msg['From']=self.from_addr msg['To']=self.to_addrwithsmtplib.SMTP(self.mailhost)asserver:server.sendmail(self.from_addr,[self.to_addr],msg.as_string())# 配置邮件处理程序 mail_handler=EmailHandler(mailhost='smtp.exampl
The format() function takes a value and a format specifier as arguments. Then, it applies the specifier to the value to return a formatted value. The format specifier must follow the rules of the string formatting mini-language.Just like the .format() method, f-strings also support the ...
l=[1,2,2]l.insert(1,100)print l #[1,100,2,2]l.insert(100,1000)print l #[1,100,2,2,1000]pop([i])---返回i位置项,并从列表中删除;如果不提供参数,则删除最后一个项;如果提供,但是i超出索引范围,则异常IndexError l=[0,1,2,3,4,5...
3.步长(可以省略,默认为1)(步长不能为0,为0会抛异常,可以为负数,会倒序输出) 通过range()可以创建一个执行指定次数的for循环: 例如: for i in range(5) print(i,end = ‘’) 1. 2. 运行截图: for i in range(10, 20, 2): print(i, end=' ') 1. 2. 运行截图: for i in range(18, 8...
x = (i for i in range(10)) Iterator Iterator is like range(11), compare to list = [0,1,...,10] all data is stored in memory. Iterator only generates values from looping through the object. # to get iterator from range function ...
writer.writerow([website_name, encrypted_password.decode()])# Ensure storing string representation # Function to retrieve password from CSV file defretrieve_password(website_name): withopen('credentials.csv','r')ascsvfile: reader = csv.reader(csv...
从某个模块中导入某个函数,格式为: from somemodule import somefunction 从某个模块中导入多个函数,格式为: from somemodule import firstfunc, secondfunc, thirdfunc 将某个模块中的全部函数导入,格式为: from somemodule import * 比如: import random # 引入随机数 x = random.randint(0, 2) # 随机生成...
insert – insert a row into a database table Y - update – update a row in a database table Y - upsert – insert a row with conflict resolution Y - query – execute a SQL command string Y - query_formatted – execute a formatted SQL command string Y - query_prepared – execute a...
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Use the string methodupper()to convert a value into upper case letters: fruit ="apples" txt = f"I love {fruit.upper()}" print(txt) Try it Yourself » The function does not have to be a built-in Python method, you can create your own functions and use them: ...