function Format(const Format: string; const Args: array of const): string; overload; 事实上Format方法有两个种形式,另外一种是三个参数的,主要区别在于它是线程安全的, 但并不多用,所以这里只对第一个介绍: function Format(const Format: string; const Args: array of const): string; overload; For...
return 'Test str function.' def __repr__(self): return 'Test repr function.' def __ascii__(self): return 'Test ascii function.' print('str: {t!s}, repr: {t!r}, ascii: {t!a}'.format(t=Test())) # Ouput str: Test str function., repr: Test repr function., ascii: Test ...
字符串的下标索引是从0开始的,所以a_string[0:2]会返回原字符串的前两个元素,从a_string[0]开始,直到但不包括a_string[2]。 如果省略了第一个索引值,Python会默认它的值为0。所以a_string[:18]跟a_string[0:18]的效果是一样的,因为从0开始是被Python默认的。 同样地,如果第2个索引值是原字符串的长...
print("s.find() = {function}".format(function = s.find('a')))print("s.find() = {function}".format(function = s.find('ab')))print("s.find() = {function}".format(function = s.find('f')))print("s.find() = {function}".format(function = s.find('b',-8,-5)))print("...
ascii_letters：'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'ascii_lowercase：'abcdefghijklmnopqrstuvwxyz'ascii_uppercase：'ABCDEFGHIJKLMNOPQRSTUVWXYZ'capwords：<function capwords at 0x000001CCBCA76160>digits：'0123456789'hexdigits：'0123456789abcdefABCDEF'octdigits：'01234567'printable：'0123456789abcdef...
Since Python 3.0, theformatfunction was introduced to provide advance formatting options. print(f'{name} is {age} years old') Python f-strings are available since Python 3.6. The string has thefprefix and uses{}to evaluate variables.
def functionname(parameters): “函数_文档字符串” function_suite return [expression] 2.对象创建 在python 中,类型属于对象,变量是没有类型的: a=[1,2,3] #赋值后这个对象就已经创建好了 a=“Runoob” 以上代码中,[1,2,3] 是List 类型,“Runoob” 是String 类型,而变量a 是没有类型,她仅仅是一个...
classTest(object):def__str__(self):return'Test str function.'def__repr__(self):return'Test repr function.'def__ascii__(self):return'Test ascii function.'print('str: {t!s}, repr: {t!r}, ascii: {t!a}'.format(t=Test()))# Ouputstr:Teststrfunction.,repr:Testreprfunction.,ascii...
multi_line_str = '''This is a multi-line string.''' doc_string = """A docstring for function: def some_function(): pass""" 2.3 str() 函数 虽然通常不需要,但也可以用 str() 函数将其他类型转换为字符串。 integer_to_string = str(42) # 输出:'42' float_to_string = str(3.14) #...
>>>''.join([a,b,c])'Ilovepython'>>>' '.join([a,b,c])'I love python'>>>'*'.join([a,b,c])'I*love*python'>>>'*'.join((a,b,c))'I*love*python'.format方式: >>> help(''.format)Helpon built-infunctionformat:format(...) method of builtins.str instance ...