import os # 检查指定文件是否存在 if os.path.exists('file.txt'): print("File exists.") else: print("File does not exist.")数据处理 读取 CSV 文件 importcsv# 读取 CSV 文件并打印每一行 with open('data.csv', 'r') as file:
def check_element_in_set(s, elem): return elem in s my_set = {1, 2, 3, 4, 5} element_to_check = int(input("请输入一个元素来检查其是否在集合中: ")) if check_element_in_set(my_set, element_to_check): print(f"元素 {element_to_check} 在集合中。") else: print(f"元素 {...
deflogin(self):ifself.login_method==0:self.driver.get(login_url)# 载入登录界面print('###开始登录###')elif self.login_method==1:ifnot os.path.exists('cookies.pkl'):# 如果不存在cookie.pkl,就获取一下 self.set_cookie()else:self.driver.get(target_url)self.get_cookie() 打开浏览器 代码...
To do this, we start with the last bit and count from right to left, setting bits until all bits have been set. Now that we have all our addresses, we need to print the information. The problem is that we have arrays of integers, and we would have to cast each individual element ...
element_located_selection_state_to_be: 跟上面的方法作用一样,只是上面的方法传入定位到的element,而这个方法传入locator 检测document是否加载完成 另外还可以使用driver.execute_script('return document.readyState;') == 'complete'来检测document是否加载完成。
if self.login_method==0: self.driver.get(login_url) # 载入登录界面 print('###开始登录###') elif self.login_method==1: if not os.path.exists('cookies.pkl'): # 如果不存在cookie.pkl,就获取一下 self.set_cookie() else: self.driver.get(target_url) ...
my_set={1,2,3,4,5}forelementinmy_set:print(element) 1. 2. 3. 输出: 1 2 3 4 5 1. 2. 3. 4. 5. 方法2:将set转换为list 可以将set转换为list,并通过索引访问list中的元素。 my_set={1,2,3,4,5}my_list=list(my_set)print(my_list[0]) ...
defcheck_for_file():print("Does file exist:",path.exists("data.csv"))if__name__=="__main__":check_for_file() 输出: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Does file exist:False 5、检索列表最后一个元素 在使用列表的时候,有时会需要取最后一个元素,有下面几种方式可以实现。
>>> x = SomeClass() >>> y = x >>> del x >>> y # check if y exists <__main__.SomeClass instance at 0x7f98a1a67fc8> >>> del y # Like previously, this should print "Deleted!" >>> globals() # oh, it didn't. Let's check all our global variables and confirm Deleted...
() # 修改 for node in root.iter('year'): new_year = int(node.text) + 1 node.text = str(new_year) node.set("updated", "yes") tree.write("xmltest.xml") # 删除node for country in root.findall('country'): rank = int(country.find('rank').text) if rank > 50: root.remove...