Last login: Tue Jan 13 09:55:58 on ttys000
odd% python
Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a=5
>>> a+=1
>>> a
6
>>> a++
  File "<stdin>", line 1
    a++
      ^
SyntaxError: invalid syntax
>>> a+=1
>>> a
7
>>> a*=2
>>> a
14
>>> a={1:2,2:3,3:4}
>>> a[2]
3
>>> a.get(2)
3
>>> b=[1,3,2,1,1]
>>> map(a.get,b)
[2, 4, 3, 2, 2]
>>> map(a.get(),b)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: get expected at least 1 arguments, got 0
>>> map(a.get(),b)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: get expected at least 1 arguments, got 0
>>> map(a.get,b)
[2, 4, 3, 2, 2]
>>> b=map(a.get,b)
>>> b
[2, 4, 3, 2, 2]
>>> map(a.get,b)
[3, None, 4, 3, 3]
>>> a=bytearray("abcdef")
>>> a
bytearray(b'abcdef')
>>> a[2]
99
>>> chr(99)
'c'
>>> chr(98)
'b'
>>> chr(66)
'B'
>>> ord("b")
98
>>> a
bytearray(b'abcdef')
>>> a[2]="Z"
>>> a
bytearray(b'abZdef')
>>> help(ord)

>>> def f(x):
...  "return x^2"
...  return x**2
... 
>>> f(3)
9
>>> help(f)

>>> import math
>>> help(math)

>>> help(math.cos)

>>> a=file("test.txt","w")
>>> a.write("alphabet\n")
>>> 
odd% cat test.txt 
alphabet
odd% python      
Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a=file("test.txt","w")
>>> a.write("testing 2 3")
>>> 
odd% cat test.txt
testing 2 3%                                                                              odd% python      
Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a=file("test.txt","a")
>>> a.write(" continuing\n")
>>> 
odd% cat test.txt 
testing 2 3 continuing
odd% python      
Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a=file("test.txt","r+")
>>> a.write("interesting")
>>> 
odd% cat test.txt 
interesting continuing
odd% python      
Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a=file("test.txt","r+")
>>> a.seek(5)
>>> a.write("xxx")
>>> 
odd% cat test.txt 
interxxxing continuing
odd% python      
Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a=file("test.txt","r+")
>>> a.write("xxx")
>>> a=file("test2.txt","r+")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory: 'test2.txt'
>>> a=file("test2.txt","w")
>>> 
odd% 
odd% vi x.txt
odd% python
Python 2.7.6 (default, Sep  9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a=file("x.txt","r")
>>> for l in a:
...  print l
... 
this is line1

line 2

line 3

line 4

>>> from math import *
>>> pi
3.141592653589793
>>> print pi
3.14159265359
>>> "{:1.3f}".format(pi)
'3.142'
>>> "{}
  File "<stdin>", line 1
    "{}
      ^
SyntaxError: EOL while scanning string literal
>>> "{}".format(pi)
'3.14159265359'
>>> "{} + {} = {}".format(1,2,3)
'1 + 2 = 3'
>>> "{} + {} = {}".format(1,2,5)
'1 + 2 = 5'
>>> "{:%}".format(.125)
'12.500000%'
>>> a=12356678.1234
>>> a
12356678.1234
>>> print "{:f}".format(a)
12356678.123400
>>> print "{:e}".format(a)
1.235668e+07
>>> print "{:g}".format(a)
1.23567e+07
>>> print "{:g}".format(1234)
1234
>>> print "{:8.2g}".format(1234)
 1.2e+03
>>> print "{:10.2g}".format(1234)
   1.2e+03
>>> print "{:-10.2g}".format(1234)
   1.2e+03
>>> print "{:<10.2g}".format(1234)
1.2e+03   
>>> print "{hello}".format(1234)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'hello'
>>> print "{hello}".format(hello=1234)
1234
>>> print "{v1} {v2} {v1}".format(v1=5,v2=10)
5 10 5
>>> 
odd%