python-2.x

I tried a bit of code but it seems to cause issues: class Page: cache = [] """ Return cached object """ def __getCache(self, title): for o in Page.cache: if o.__searchTerm == title or o.title == title: return o return None """ Initilize the class and start processing """ def __init__(self, title, api=None): o = self.__getCache(title) if o: self = o return Page.cache.append(self) # Other init code self.__searchTerm = title self.title = self.someFunction(title) Then I try: a = Page('test') b = Page('test') print a.title # works print b.title # AttributeError: Page instance has no attribute

Python 2.6.5 (r265:79063, Oct 1 2012, 22:07:21) [GCC 4.4.3] >>> class myclass: ... def func(self): ... pass >>> dd = myclass.func >>> ee = myclass.func >>> cc = myclass.func >>> ff = myclass.func >>> ss = myclass.func >>> uu = myclass.func >>> pp = myclass.func >>> >>> >>> id(dd) ; id(cc) ; id(ee) ; id(ff) ; id(ss) ; id(uu) ; id(pp) 3074535252L 3074534772L 3074522444L 3074531732L 3074497588L 3073003604L 3073003724L Why is the ID of the unbound method different each time? Shouldn't it be same ? This is because the methods on a class (old or new) work really like attributes with the descriptor _

>>> class Hello: pass and >>> isinstance(Hello,object) True >>> issubclass(Hello,object) False >>> a = Hello() >>> isinstance(a,object) True How do you explain isinstance(Hello,object) returns True whilst issubclass(Hello,object) returns False It's because you are using old-style classes so it doesn't derive from object . Try this instead: class Hello(object): pass >>> issubclass(Hello,object) True Old-style classes are deprecated and you shouldn't use them any more. In Python 3.x all classes are new-style and writing (object) is no longer required. The accepted answer is correct, but seems to

How can I make a BufferedReader object from a standard file object, like sys.stdin or what you get from 'open'? (Background: I need a peek() method, which the standard file objects fail at having. Any suggestions to solve this issue are also welcome.) I'd have sort of expected this to work, but it doesn't: >>> import sys >>> import io >>> io.BufferedReader(sys.stdin) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'file' object has no attribute 'readable' (This is Python 2.7) Hah, got it, at least for anything that has a file descriptor. stream = sys

In the "string" module of the standard library, string.ascii_letters ## Same as string.ascii_lowercase + string.ascii_uppercase is 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' Is there a similar constant which would include everything that is considered a letter in unicode? You can construct your own constant of Unicode upper and lower case letters with: import unicodedata as ud all_unicode = ''.join(unichr(i) for i in xrange(65536)) unicode_letters = ''.join(c for c in all_unicode if ud.category(c)=='Lu' or ud.category(c)=='Ll') This makes a string 2153 characters long (narrow

I am working in Python 2 and I have a string containing emojis as well as other unicode characters. I need to convert it to a list where each entry in the list is a single character/emoji. x = u'😘😘xyz😊😊' char_list = [c for c in x] The desired output is: ['😘', '😘', 'x', 'y', 'z', '😊', '😊'] The actual output is: [u'\ud83d', u'\ude18', u'\ud83d', u'\ude18', u'x', u'y', u'z', u'\ud83d', u'\ude0a', u'\ud83d', u'\ude0a'] How can I achieve the desired output? ivan_pozdeev First of all, in Python2, you need to use Unicode strings ( u'<...>' ) for Unicode characters to be seen as Unicode characters.