=运算符判断它是否不等于0。如果不等于0,就输出The string is not equal to zero.,否则输出The string is equal to zero.。 示例 下面是一个完整的例子,演示了如何使用Python判断一个字符串不等于0: s=input("Please enter a string: ")ifs!="0":print("The string is not equal to zero.")else:prin...
请注意,"if not x:"语句只检查x是否为假值(如0、False、None、空字符串等),而不会检查x是否具有其中一种特定类型的值。如果您想检查x是否为一些特定值,可以使用等于(==)运算符。例如: ```python x = "Hello" if x == "Hello": print("x is equal to Hello") else: print("x is not equal to...
foo=long_function_name(var_one,var_two,var_three,var_four) 当if语句的条件部分足够长,需要跨多行编写时,值得注意的是,两个字符的关键字(即 if),加上一个空格,再加上一个开括号,会为多行条件的后续行创建一个自然的4个空格缩进。这可能会在if语句内嵌的缩进代码块的可视上产生冲突,后者也会自然地缩进...
Python一般有三种断言函数:1.基本的布尔断言函数(assertEqual、assertNotEqual、assertTrue等)。2.比较断言(assertAlmostEqual、assertNotAlmostEqualassertGreater等)。3.复杂断言(assertListEqual、assertTupleEqual等),这些断言函数的常用应用有:状态断言、json断言、list断言、jsonpath断言、assert_that断言、post_xml断言、...
--判断是否不为None:obj is not None unittest所有断言方法 1.下面是unittest框架支持的所有断言方法,有兴趣的同学可以慢慢看。 | assertAlmostEqual(self, first, second, places=None, msg=None, delta=None) | Fail if the two objects are unequal as determined by their ...
代码运行次数:0 运行 AI代码解释 1Too many cats!The world is doomed!2The world is dry!3People are greater than or equal to dogs.4People are less than or equal to dogs.5People are dogs. dis()它 在接下来的几个练习中,我希望你运行dis()在你正在学习的一些代码上,以便更深入地了解它是如何...
这段代码会输出x is not equal to 0和x is not equal to an empty string,因为None与整数0和空字符串不相等。 None的使用场景 None在Python中常被用于表示一个缺失的值或者一个空的对象。它可以用来初始化变量,以及作为默认参数值。当我们不确定某个变量的初始值时,可以将其赋值为None。例如: ...
if__name__ =='__main__': parser = argparse.ArgumentParser( description=__description__, epilog="Developed by {} on {}".format(", ".join(__authors__), __date__) ) parser.add_argument('EVIDENCE_FILE',help="Path to evidence file") ...
当该模块被当做执行脚本时,__name__为__main__( A module’s __name__ is set equal to '_...
List/tuple must be of length equal to the number of columns. float_format : one-parameter function, optional, default None Formatter function to apply to columns' elements if they are floats. This function must return a unicode string and will be applied only to the non-``NaN`` elements...