| assertDictEqual(self, d1, d2, msg=None) | | assertEqual(self, first, second, msg=None) | Fail if the two objects are unequal as determined by the '==' | operator. | | assertEquals = assertEqual(self, first, second, msg=None) | | assertFalse(self, expr, msg=None) | Check...
def isspace(self): # real signature unknown; restored from __doc__ """ S.isspace() -> bool Return True if all characters in S are whitespace and there is at least one character in S, False otherwise. (如果在字符串中所有字符串都是空格,则返回True) """ return False 1. 2. 3. 4....
| Return True if all cased characters in S are uppercase and there is | at least one cased character in S, False otherwise. | | join(...) | S.join(iterable) -> str | | Return a string which is the concatenation of the strings in the | iterable. The separator between elements is...
False or True # => True 在Python底层,True和False其实是1和0,所以如果我们执行以下操作,是不会报错的,但是在逻辑上毫无意义。 # True and False are actually 1 and 0 but with different keywords True + True # => 2 True * 8 # => 8 False - 5 # => -5 我们用==判断相等的操作,可以看出...
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...
| | (i.e. all elements that are in this set but not the others.) | | intersection(...) | Return the intersection of two sets as a new set. | | (i.e. all elements that are in both sets.) | | isdisjoint(...) | Return True if two sets have a null intersection. | | ...
suffix can also be a tuple of strings to try. """ return False def expandtabs(self, tabsize=None): """ 将tab转换成空格,默认一个tab转换成8个空格 """ """ S.expandtabs([tabsize]) -> string Return a copy of S where all tab characters are expanded using spaces. If tabsize is not...
如果更改people,cats和dogs的初始值会发生什么?因为你正在比较数字,如果更改数字,不同的if 语句将评估为True,并且其下的代码块将运行。回去放入不同的数字,看看你是否能在脑海中弄清楚哪些代码块将运行。 将我的答案与你的答案进行比较,并确保你真正理解代码“块”的概念。这对于你做下一个练习很重要,其中你将编...
True >>> 4.强制2个字符串指向同一个对象 sys中的intern方法强制两个字符串指向同一个对象 '''sys中的intern方法强制两个字符串指向同一个对象''' import sys a = 'abc%' b = 'abc%' print(a is b) # True a = sys.intern(b) print(id(a), id(b)) # 2989905230512 2989905230512 ...
The .assertNotEqual() method works similarly but with the opposite logic. To illustrate how the .assertTrue() and .assertFalse() methods work, say that you have the following function: Python prime_v1.py import math def is_prime(number): if number <= 1: return False for i in range...