简明Python教程学习笔记1

 1 >>> help("help")
 2 
 3 Welcome to Python 2.7!  This is the online help utility.
 4 
 5 If this is your first time using Python, you should definitely check out
 6 the tutorial on the Internet at http://docs.python.org/2.7/tutorial/.
 7 
 8 Enter the name of any module, keyword, or topic to get help on writing
 9 Python programs and using Python modules.  To quit this help utility and
10 return to the interpreter, just type "quit".
11 
12 To get a list of available modules, keywords, or topics, type "modules",
13 "keywords", or "topics".  Each module also comes with a one-line summary
14 of what it does; to list the modules whose summaries contain a given word
15 such as "spam", type "modules spam".
16 
17 >>> 
18 >>> 

 1 >>> help("math")
 2 Help on built-in module math:
 3 
 4 NAME
 5     math
 6 
 7 FILE
 8     (built-in)
 9 
10 DESCRIPTION
11     This module is always available.  It provides access to the
12     mathematical functions defined by the C standard.
13 
14 FUNCTIONS
15     acos(...)
16         acos(x)
17         

1 >>> help("str")
2 Help on class str in module __builtin__:
3 
4 class str(basestring)
5  |  str(object=‘‘) -> string
6  |  
7  |  Return a nice string representation of the object.

 1 >>> help("str.split")
 2 Help on method_descriptor in str:
 3 
 4 str.split = split(...)
 5     S.split([sep [,maxsplit]]) -> list of strings
 6     
 7     Return a list of the words in the string S, using sep as the
 8     delimiter string.  If maxsplit is given, at most maxsplit
 9     splits are done. If sep is not specified or is None, any
10     whitespace string is a separator and empty strings are removed
11     from the result.
12 
13 >>> 

1 >>> #\‘转义为‘
2 >>> print ‘What\‘s your name‘
3 What‘s your name
4 >>> #\n转义为换行
5 >>> print ‘First line\nSecond line‘
6 First line
7 Second line
8 >>> 
9 >>> 

1 >>> #\n转义为换行
2 >>> print ‘First line\nSecond line‘
3 First line
4 Second line
5 >>> #\n不执行转义
6 >>> print r‘First line\nSecond line‘
7 First line\nSecond line
8 >>> 

1 >>> str1 = u‘Unicode String‘
2 >>> print type(str1)
3 <type ‘unicode‘>
4 >>> print str1
5 Unicode String