
 ```
 
@@ -36,14 +36,14 @@ Out[2]:
 
 In [3]:
 
-```
+```py
 2 + 2.5
 
 ```
 
 Out[3]:
 
-```
+```py
 4.5
 ```
 
@@ -53,7 +53,7 @@ Out[3]:
 
 In [4]:
 
-```
+```py
 a = 0.2
 
 ```
@@ -64,7 +64,7 @@ a = 0.2
 
 In [5]:
 
-```
+```py
 s = "hello world"
 s
 
@@ -72,13 +72,13 @@ s
 
 Out[5]:
 
-```
+```py
 'hello world'
 ```
 
 In [6]:
 
-```
+```py
 s = 'hello world'
 s
 
@@ -86,7 +86,7 @@ s
 
 Out[6]:
 
-```
+```py
 'hello world'
 ```
 
@@ -94,14 +94,14 @@ Out[6]:
 
 In [7]:
 
-```
+```py
 s = """hello
 world"""
 print s
 
 ```
 
-```
+```py
 hello
 world
 
@@ -109,14 +109,14 @@ world
 
 In [8]:
 
-```
+```py
 s = '''hello
 world'''
 print s
 
 ```
 
-```
+```py
 hello
 world
 
@@ -126,7 +126,7 @@ world
 
 In [9]:
 
-```
+```py
 s = "hello" + " world"
 s
 
@@ -134,7 +134,7 @@ s
 
 Out[9]:
 
-```
+```py
 'hello world'
 ```
 
@@ -142,40 +142,40 @@ Out[9]:
 
 In [10]:
 
-```
+```py
 s[0]
 
 ```
 
 Out[10]:
 
-```
+```py
 'h'
 ```
 
 In [11]:
 
-```
+```py
 s[-1]
 
 ```
 
 Out[11]:
 
-```
+```py
 'd'
 ```
 
 In [12]:
 
-```
+```py
 s[0:5]
 
 ```
 
 Out[12]:
 
-```
+```py
 'hello'
 ```
 
@@ -183,7 +183,7 @@ Out[12]:
 
 In [13]:
 
-```
+```py
 s = "hello world"
 s.split()
 
@@ -191,7 +191,7 @@ s.split()
 
 Out[13]:
 
-```
+```py
 ['hello', 'world']
 ```
 
@@ -199,14 +199,14 @@ Out[13]:
 
 In [14]:
 
-```
+```py
 len(s)
 
 ```
 
 Out[14]:
 
-```
+```py
 11
 ```
 
@@ -216,7 +216,7 @@ Python用`[]`来生成列表
 
 In [15]:
 
-```
+```py
 a = [1, 2.0, 'hello', 5 + 1.0]
 a
 
@@ -224,7 +224,7 @@ a
 
 Out[15]:
 
-```
+```py
 [1, 2.0, 'hello', 6.0]
 ```
 
@@ -232,14 +232,14 @@ Out[15]:
 
 In [16]:
 
-```
+```py
 a + a
 
 ```
 
 Out[16]:
 
-```
+```py
 [1, 2.0, 'hello', 6.0, 1, 2.0, 'hello', 6.0]
 ```
 
@@ -247,14 +247,14 @@ Out[16]:
 
 In [17]:
 
-```
+```py
 a[1]
 
 ```
 
 Out[17]:
 
-```
+```py
 2.0
 ```
 
@@ -262,14 +262,14 @@ Out[17]:
 
 In [18]:
 
-```
+```py
 len(a)
 
 ```
 
 Out[18]:
 
-```
+```py
 4
 ```
 
@@ -277,7 +277,7 @@ Out[18]:
 
 In [19]:
 
-```
+```py
 a.append("world")
 a
 
@@ -285,7 +285,7 @@ a
 
 Out[19]:
 
-```
+```py
 [1, 2.0, 'hello', 6.0, 'world']
 ```
 
@@ -295,7 +295,7 @@ Python用{}来生成集合，集合中不含有相同元素。
 
 In [20]:
 
-```
+```py
 s = {2, 3, 4, 2}
 s
 
@@ -303,7 +303,7 @@ s
 
 Out[20]:
 
