Python while 关键字Python 关键字实例只要 x 小于 9,就打印 x:x = 0while x < 9: print(x) x = x + 1完整实例:x = 0while x < 9: print(x) x = x + 1定义和用法while 关
Python try 关键字Python 关键字实例尝试一段代码,并确定如果引发错误该怎么办:try: x > 3except: print("Something went wrong")完整实例:# (x > 3) will raise an error b
Python True 关键字Python 关键字实例打印比较 “8大于7” 的结果:print(8 > 7)完整实例:print(8 > 7)定义和用法True 关键字是一个布尔值,是比较运算的结果。True
Python return 关键字Python 关键字实例退出函数并返回总和:def myfunction(): return 5+5print(myfunction())完整实例:def myfunction(): return 5+5print(myfunction())
Python raise 关键字Python 关键字实例如果 x 小于 0,则引发错误并停止程序:x = -1if x < 0: raise Exception("Sorry, no numbers below zero")完整实例:x = -1if x < 0: ra
Python pass 关键字Python 关键字实例为未来的代码创建一个占位符:for x in [0, 1, 2]: pass完整实例:for x in [0, 1, 2]: pass# having an empty for loop like this, wou
Python or 关键字Python 关键字实例如果语句之一为 True,则返回 True:x = (5 > 3 or 5 > 10)print(x)完整实例:x = (5 > 3 or 5 > 10)print(x)定义和用法or 关键字是逻辑运算符
Python not 关键字Python 关键字实例如果语句不是 True,则返回 True:x = Falseprint(not x)完整实例:x = Falseprint(not x)定义和用法not 关键字是逻辑运算符。如果语句不是 T
Python nonlocal 关键字Python 关键字实例在函数内部创建一个函数,该函数使用变量 x 作为非局部变量:def myfunc1(): x = "Bill" def myfunc2(): nonlocal x x = "hel
Python None 关键字Python 关键字实例赋值 None 给一个变量:x = Noneprint(x)完整实例:x = Noneprint(x)定义和用法None 关键字用于定义 null 值,或根本没有值。None 与 0、Fal
Python lambda 关键字Python 关键字实例创建一个函数,将发送的任意数字加 10:x = lambda a : a + 10print(x(5))完整实例:x = lambda a : a + 10print(x(5))定义和用法lambda
Python is 关键字Python 关键字实例检查两个对象是否为相同对象:x = ["apple", "banana", "cherry"]y = xprint(x is y)完整实例:x = ["apple", "banana", "cherry"]y = xprin
Python in 关键字Python 关键字实例检查列表中是否存在 "banana":fruits = ["apple", "banana", "cherry"]if "banana" in fruits: print("yes")完整实例:fruits = ["apple",
Python import 关键字Python 关键字实例导入 datetime 模块并显示当前日期和时间:import datetimex = datetime.datetime.now()print(x)完整实例:import datetimex = datetime
Python if 关键字Python 关键字实例如果 x 大于 5 则打印 "YES":x = 9if x > 5: print("YES")完整实例:x = 9if x > 5: print("YES")定义和用法if 关键字用于创建条件语句(if