:param input_string: 需要检查的字符串 :param string_list: 字符串列表 :return: 如果存在,返回True,否则返回False """returninput_stringinstring_list# 示例用法my_strings=["hello","world","python","programming"]test_string="python"if
list是最常见的可迭代对象,其他可迭代的对象例如 dict,set,file lines,string等 for i in set((1,2,3)): print(i) 输出:123 import string list_num = list(string.digits) for i in list_num: # 输出偶数 if int(i)%2 == 0: print(i) 输出:02468 range range 有头无尾,e.g. range(1,3)...
attempts +=1iflucky >=0: lucky -=1print(f"目前用了{attempts}次尝试。")ifguess < secret_number:print("小了")elifguess > secret_number:print("大了")else:print(f"猜对了!")print(f"你的幸运值是:{lucky}")returnluckyexceptValueError:print("请输入有效的整数!")` ②测试反应力 `def react...
The Pythonlen()is used to get the total number of characters present in the string and check if the length of the string is 0 to identify the string is empty. Actually, thelen()function returns the length of an object. The object can be a string, a list, a tuple, or other objects ...
is_active = True # 布尔型 no_value = None # NoneType1.1.2 复合数据类型 复合数据类型则能够组合多个值形成更复杂的数据结构。主要包括列表(list)、元组(tuple)、字典(dict)和集合(set): •列表:有序且可变的元素序列,例如students = ["Alice", "Bob", "Charlie"]。
So for example, if I type S, minus 3, Python will give me the last three characters in that sequence,in that string, which are h, o, and n. 我还可以使用字符串测试成员资格。 I can also test for memberships using the strings. 例如,假设我想问,字符y是我字符串的一部分吗? For example...
print list01[-1] print list01[0:3] # 列表重复 print list01 * 2 # 列表组合 print list01 + list02 # 获取列表长度 print len(list01) # 删除列表元素 del list02[0] print list02 # 元素是否存在于列表中 print 'john' in list02 # True ...
Python String is a sequence of characters. We can convert it to the list of characters using list() built-in function. When converting a string to list of characters, whitespaces are also treated as characters. Also, if there are leading and trailing whitespaces, they are part of the list...
importnumpyasnpdeftest(a):a[0]=np.nanm=[1,2,3]test(m)print(m) output: [nan, 2, 3] Note python has this really weird error if you define local variable in a function same name as the global variable, program will promptUnboundLocalError. ...
Python 的collections模块提供了标准内建数据类型(如dict,list,set,tuple)之外的替代容器数据类型。这些特殊化的容器在特定场景下可以提供更优的性能、更简洁的代码或更方便的功能。 2.5collections.defaultdict:带默认值的字典 defaultdict是dict的一个子类,它重写了一个方法并添加了一个可写的实例变量。其核心特性是:...