-```
+```py
 {2, 3, 4}
 ```
 
@@ -311,14 +311,14 @@ Out[20]:
 
 In [21]:
 
-```
+```py
 len(s)
 
 ```
 
 Out[21]:
 
-```
+```py
 3
 ```
 
@@ -326,7 +326,7 @@ Out[21]:
 
 In [22]:
 
-```
+```py
 s.add(1)
 s
 
@@ -334,7 +334,7 @@ s
 
 Out[22]:
 
-```
+```py
 {1, 2, 3, 4}
 ```
 
@@ -342,7 +342,7 @@ Out[22]:
 
 In [23]:
 
-```
+```py
 a = {1, 2, 3, 4}
 b = {2, 3, 4, 5}
 a & b
@@ -351,7 +351,7 @@ a & b
 
 Out[23]:
 
-```
+```py
 {2, 3, 4}
 ```
 
@@ -359,14 +359,14 @@ Out[23]:
 
 In [24]:
 
-```
+```py
 a | b
 
 ```
 
 Out[24]:
 
-```
+```py
 {1, 2, 3, 4, 5}
 ```
 
@@ -374,14 +374,14 @@ Out[24]:
 
 In [25]:
 
-```
+```py
 a - b
 
 ```
 
 Out[25]:
 
-```
+```py
 {1}
 ```
 
@@ -389,14 +389,14 @@ Out[25]:
 
 In [26]:
 
-```
+```py
 a ^ b
 
 ```
 
 Out[26]:
 
-```
+```py
 {1, 5}
 ```
 
@@ -406,7 +406,7 @@ Python用`{key:value}`来生成Dictionary。
 
 In [27]:
 
-```
+```py
 d = {'dogs':5, 'cats':4}
 d
 
@@ -414,7 +414,7 @@ d
 
 Out[27]:
 
-```
+```py
 {'cats': 4, 'dogs': 5}
 ```
 
@@ -422,14 +422,14 @@ Out[27]:
 
 In [28]:
 
-```
+```py
 len(d)
 
 ```
 
 Out[28]:
 
-```
+```py
 2
 ```
 
@@ -437,14 +437,14 @@ Out[28]:
 
 In [29]:
 
-```
+```py
 d["dogs"]
 
 ```
 
 Out[29]:
 
-```
+```py
 5
 ```
 
@@ -452,7 +452,7 @@ Out[29]:
 
 In [30]:
 
-```
+```py
 d["dogs"] = 2
 d
 
@@ -460,7 +460,7 @@ d
 
 Out[30]:
 
-```
+```py
 {'cats': 4, 'dogs': 2}
 ```
 
@@ -468,7 +468,7 @@ Out[30]:
 
 In [31]:
 
-```
+```py
 d["pigs"] = 7
 d
 
@@ -476,7 +476,7 @@ d
 
 Out[31]:
 
-```
+```py
 {'cats': 4, 'dogs': 2, 'pigs': 7}
 ```
 
@@ -484,14 +484,14 @@ Out[31]:
 
 In [32]:
 
-```
+```py
 d.keys()
 
 ```
 
 Out[32]:
 
-```
+```py
 ['cats', 'dogs', 'pigs']
 ```
 
@@ -499,14 +499,14 @@ Out[32]:
 
 In [33]:
 
-```
+```py
 d.values()
 
 ```
 
 Out[33]:
 
-```
+```py
 [4, 2, 7]
 ```
 
@@ -514,14 +514,14 @@ Out[33]:
 
 In [34]:
 
-```
+```py
 d.items()
 
 ```
 
 Out[34]:
 
-```
+```py
 [('cats', 4), ('dogs', 2), ('pigs', 7)]
 ```
 
@@ -531,7 +531,7 @@ Out[34]:
 
 In [35]:
 
-```
+```py
 from numpy import array
 a = array([1, 2, 3, 4])
 a
@@ -540,7 +540,7 @@ a
 
 Out[35]:
 
-```
+```py
 array([1, 2, 3, 4])
 ```
 
@@ -548,27 +548,27 @@ array([1, 2, 3, 4])
 
 In [36]:
 
-```
+```py
 a + 2
 
