name_list = list(['alex','seven','eric']) 二、基本操作: 索引 name_list = ["eirc","morra","tommy"]print(name_list[0])#eircprint(name_list[2])#'tommy'print(name_list[-1])#'tommy'print(name_list[-2])#'morra'print(name_list[1:])#['morra', 'tommy']print(name_list.index(...
-> integer -- return first index of value. Raises ValueError if the value is not present."""return0definsert(self, index, p_object):#real signature unknown; restored from __doc__"""在指定索引处插入元素"""L.insert(index, object) -- insert object before index"""passdefpop(self, index...
1、print:打印/输出 2、coding:编码 3、syntax:语法 4、error:错误 5、invalid:无效 6、identifier:名称/标识符 7、character :字符 二、字符串的操作 1、user:用户 2、name:姓名/名称 3、attribute:字段/属性 4、value:值 5、key:键 三、重复/转换/替换/原始字符串 1、upper:上面 2、lower:下面 3、ca...
Next, we will use np.array() function to convert the list of floats to integer.int_list = np.array(float_list).astype(int).tolist() print(int_list) # [1, 3, 5]In the astype() function, we specified that we wanted it to be converted to integers, and then we chained the to...
jinlist_1:sht_3[int(i),int(j)].color=(255,25,0)f()list_1=[]foriinrange(30):forjin...
def__init__(self,galleons,sickles,knuts):"""Create a new WizCoin object with galleons, sickles, and knuts."""self.galleons=galleons self.sickles=sickles self.knuts=knuts #NOTE:__init__()methodsNEVERhave areturnstatement. 当wcexample1.py程序调用WizCoin(2, 5, 99)时,Python 创建一个新...
(" "))): schema = schema.add(f"word_{index}", IntegerType())returnAnalyzeResult(schema=schema)defeval(self, text: str):counts = {}forwordintext.split(" "):ifwordnotincounts: counts[word] =0counts[word] +=1result = []forwordinsorted(list(set(text.split(" "))): result.append...
Python的json模块提供了处理JSON数据的工具,包括序列化(将Python对象转换为JSON字符串)和反序列化(将JSON字符串转换为Python对象)功能。 1.3 基本函数和方法 json.dumps(obj, indent=4): 将Python对象序列化为JSON格式的字符串,可选参数indent用于指定缩进空格数。
>>> query = """CREATE TABLE test (a VARCHAR(20), b VARCHAR(20), c REAL, d INTEGER);""" >>> con = sqlite3.connect(":memory:") >>> con.execute(query) <sqlite3.Cursor object at 0x000002E90067CFC0> >>> con.commit() 【PS:笔者来讲讲上述code都是啥意思哈】 接着,使用SQ...
importsqlite3# 连接数据库conn=sqlite3.connect('students.db')c=conn.cursor()# 创建students表c.execute('''CREATE TABLE students (id INTEGER PRIMARY KEY, name TEXT, math_score INTEGER)''')# 插入测试数据c.execute("INSERT INTO students (name, math_score) VALUES ('Tom', 90)")c.execute("...