format() 和f-string:适合拼接带变量的字符串,性能接近 join() 方法,且代码更具可读性。 % 操作符:是一种老式的格式化方法,性能一般,代码的可读性较低。 性能测试 代码语言:javascript 代码运行次数:0 运行 AI代码解释 import time # 使用 + 拼接字符串 start = time.time() result = "" for i in rang...
In the rest of the examples, you create other variables that point to other types of objects, such as a string, tuple, and list, respectively. You’ll use the assignment operator in many of the examples that you’ll write throughout this tutorial. More importantly, you’ll use this opera...
使用元组、字典和lambda# Python program to demonstrate ternary operatora,b=10,20# Use tuple for s...
In fact, the ?: operator is commonly called the ternary operator in those languages, which is probably the reason Python’s conditional expression is sometimes referred to as the Python ternary operator. You can see in PEP 308 that the <conditional_expr> ? <expr1> : <expr2> syntax was ...
# You can basically put any Python statement inside the braces and it will be output in the string. f" is characters long." # => "Reiko is 5 characters long." 最后是None的判断,在Python当中None也是一个对象,所有为None的变量都会指向这个对象。根据我们前面所说的,既然所有的None都指向同一个地...
To compare a string with an enum, extend from thestrclass when declaring your enumeration class, e.g.class Color(str, Enum):. You will then be able to compare a string to an enum member using the equality operator==. How to compare a string with an Enum in Python | bobbyhadz ...
F:\python_work\Python基础\运算符>python ternary_operator.py crazyit (None, 'a 大于 b') 1. 2. 3. 上面程序中,True_statements 为 print("crazyit"), 'a 大于 b',这两条语句都会执行,从运行结果可以看出,程序返回了这两条语句的返回值组成的元组。由于 print() 函数没有返回值,相当于它的返回值是...
循环语句:while 和 for-in 跳转语句:break、continue 和 return 一、顺序结构 在任何编程语言中最常见的程序结构就是顺序结构。顺序结构就是程序从上到下一行行地执行,中间没有任何判断和跳转。 如果Python 程序的多行代码之间没有任何流程控制语句,则程序总是从上往下依次执行,排在前面的语句先执行,排在后面的语...
discount =0# GBPprint(order_total, discount)# ternary operatordiscount =25iforder_total >100else0print(order_total, discount) 对于这种简单情况,我发现能够用一行代码来表达逻辑非常好,而不是用四行。记住,作为编码人员,您花在阅读代码上的时间要比编写代码多得多,因此 Python 的简洁性是无价的。
a if condition else b ref: https://stackoverflow.com/questions/394809/does-python-have-a-ternary-conditional-operator