 ```
 
 Out[36]:
 
-```
+```py
 array([3, 4, 5, 6])
 ```
 
 In [37]:
 
-```
+```py
 a + a
 
 ```
 
 Out[37]:
 
-```
+```py
 array([2, 4, 6, 8])
 ```
 
@@ -578,7 +578,7 @@ Python提供了一个很像MATLAB的绘图接口。
 
 In [38]:
 
-```
+```py
 %matplotlib inline
 from matplotlib.pyplot import plot
 plot(a, a**2)
@@ -587,7 +587,7 @@ plot(a, a**2)
 
 Out[38]:
 
-```
+```py
 [<matplotlib.lines.Line2D at 0x9fb6fd0>]
 ```
 
@@ -685,7 +685,7 @@ SaoBg7kk1YDBXJJqwGAuSTVgMJekGvhf3kAwE/Ra4D0AAAAASUVORK5CYII=
 
 In [39]:
 
-```
+```py
 line = '1 2 3 4 5'
 fields = line.split()
 fields
@@ -694,13 +694,13 @@ fields
 
 Out[39]:
 
-```
+```py
 ['1', '2', '3', '4', '5']
 ```
 
 In [40]:
 
-```
+```py
 total = 0
 for field in fields:
     total += int(field)
@@ -710,7 +710,7 @@ total
 
 Out[40]:
 
-```
+```py
 15
 ```
 
@@ -718,7 +718,7 @@ Python中有一种叫做列表推导式(List comprehension)的用法：
 
 In [41]:
 
-```
+```py
 numbers = [int(field) for field in fields]
 numbers
 
@@ -726,20 +726,20 @@ numbers
 
 Out[41]:
 
-```
+```py
 [1, 2, 3, 4, 5]
 ```
 
 In [42]:
 
-```
+```py
 sum(numbers)
 
 ```
 
 Out[42]:
 
-```
+```py
 15
 ```
 
@@ -747,14 +747,14 @@ Out[42]:
 
 In [43]:
 
-```
+```py
 sum([int(field) for field in line.split()])
 
 ```
 
 Out[43]:
 
-```
+```py
 15
 ```
 
@@ -762,12 +762,12 @@ Out[43]:
 
 In [44]:
 
-```
+```py
 cd ~
 
 ```
 
-```
+```py
 d:\Users\lijin
 
 ```
@@ -776,7 +776,7 @@ d:\Users\lijin
 
 In [45]:
 
-```
+```py
 f = open('data.txt', 'w')
 f.write('1 2 3 4\n')
 f.write('2 3 4 5\n')
@@ -788,7 +788,7 @@ f.close()
 
 In [46]:
 
-```
+```py
 f = open('data.txt')
 data = []
 for line in f:
@@ -800,19 +800,19 @@ data
 
 Out[46]:
 
-```
+```py
 [[1, 2, 3, 4], [2, 3, 4, 5]]
 ```
 
 In [47]:
 
-```
+```py
 for row in data:
     print row
 
 ```
 
-```
+```py
 [1, 2, 3, 4]
 [2, 3, 4, 5]
 
@@ -822,7 +822,7 @@ for row in data:
 
 In [48]:
 
-```
+```py
 import os
 os.remove('data.txt')
 
@@ -834,7 +834,7 @@ Python用关键词`def`来定义函数。
 
 In [49]:
 
-```
+```py
 def poly(x, a, b, c):
     y = a * x ** 2 + b * x + c
     return y
@@ -846,7 +846,7 @@ poly(x, 1, 2, 3)
 
 Out[49]:
 
-```
+```py
 6
 ```
 
@@ -854,7 +854,7 @@ Out[49]:
 
 In [50]:
 
-```
+```py
 x = array([1, 2, 3])
 poly(x, 1, 2, 3)
 
@@ -862,7 +862,7 @@ poly(x, 1, 2, 3)
 
 Out[50]:
 
