#使用成员运算符my_list = [1, 2, 3, 4, 5]#判定元素是否存在element_to_check = 3ifelement_to_checkinmy_list:print(f"{element_to_check} 存在于列表中。")else:print(f"{element_to_check} 不存在于列表中。")#或者使用 not in 判定不存在element_to_check = 6ifelement_to_checknotinmy_li...
")else: print(f"{element_to_check} 不存在于列表中。")# 或者使用 not in 判定不存在element_to_check = 6if element_to_check not in my_list: print(f"{element_to_check} 不存在于列表中。")else: print(
defcount_elements(lst,condition):count=0# 步骤1:创建一个空的计数器变量forelementinlst:# 步骤2:遍历列表中的每一个元素ifcondition(element):# 步骤3:判断当前元素是否满足复合条件count+=1# 步骤4:如果满足条件,则将计数器加一returncount# 步骤6:返回计数器的值作为结果 1. 2. 3. 4. 5. 6. 7. ...
之前写过一篇python 列表寻找满足某个条件的开始索引和结束索引(python find the starting and ending indices of values that satisfy a certain condition in a list)的文章,因在实际项目中,这个算法的执行速度慢,于是我想使用 python 执行效果高的 numpy 来实现相同的功能,于是就研究了一会,出了一版本效果和上面...
def find_first_element(tuples, second_value): for first, second in tuples: if second == second_value: return first return None # Return None if the second value is not found # create the tuple list my_tuples = [("amar", 3), ("akbar", 2), ("anthony", 31)] second_value = ...
= rows[1].find_element_by_class_name("item_status").text 开发者ID:0905huhy,项目名称:nbgrader,代码行数:28,代码来源:test_assignment_list.py 示例2: test_plot ▲点赞 7▼ deftest_plot(self):wait = WebDriverWait(self.driver,10) wait.until(EC.invisibility_of_element_...
4foundinList:[1,2,3,4,5] Method 4: Using any() The any() function checks if any element in an iterable meets a specified condition. It returns True as soon as it finds an element that satisfies the condition; otherwise, it is False. ...
To find the index of the first occurrence of an element: index_of_air = elements.index('Air') 7. List Slicing To slice a list, obtaining a sub-list: # Get elements from index 1 to 3 sub_elements = elements[1:4] 8. List Comprehension To create a new list by applying an expressio...
This <Target> element defines a custom command to run the startup file for the project (identified by the StartupFile property) by using the python.exe command in a console window. The attribute definition ExecuteIn="consolepause" uses a console that waits for you to select a key to close...
if (‘Python’ in [‘Java', ‘Python’, ‘C#’]): print(“true”) Output: true Here, we are verifying if the element ‘Python’ is present in the given list or not. Hence it prints true because “ Python “ is present in the given list. ...