\$ 美元符 dollar sign 定义模板字符串的参数 template-strings import string teaInfo={'ID':'0818','Name':'Jack','Age':21,'Addr':'Beijing'} t = string.Template("【学号】: $ID\n【姓名】: $Name\n【年龄】:${Age}岁\n【地址】:$Addr")
f-string 是 Python 3.6 加入的字符串格式化功能，也是现在比较推崇的格式化方法。操作方式为「f」后跟...
原始字符串(raw string)是所有的字符串都是直接按照字面的意思来使用,没有转义特殊或不能打印的字符,通常简称为 r-string。 如果没有转义字符,原始字符串和普通字符串是一样的,比如 print('hello')print(r'hello') hello hello 如果有转义字符(...
F-strings are the clear winner in terms of readability. However, they don’t allow you to do lazy interpolation. There’s no way to use an f-string to create a reusable string template that you can interpolate later in your code. Additionally, you can’t use a dictionary to provide the...
>>> def validate_length(string): ... if (n := len(string)) < 8: ... print(f"Length {n} is too short, needs at least 8") ... else: ... print(f"Length {n} is okay!") ... >>> validate_length("Pythonista") Length 10 is okay! >>> validate_length("Python") Le...
The caret (^)matches a pattern only at the beginning of the string The dollar ($) matches the regular expression pattern at the end of the string When this flag is specified, the pattern character^matches at the beginning of the string and each newline’s start (\n). And the metachara...
美元符号(Variable substitution[Dollar sign])。 \1. 作为变量的前导符,用作变量替换,即引用一个变量的内容,比如:echo $PATH; \2. 在正则表达式中被定义为行末(End of line)。 17. ${}-变量 参数替换(Variable substitution)。 用于在字符串中表示变量。
str1 ="Emma is a Python developer \nEmma also knows ML and AI"# dollar sign($) to match at the end of the stringresult = re.search(r"\w{2}$", str1) print(result.group())# Output 'AI' Run Regex*asterisk/star metacharacter ...
'42 7.03 string chess' >>>’{2} {0} {1}’.format(f,s,n) # 新式格式化可指定插入的顺序 0,1,2:参数的位置 ’42 7.03 string chess’ >>> d={‘n’:42,’f’:7.03,’s’:’string cheese’} >>> ‘{0[n]} {0[f]} {0[s]} {1}’.format(d,’other’) # {0}代表整个字典,...
url =f'{config.authorize_url}?oauth_token={req_token.oauth_token}'returnrender_template('index.html', link=url) 我们读取配置文件并将其传递给get_oauth_token函数。这个函数将用oauth_token的值填充全局变量req_token;我们需要这个令牌来开始授权过程。然后我们使用从配置文件中获取的authorize_url值和OAuth...