-```
+```py
 array([ 6, 11, 18])
 ```
 
@@ -870,7 +870,7 @@ array([ 6, 11, 18])
 
 In [51]:
 
-```
+```py
 from numpy import arange
 
 def poly(x, a = 1, b = 2, c = 3):
@@ -885,33 +885,33 @@ array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
 
 Out[51]:
 
-```
+```py
 array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
 ```
 
 In [52]:
 
-```
+```py
 poly(x)
 
 ```
 
 Out[52]:
 
-```
+```py
 array([  3,   6,  11,  18,  27,  38,  51,  66,  83, 102])
 ```
 
 In [53]:
 
-```
+```py
 poly(x, b = 1)
 
 ```
 
 Out[53]:
 
-```
+```py
 array([ 3,  5,  9, 15, 23, 33, 45, 59, 75, 93])
 ```
 
@@ -921,7 +921,7 @@ Python中使用`import`关键词来导入模块。
 
 In [54]:
 
-```
+```py
 import os
 
 ```
@@ -930,14 +930,14 @@ import os
 
 In [55]:
 
-```
+```py
 os.getpid()
 
 ```
 
 Out[55]:
 
-```
+```py
 4400
 ```
 
@@ -945,14 +945,14 @@ Out[55]:
 
 In [56]:
 
-```
+```py
 os.sep
 
 ```
 
 Out[56]:
 
-```
+```py
 '\\'
 ```
 
@@ -962,7 +962,7 @@ Out[56]:
 
 In [57]:
 
-```
+```py
 class Person(object):
     def __init__(self, first, last, age):
         self.first = first
@@ -977,7 +977,7 @@ class Person(object):
 
 In [58]:
 
-```
+```py
 person = Person('Mertle', 'Sedgewick', 52)
 
 ```
@@ -986,14 +986,14 @@ person = Person('Mertle', 'Sedgewick', 52)
 
 In [59]:
 
-```
+```py
 person.first
 
 ```
 
 Out[59]:
 
-```
+```py
 'Mertle'
 ```
 
@@ -1001,14 +1001,14 @@ Out[59]:
 
 In [60]:
 
-```
+```py
 person.full_name()
 
 ```
 
 Out[60]:
 
-```
+```py
 'Mertle Sedgewick'
 ```
 
@@ -1016,7 +1016,7 @@ Out[60]:
 
 In [61]:
 
-```
+```py
 person.last = 'Smith'
 
 ```
@@ -1025,7 +1025,7 @@ person.last = 'Smith'
 
 In [62]:
 
-```
+```py
 person.critters = d
 person.critters
 
@@ -1033,7 +1033,7 @@ person.critters
 
 Out[62]:
 
-```
+```py
 {'cats': 4, 'dogs': 2, 'pigs': 7}
 ```
 
@@ -1041,7 +1041,7 @@ Out[62]:
 
 In [63]:
 
-```
+```py
 url = 'http://ichart.finance.yahoo.com/table.csv?s=GE&d=10&e=5&f=2013&g=d&a=0&b=2&c=1962&ignore=.csv'
 
 ```
@@ -1050,7 +1050,7 @@ url = 'http://ichart.finance.yahoo.com/table.csv?s=GE&d=10&e=5&f=2013&g=d&a=0&b=
 
 In [64]:
 
-```
+```py
 import urllib2
 ge_csv = urllib2.urlopen(url)
 data = []
@@ -1062,7 +1062,7 @@ data[:4]
 
 Out[64]:
 
-```
+```py
 [['Date', 'Open', 'High', 'Low', 'Close', 'Volume', 'Adj Close\n'],
  ['2013-11-05', '26.32', '26.52', '26.26', '26.42', '24897500', '24.872115\n'],
  ['2013-11-04',
@@ -1085,7 +1085,7 @@ Out[64]:
 
 In [65]:
 
-```
+```py
 ge_csv = urllib2.urlopen(url)
 import pandas
 ge = pandas.read_csv(ge_csv, index_col=0, parse_dates=True)
@@ -1095,7 +1095,7 @@ ge.plot(y='Adj Close')
 
 Out[65]:
 
-```
+```py
 <matplotlib.axes._subplots.AxesSubplot at 0xc2e3198>
 ```