python中iterable和iterator(补充enumerate函数) iterable:可迭代对象 可以一个一个的返回它的成员,比如list,str,tuple,dict,file objects 它可以在for loop种使用,for loop in后面接的必须是一个可迭代对象 iterator:迭代器 是一个表示数据流的对象,可以使用next函数不断的从这个对象里面获取新的数据 前者是一个数据...
四、 枚举:enumerate 对于一个可迭代的(iterable)/可遍历的对象(如列表、字符串),enumerate将其组成一个索引序列,利用它可以同时获得索引和值 1li = ['唐僧','孙悟空','沙和尚','猪八戒']2foriinenumerate(li):3print(i)#输出结果为四个新的列表45fori, nameinenumerate(li, 0):#起始位置默认是0,可...
问Pythonic: python for循环中的range vs enumerateEN元祖又叫做只读列表，可循环查询、可切片，元祖里的...
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python enumerate函数用法 enumerateis a built-in function of Python. It allows us to loop over something and have an automatic counter. forcounter,valueinenumerate(some_list):print(counter,value) enumeratealso accepts an optional argument,The optional argument allows us to tellenumeratefrom where to...
Python 中的 Enumerate enumerate 是一个会返回元组迭代器的内置函数,这些元组包含列表的索引和值。当你需要在循环中获取可迭代对象的每个元素及其索引时,将经常用到该函数。 示例代码: letters = ['a','b','c','d','e']fori, letterinenumerate(letters):print(i, letter) ...
'for i in range(1,len(a))的缩写:'在python中 在python中,有一种简短的写作方式for i in range(len(l)):吗? 我知道我可以使用for i,_ in enumerate(l):,但我想知道是否有另一种方式(没有_). 请不要说for v in l因为我需要索引(例如比较连续值l[i]==l[i+1])....
Python: Find the longest word in a string I'm preparing for an exam but I'm having difficulties with one past-paper question. Given a string containing a sentence, I want to find the longest word in that sentence and return that word and its ... ...
Presenting a more general solution to the loop counter problem "because sometimes you don't want to start counting from zero": for checknum, check in enumerate(lastchecknum, checks): printdraft(check, checknum) myfile = open(myfilename) for lineno, line in enumerate(myfile): print '...
The for loop unpacks each pair into index and fruit, which we then use in the print statement. enumerate also takes an optional second argument, which is the start index. By default, it starts at 0, but you can change this if needed: python fruits = ['apple', 'banana', 'cherry']...