for char in len(string): if (char % 2 != 0): new_string = new_string + string[char].upper() else: new_string = new_string + string[char] print(f"After alternating case changes : {new_string}") 当我们尝试在终端中运行它时,我们会遇到错误:'int' object is not iterable。 输出: P...
iterable = MyIterable(range(5)) for i in iterable: print(i) 1. 2. 3. 输出与之前一致. 可以看出,iterable对象在被迭代前已经被iter(iterable)包装成iterator, 只不过iter方法是由Python解释器替我们调用的. iterator会保存访问状态 上面已经说过,iterator是有状态的, 这儿再通过一个例子更具体的说明它的状态...
上面出现了两个可迭代对象 (iterable),不严谨地说,容器类型数据 (str, tuple, list, dict, set) 都是可迭代对象。 第一个可迭代对象:可以是任何容器类型数据。 第二个可迭代对象:看是什么类型解析式: 列表解析式:可迭代对象是list 字典解析式:可迭代对象是dict 集合解析式:可迭代对象是set 下面写出列表、...
>>> min(1) # 传入1个参数报错 Traceback (most recent call last): File "<pyshell#0>", line 1, in <module> min(1) TypeError: 'int' object is not iterable >>> min(1,2) # 传入2个参数 取2个中较小者 1 >>> min(1,2,3) # 传入3个参数 取3个中较小者 1 >>> min('1234'...
queue.extendleft([1, 2, 3]) # extend left by an iterable Collection unpacking a,b,c = (1, 2, 3) width, heigh = 1, 2 width, height = height, width Comprehensions x = [i*j for i in range(100) for j in range(10)]
string 对象的 split() 方法只适应于非常简单的字符串分割情形,它并不允许有多个分隔符或者是分隔符周围不确定的空格。当你需要更加灵活的切割字符串的时候,最好使用re.split()方法: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>>line='asdf fjdk; afed, fjek,asdf, foo'>>>importre>>>re.spli...
If iterable is not specified, the new deque is empty. pop() Remove and return an element from the right side of the deque. If no elements are present, raises an IndexError. popleft() Remove and return an element from the left side of the deque. If no elements are present, raises...
()`` method, such asa file handle (e.g. via builtin ``open`` function) or ``StringIO``.sep : str, default ','Delimiter to use. If sep is None, the C engine cannot automatically detectthe separator, but the Python parsing engine can, meaning the latter willbe used and ...
def all(iterable): for element in iterable: if not element: return False return True all([]) returns True since the iterable is empty. all([[]]) returns False because the passed array has one element, [], and in python, an empty list is falsy. all([[[]]]) and higher recursive ...
To iterate over a plain Python iterable, use the python.iter() function. For example, you can manually copy a Python list into a Lua table like this: >>> lua_copy = lua.eval(''' ... function(L) ... local t, i = {}, 1 ... for item in python.iter(L) do ... t[i] ...