1 Last login: Tue Jan 13 09:55:58 on ttys000
   2 odd% python
   3 Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
   4 [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
   5 Type "help", "copyright", "credits" or "license" for more information.
   6 >>> a=5
   7 >>> a+=1
   8 >>> a
   9 6
  10 >>> a++
  11   File "<stdin>", line 1
  12     a++
  13       ^
  14 SyntaxError: invalid syntax
  15 >>> a+=1
  16 >>> a
  17 7
  18 >>> a*=2
  19 >>> a
  20 14
  21 >>> a={1:2,2:3,3:4}
  22 >>> a[2]
  23 3
  24 >>> a.get(2)
  25 3
  26 >>> b=[1,3,2,1,1]
  27 >>> map(a.get,b)
  28 [2, 4, 3, 2, 2]
  29 >>> map(a.get(),b)
  30 Traceback (most recent call last):
  31   File "<stdin>", line 1, in <module>
  32 TypeError: get expected at least 1 arguments, got 0
  33 >>> map(a.get(),b)
  34 Traceback (most recent call last):
  35   File "<stdin>", line 1, in <module>
  36 TypeError: get expected at least 1 arguments, got 0
  37 >>> map(a.get,b)
  38 [2, 4, 3, 2, 2]
  39 >>> b=map(a.get,b)
  40 >>> b
  41 [2, 4, 3, 2, 2]
  42 >>> map(a.get,b)
  43 [3, None, 4, 3, 3]
  44 >>> a=bytearray("abcdef")
  45 >>> a
  46 bytearray(b'abcdef')
  47 >>> a[2]
  48 99
  49 >>> chr(99)
  50 'c'
  51 >>> chr(98)
  52 'b'
  53 >>> chr(66)
  54 'B'
  55 >>> ord("b")
  56 98
  57 >>> a
  58 bytearray(b'abcdef')
  59 >>> a[2]="Z"
  60 >>> a
  61 bytearray(b'abZdef')
  62 >>> help(ord)
  63 
  64 >>> def f(x):
  65 ...  "return x^2"
  66 ...  return x**2
  67 ... 
  68 >>> f(3)
  69 9
  70 >>> help(f)
  71 
  72 >>> import math
  73 >>> help(math)
  74 
  75 >>> help(math.cos)
  76 
  77 >>> a=file("test.txt","w")
  78 >>> a.write("alphabet\n")
  79 >>> 
  80 odd% cat test.txt 
  81 alphabet
  82 odd% python      
  83 Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
  84 [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
  85 Type "help", "copyright", "credits" or "license" for more information.
  86 >>> a=file("test.txt","w")
  87 >>> a.write("testing 2 3")
  88 >>> 
  89 odd% cat test.txt
  90 testing 2 3%                                                                              odd% python      
  91 Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
  92 [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
  93 Type "help", "copyright", "credits" or "license" for more information.
  94 >>> a=file("test.txt","a")
  95 >>> a.write(" continuing\n")
  96 >>> 
  97 odd% cat test.txt 
  98 testing 2 3 continuing
  99 odd% python      
 100 Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
 101 [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
 102 Type "help", "copyright", "credits" or "license" for more information.
 103 >>> a=file("test.txt","r+")
 104 >>> a.write("interesting")
 105 >>> 
 106 odd% cat test.txt 
 107 interesting continuing
 108 odd% python      
 109 Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
 110 [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
 111 Type "help", "copyright", "credits" or "license" for more information.
 112 >>> a=file("test.txt","r+")
 113 >>> a.seek(5)
 114 >>> a.write("xxx")
 115 >>> 
 116 odd% cat test.txt 
 117 interxxxing continuing
 118 odd% python      
 119 Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
 120 [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
 121 Type "help", "copyright", "credits" or "license" for more information.
 122 >>> a=file("test.txt","r+")
 123 >>> a.write("xxx")
 124 >>> a=file("test2.txt","r+")
 125 Traceback (most recent call last):
 126   File "<stdin>", line 1, in <module>
 127 IOError: [Errno 2] No such file or directory: 'test2.txt'
 128 >>> a=file("test2.txt","w")
 129 >>> 
 130 odd% 
 131 odd% vi x.txt
 132 odd% python
 133 Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
 134 [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
 135 Type "help", "copyright", "credits" or "license" for more information.
 136 >>> a=file("x.txt","r")
 137 >>> for l in a:
 138 ...  print l
 139 ... 
 140 this is line1
 141 
 142 line 2
 143 
 144 line 3
 145 
 146 line 4
 147 
 148 >>> from math import *
 149 >>> pi
 150 3.141592653589793
 151 >>> print pi
 152 3.14159265359
 153 >>> "{:1.3f}".format(pi)
 154 '3.142'
 155 >>> "{}
 156   File "<stdin>", line 1
 157     "{}
 158       ^
 159 SyntaxError: EOL while scanning string literal
 160 >>> "{}".format(pi)
 161 '3.14159265359'
 162 >>> "{} + {} = {}".format(1,2,3)
 163 '1 + 2 = 3'
 164 >>> "{} + {} = {}".format(1,2,5)
 165 '1 + 2 = 5'
 166 >>> "{:%}".format(.125)
 167 '12.500000%'
 168 >>> a=12356678.1234
 169 >>> a
 170 12356678.1234
 171 >>> print "{:f}".format(a)
 172 12356678.123400
 173 >>> print "{:e}".format(a)
 174 1.235668e+07
 175 >>> print "{:g}".format(a)
 176 1.23567e+07
 177 >>> print "{:g}".format(1234)
 178 1234
 179 >>> print "{:8.2g}".format(1234)
 180  1.2e+03
 181 >>> print "{:10.2g}".format(1234)
 182    1.2e+03
 183 >>> print "{:-10.2g}".format(1234)
 184    1.2e+03
 185 >>> print "{:<10.2g}".format(1234)
 186 1.2e+03   
 187 >>> print "{hello}".format(1234)
 188 Traceback (most recent call last):
 189   File "<stdin>", line 1, in <module>
 190 KeyError: 'hello'
 191 >>> print "{hello}".format(hello=1234)
 192 1234
 193 >>> print "{v1} {v2} {v1}".format(v1=5,v2=10)
 194 5 10 5
 195 >>> 
 196 odd%