xrange是一个生成器,因此它是一个序列对象,是一个懒惰求值的对象。 的确如此,但是在 Python 3 中, range()将由Python 2 xrange() 。如果需要实际生成列表,则需要执行以下操作: list(range(1,100))记住,请使用timeit模块来测试哪个较小的代码片段更快! $ python -m timeit 'for i in range(100000...
What is the use of "assert" in Python? Should I put #! (shebang) in Python scripts, and what form should it take? What is the naming convention in Python for variable and function? What do __init__ and self do in Python? What is the difference between r...
The dict methods —dict.keys(),dict.items(), anddict.values. You will also note thatdict.iterkeys(),dict.iteritems(), anddict.itervalues()are no longer supported methods in Python. Bothmap()andfilter()return iterators instead of lists. Therange()method has replacedxrange()and is used in...
PEP3111:raw_input()改名为input(),也就是说,新的input()函数从标准输入设备(sys.stdin) 读取一行 并返回(不包括行结束符),如果输入过早终止,该函数抛出EOFError,如果想使用老的input(),可以使用eval(input())代替。 xrange()改名为range(),range()现在不是产生一个列表(list),而是一个迭代器。 PEP3113:...
map()andfilter()return iterators. range()behaves like xranges() but the latter no longer exists. zip()return iterators. 1.3 Ordering Comparisons The ordering comparison operators(<, <=, >=, >) raise a TypeError exception when the operands ...
xrange()改名为range(),range()现在不是产生一个列表(list),而是一个迭代器。 PEP3113:移除了"元组参数拆包(tuple parameter unpacking)"。这种写法已经不行了: def foo(a, (b, c)):... 现在要这样写: def foo(a, b_c): b,c = b_c
range() now behaves like xrange() used to behave, except it works with values of arbitrary size. The latter no longer exists. zip() now returns an iterator. Ordering Comparisons¶ Python 3.0 has simplified the rules for ordering comparisons: ...
Re: what's the python for this C statement? Lie Ryan wrote: (which might be the more typical case). And I think range will be an iterator in the future, imitating the behavior of xrange. So it doesn't really matter anyway. In 3.0, range is a class and range(arg) is a re-ite...
m=int(sqrt(n))foriinrange(2,m+1): k=0whilei**k <n: k+=1ifi**k==n:return[i,k]returnNone 解读:先对n进行开根号,得到最大的m值,然后根据逐步逼近的办法来确定k的值。很好理解,是个好办法。 看一下最多人推荐的: frommathimportceil, log, sqrtdefisPP(n):forbinxrange(2, int(sqrt(...