【導(dǎo)讀】中文譯文和用法尚不完全，您可以自由修改和完善，如果你不知道絕對值什么意思，那就要補(bǔ)一下小學(xué)數(shù)學(xué)了！是字符串和字符編碼的超類，是抽象類型。不能被調(diào)用或者實(shí)例化?？梢杂脕砼袛鄬?shí)例是否。為字符串或者字符編碼。

　　

【正文】 alue x rounded to n digits after the decimal point. If n is omitted, it defaults to zero. The result is a floating point number. Values are rounded to the closest multiple of 10 to the power minus n。 if two multiples are equally close, rounding is done away from 0 (so. for example, round() is and round() is ). ，但是不改變原始數(shù)據(jù) set([iterable]) Return a new set, optionally with elements taken from iterable. The set type is described in Set Types — set, frozenset. 62. setattr(object, name, value) This is the counterpart of getattr(). The arguments are an object, a string and an arbitrary value. The string may name an existing attribute or a new attribute. The function assigns the value to the attribute, provided the object allows it. For example, setattr(x, 39。foobar39。, 123) is equivalent to = 123. 起始位置，終止位置，步長 slice([start], stop[, step]) Return a slice object representing the set of indices specified by range(start, stop, step). The start and step arguments default to None. Slice objects have readonly data attributes start, stop and step which merely return the argument values (or their default). They have no other explicit functionality。 however they are used by Numerical Python and other third party extensions. Slice objects are also generated when extended indexing syntax is used. For example: a[start:stop:step] or a[start:stop, i]. See () for an alternate version that returns an iterator. 用法 sorted(iterable[, cmp[, key[, reverse]]]) Return a new sorted list from the items in iterable. 用法 調(diào)用類方法的一種函數(shù) staticmethod(function) Return a static method for function. str([object]) Return a string containing a nicely printable representation of an object. For strings, this returns the string itself. The difference with repr(object) is that str(object) does not always attempt to return a string that is acceptable to eval()。 its goal is to return a printable string. If no argument is given, returns the empty string, 39。39。. sum(iterable[, start]) Sums start and the items of an iterable from left to right and returns the total. start defaults to 0. The iterable‘s items are normally numbers, and the start value is not allowed to be a string. 68. super(type[, objectortype]) Return a proxy object that delegates method calls to a parent or sibling class of type. This is useful for accessing inherited methods that have been overridden in a class. The search order is same as that used by getattr() except that the type itself is skipped. tuple([iterable]) Return a tuple whose items are the same and in the same order as iterable‘s items. iterable may be a sequence, a container that supports iteration, or an iterator object. If iterable is already a tuple, it is returned unchanged. For instance, tuple(39。abc39。) returns (39。a39。, 39。b39。, 39。c39。) and tuple([1, 2, 3]) returns (1, 2, 3). If no argument is given, returns a new empty tuple, (). type(object) Return the type of an object. The return value is a type object. The isinstance() builtin function is remended for testing the type of an object. 用法： 71. unichr(i) Return the Unicode string of one character whose Unicode code is the integer i. For example, unichr(97) returns the string u39。a39。. This is the inverse of ord() for Unicode strings. The valid range for the argument depends how Python was configured – it may be either UCS2 [0..0xFFFF] or UCS4 [0..0x10FFFF]. ValueError is raised otherwise. For ASCII and 8bit strings see chr(). 72. unicode([object[, encoding[, errors]]]) Return the Unicode string version of object using one of the following modes: 73. vars([object]) Without an argument, act like locals(). 74． xrange([start], stop[, step]) This function is very similar to range(), but returns an “xrange object” instead of a list. This is an opaque sequence type which yields the same values as the corresponding list, without actually storing them all simultaneously. The advantage of xrange() over range() is minimal (since xrange() still has to create the values when asked for them) except when a very large range is used on a memorystarved machine or when all of the range’s elements are never used (such as when the loop is usually terminated with break). 75. zip([iterable, ...]) 76. __import__(name[, globals[, locals[, fromlist[, level]]]]) Note This is an advanced function that is not needed in everyday Python programming. This function is invoked by the import statement. It can be replaced (by importing the __builtin__ module and assigning to ) in order to change semantics of the import statement, but nowadays it is usually simpler to use import hooks (see PEP 302). Direct use of __import__() is rare, except in cases where you want to import a module whose name is only known at runtime. 鳴謝： 發(fā)起者：下一站火星 ： 492266686 Email: