reversed(iterable) - 创建一个迭代器可以反向遍历iterable list(iterable) - 创建一个list,得到iterable中的所有元素 tuple(iterable) - 创建一个tuple,包含iterable中的所有元素 sorted(iterable) - 创建一个排好序的list,包含iterable中的所有元素 Generators 生成器 一个生成器函数返回一个特殊的迭代器类型,叫做生...
list_example = [1, 2, 2, 3, 3, 3] print(set(list_example)) # {1, 2, 3} str_example = "banana" print(set(str_example)) # {'a', 'b', 'n'} dict() - 创建字典 dict() 函数可以从键值对序列创建字典。 list_of_tuples = [("name", "Alice"), ("age", 25)] print(dict...
deftrap(s,k):"""Return a generator that yields the first K values in iterable S,but raises a ValueError exception if any more values are requested.>>> t = trap([3, 2, 1], 2)>>> next(t)3>>> next(t)2>>> next(t)ValueError>>> list(trap(range(5), 5))ValueError>>> t2 =...
这是help(sum)的文本: >>>help(sum)sum(iterable,/,start=0)Return the sumofa'start'value(default:0)plus an iterableofnumbers When the iterable is empty,returnthe start value.Thisfunctionis intended specificallyforusewithnumeric values and may reject non-numeric types. 复制 内置函数sum是用 C 编...
If you’ve called it with arguments, then _func will be None, and some of the keyword arguments may have been changed from their default values. The asterisk in the argument list means that you can’t call the remaining arguments as positional arguments. Line 6: In this case, you called...
#counter variable to count unique values count = 0 # travesing the array for ele in input_list: if(ele not in empty_list): count += 1 empty_list.append(ele) #output print("Count of unique values are:", count) Count of unique values are: 5 ...
list_loop_while.py #!/usr/bin/python vals = [1, 2, 3, 4, 5, 6, 7] n = len(vals) i = 0 mysum = 0 while i < n: mysum += vals[i] i += 1 print(f'The sum is {mysum}') The example calculate the sum of values in the list and prints it to the terminal. ...
It allows you to check whether an integer value is not in a collection of values: Python >>> 5 not in [2, 3, 5, 9, 7] False >>> 8 not in [2, 3, 5, 9, 7] True In the first example, you get False because 5 is in the target list. In the second example, you get...
Python基础主要总结Python常用内置函数;Python独有的语法特性、关键词nonlocal,global等;内置数据结构包括:列表(list), 字典(dict), 集合(set), 元组(tuple) 以及相关的高级模块collections中的Counter,namedtuple,defaultdict,heapq模块。目前共有90个小例子。
If there are more than 2 categories in terms of types of outcome, a multinomial logistic regression should be used Independence of observations Cannot be a repeated measures design, i.e. collecting outcomes at two different time points.